CN113186476A - Hot galvanizing process method for coil-type scaffold - Google Patents
Hot galvanizing process method for coil-type scaffold Download PDFInfo
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- CN113186476A CN113186476A CN202110479177.4A CN202110479177A CN113186476A CN 113186476 A CN113186476 A CN 113186476A CN 202110479177 A CN202110479177 A CN 202110479177A CN 113186476 A CN113186476 A CN 113186476A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000005246 galvanizing Methods 0.000 title claims abstract description 57
- 238000005554 pickling Methods 0.000 claims abstract description 137
- 238000007747 plating Methods 0.000 claims abstract description 69
- 239000011701 zinc Substances 0.000 claims abstract description 50
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 50
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 49
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000005406 washing Methods 0.000 claims abstract description 16
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 15
- 239000011592 zinc chloride Substances 0.000 claims abstract description 15
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 9
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001448 ferrous ion Inorganic materials 0.000 claims abstract description 4
- 238000002161 passivation Methods 0.000 claims description 18
- 239000003595 mist Substances 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000002918 waste heat Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000008237 rinsing water Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 230000000694 effects Effects 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 238000000137 annealing Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 150000002505 iron Chemical class 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 101100165177 Caenorhabditis elegans bath-15 gene Proteins 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- -1 iron ion Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 235000019614 sour taste Nutrition 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a hot galvanizing process method for a coil-fastener type scaffold. The method comprises the following process steps: (1): fastening and hanging a workpiece; (2): acid washing: the pickling solution in the pickling tank is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃; (3): washing with water; (4): plating assistance: the mass ratio of zinc chloride to ammonium chloride in the plating assistant solution is 1.2-1.6: 1, the PH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant groove is 60-70 ℃; (5): hot galvanizing: the temperature of the zinc liquid in the zinc plating tank is 435-; (6): cooling; (7): passivating; (8) repairing materials; (9): and (3) refluxing the tool, and returning the hot galvanized tool hanger to a deplating tank for deplating, wherein the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%.
Description
Technical Field
The invention relates to a hot galvanizing process method for a coil-fastener type scaffold.
Background
The hot dip galvanizing is one of the most effective means for delaying the environmental corrosion of steel materials, and is to dip the steel products with their surfaces cleaned and activated into molten zinc liquid, and to plate a zinc alloy coating with good adhesion on the steel products through the reaction and diffusion between iron and zinc. Compared with other metal protection methods, the hot-dip galvanizing process has incomparable advantages in the protection characteristic of the combination of the physical barrier and the electrochemical protection of the plating layer, the bonding strength of the plating layer and the substrate, the compactness, the durability, the maintenance-free property and the economical efficiency of the plating layer and the adaptability of the plating layer to the shape and the size of a product.
At present, hot-dip galvanized products mainly comprise steel pipes, steel plates, steel strips, steel wires and the like, wherein the proportion of the hot-dip galvanized steel pipes to the hot-dip galvanized steel plates is large. The disk-type scaffold is a scaffold for buildings which is widely applied at present, and the production execution standard (JG/T503-.
The existing hot galvanizing process for steel plates, steel pipes and the like generally has the defects of low production efficiency, low production capacity, poor uniformity of a galvanized layer, poor durability and the like, and can not meet the hot galvanizing production of the coil buckle type scaffold.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the hot galvanizing process method for the coil button type scaffold, which has high production efficiency, high production capacity, good uniformity of a zinc coating and good durability.
The invention is realized by the following technical scheme: a hot galvanizing process method for a coil-buckled scaffold is characterized by comprising the following steps: the method comprises the following process steps:
step (1): the black parts are fastened and hung through a tool hanger and then conveyed to the upper part of a feed chute by a travelling crane, and workpieces are conveyed to a pretreatment area through a chain type conveying system;
step (2): acid washing: conveying the workpiece forwards in a stepping manner through a lifting and walking system to pass through a plurality of pickling tanks for pickling treatment so as to remove rust and dirt on the surface of the workpiece, wherein pickling solution in the pickling tanks is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃;
and (3): washing with water: conveying the pickled workpiece step by step through a hoisting walking system to pass through a rinsing bath for rinsing;
and (4): plating assistance: continuously conveying the washed workpiece into a plating assisting tank for plating assisting through a hoisting and walking system in a stepping manner, wherein the plating assisting solution in the plating assisting tank is zinc chloride and ammonium chloride, and the mass ratio of the zinc chloride to the ammonium chloride in the plating assisting solution is 1.2-1.6: 1, the PH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant groove is 60-70 ℃;
and (5): hot galvanizing: after being fastened for the second time, the plating-assistant workpiece is conveyed to a galvanizing bath filled with zinc liquid through a ring rail for galvanizing, the temperature of the zinc liquid in the galvanizing bath is 435-;
and (6): and (3) cooling: conveying the galvanized workpiece to a pure water cooling tank through a ring rail for cooling, wherein the temperature of the pure water cooling tank is not higher than 60 ℃;
and (7): passivation: conveying the cooled workpiece into a passivation tank through a ring rail for passivation treatment, wherein a passivator in the passivation tank is a chromium-free passivator;
and (8): conveying the passivated workpiece to a material repairing process through a ring rail for material repairing, and then conveying the repaired workpiece to a package for packaging;
and (9): the tool is refluxed, and the hot galvanized tool hanger is returned to a deplating tank for deplating so as to remove a galvanized layer on the surface of the tool hanger; the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%.
In the invention, the process steps of acid washing, water washing, plating assisting and the like all adopt step-by-step conveying, so that the production efficiency can be greatly improved. The workpiece can effectively remove rust, dirt and the like on the surface of the workpiece through acid washing, and the adhesiveness of a zinc coating is facilitated. The mass ratio of zinc chloride to ammonium chloride in the plating assistant solution adopted in the invention is 1.2-1.6: 1, under the proportion, zinc chloride and ammonium chloride can generate better plating assisting effect through complementation, and salt film formed on the surface of a workpiece has better thermal stability, thereby being beneficial to improving the quality of a subsequent zinc coating. When the content of iron salt in the plating assistant liquid exceeds the standard, the quality of zinc liquid can be influenced, the production of zinc ash and zinc slag can be improved, the zinc consumption is increased, and the quality of a zinc coating is reduced: the iron salt is carried into the zinc liquid along with the assistant plating double salt film and reacts with the zinc liquid, about 20 percent of iron enters the zinc coating (hemp grains or small particles), and the rest 80 percent of iron directly enters the zinc slag. The temperature of the plating assistant solution in the plating assistant tank is controlled to be 60-70 ℃, the temperature of the workpiece can be increased, the temperature difference between the workpiece and the zinc solution is reduced, and zinc explosion is prevented. In the invention, the main functions of adding aluminum into the zinc liquid are to improve the gloss of a hot dip galvanized layer and reduce the oxidation of the surface of a zinc bath, and the functions of adding nickel into the zinc liquid are to improve the fluidity and reduce the zinc consumption. The stripping solution in the stripping tank adopts hydrochloric acid with the mass percentage concentration of 10-12%, and the galvanized hanger can be subjected to zinc stripping treatment on the premise of reducing iron reaction to the maximum extent.
Furthermore, pickling is carried out in a partition stepping mode during pickling, all pickling tanks are sequentially arranged along the conveying direction of the workpiece and are sequentially divided into three pickling areas, each pickling area is provided with at least two pickling tanks, a common pickling tank is arranged between every two adjacent pickling areas, the mass percentage concentration of pickling solution in the pickling tank of the first area is 6% -10%, the mass percentage concentration of pickling solution in the pickling tank of the second area is 13% -16%, and the mass percentage concentration of pickling solution in the pickling tank of the third area is 18% -20%. Through the partitioned stepping pickling, the workpiece can be sufficiently pickled in each pickling area, the pickling effect is improved, the workpiece waiting time can be reduced through the partitioned stepping pickling, the production process is smoother, the production efficiency can be greatly improved, and the equipment production capacity is improved.
Furthermore, in order to ensure the pickling effect and the production efficiency, the pickling time of each workpiece in a pickling tank in a pickling area is 8-15 minutes.
Furthermore, 10-11 pickling tanks are used for ensuring the pickling effect and the production efficiency; the rinsing baths are two rinsing baths which are sequentially arranged along the conveying direction of the workpiece, the two rinsing baths are used one by one, when the PH value of rinsing water in the rinsing baths is lower than 3, the rinsing bath is stopped, and the other rinsing bath is replaced to finish water washing.
Furthermore, a pre-zinc-stripping tank is arranged between the rinsing tank and the plating assisting tank, and the stripping liquid in the pre-zinc-stripping tank is hydrochloric acid with the mass percentage concentration of 10% -12%. Through setting up the zinc groove of moving back in advance, can get rid of the zinc that adheres to in the environment on the frock hanger, avoid the zinc that adheres to on the frock hanger to get into subsequent process, produce adverse effect to the galvanizing coat, influence hot-galvanize effect.
Further, in order to ensure that the factory area has no sour taste and no zinc smoke during production, the steps 1 to 4 are all completed in a totally closed negative pressure pickling room.
Further, in order to ensure that the acid mist generated in the production process can reach the discharge standard, the acid mist in the negative-pressure pickling room is captured and treated by primary water and secondary alkali liquor of an acid mist absorption tower, so that HCL is less than or equal to 100mg/m3。
Furthermore, in order to reduce energy consumption, the plating assisting tank is heated by tail gas of a combustion system of the galvanizing tank.
Furthermore, in order to reduce energy consumption, the pickling bath is heated by tail gas of a combustion system of the galvanizing bath and/or waste heat of cooling water.
The invention has the beneficial effects that: the method of the invention is adopted to carry out hot galvanizing on the disk-type scaffold, the bonding strength of the plating layer and the matrix is high, the compactness of the plating layer is good, the uniformity and the durability of the zinc plating layer are good, the appearance effect is good, and the service life of the disk-type scaffold can be prolonged. The process steps of pickling, washing, plating assisting and the like in the invention all adopt step-by-step conveying, so that the production efficiency can be greatly improved, the production capacity can be improved, particularly, the partitioned step-by-step pickling is adopted, the waiting time of workpieces can be reduced, the production process is smoother, and the production efficiency is greatly improved.
Drawings
FIG. 1 is a process flow diagram of the present invention in an embodiment;
FIG. 2 is a schematic illustration of a zone step pickling process according to the present invention in an embodiment;
FIG. 3 is a schematic view (front half) of the apparatus arrangement of the present invention in a specific embodiment;
FIG. 4 is a schematic view (second half) of the apparatus arrangement of the present invention in a specific embodiment;
in the figure, 1, a travelling crane, 2, a feeding tank, 3, a negative pressure pickling room, 4, an acid mist absorption tower, 5, iron salt removing equipment, 6, a pickling tank, 7, a rinsing tank, 8, a pre-annealing zinc tank, 9, a plating assisting tank, 10, a pickling tool hanger return track, 11, pickling tool hanger transmission equipment, 12, a hoisting travelling system, 13, a small travelling crane, 14, a travelling crane, 15, a galvanizing tank, 16, a pure water cooling tank, 17, a passivation tank, 18, a circular track, 19, dust removing equipment, 20, a cooling tower, 21, an annealing tank, 22, a travelling crane, 23 and a travelling crane.
Detailed Description
The invention will now be further illustrated by way of non-limiting examples in conjunction with the accompanying drawings:
FIG. 1 is a process flow chart of the present invention, FIG. 2 is a schematic view of a sectional step pickling process, and FIGS. 3 and 4 are equipment layout views of a hot galvanizing process for a coil scaffold according to the present invention.
A hot galvanizing process method for a coil-fastener type scaffold comprises the following process steps:
step (1): and (4) after the black part is fastened and hung by a tool hanger, the black part is conveyed to the upper part of the feeding chute by a travelling crane, and the workpiece is conveyed to a pretreatment area by a chain type conveying system. And selecting a proper tool hanger according to the size and the shape of the workpiece and a bundling method to hang the black piece on the hanging bar.
Step (2): acid washing: the workpiece is conveyed forwards in a stepping mode through a lifting and walking system and then passes through a plurality of pickling tanks for automatic pickling treatment, and the purpose of removing rust and dirt on the surface of the workpiece is achieved. The pickling solution in the pickling tank is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃. The lifting walking system can be an electric hoist, and the workpiece is conveyed forwards in a stepping mode through the lifting walking system.
And (3): washing with water: and conveying the pickled workpiece by a hoisting walking system step by step to pass through a rinsing bath for rinsing.
And (4): plating assistance: continuously conveying the washed workpiece into a plating assisting tank for plating assisting through a hoisting and walking system in a stepping manner, wherein the plating assisting solution in the plating assisting tank is zinc chloride and ammonium chloride, and the mass ratio of the zinc chloride to the ammonium chloride in the plating assisting solution is 1.2-1.6: 1, the PH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant tank is 60-70 ℃.
And (5): hot galvanizing: and after secondary hanging, the plating-assistant workpiece is conveyed to a galvanizing bath filled with zinc liquid through a ring rail for galvanizing, wherein the temperature of the zinc liquid in the galvanizing bath is 435-.
And (6): and (3) cooling: and conveying the galvanized workpiece to a pure water cooling tank through a ring rail for cooling, wherein the temperature of the pure water cooling tank is not higher than 60 ℃.
And (7): passivation: and conveying the cooled workpiece into a passivation tank through a ring rail for passivation treatment, wherein a passivator in the passivation tank is a chromium-free passivator which does not contain chromium and is an environment-friendly material.
And (8): conveying the passivated workpiece to a material repairing process through a ring rail for material repairing, and then conveying the repaired workpiece to a package for packaging.
And (9): the tool is refluxed, and the hot galvanized tool hanger is returned to a deplating tank for deplating so as to remove a galvanized layer on the surface of the tool hanger; the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%. The pickled tool hanger can directly flow back to the initial position, the surface of the tool hanger subjected to hot galvanizing along with a workpiece is provided with a zinc coating, the zinc stripping treatment is required, the part of the tool hanger is conveyed into a stripping tank through a ring rail for stripping, and iron can react in a large amount while zinc on the tool hanger reacts with acid liquor in the stripping process. The comparative experiment can prove the effect of the deplating solution adopted by the invention: the tool hanger to be de-galvanized is placed in the de-plating solution to be soaked, when the concentration (3%) of the de-plating solution meets the requirement of entering a zinc chloride regeneration system, the de-plating solution is detected, wherein the iron ion content is about 20g/L, and the zinc content reaches 300 g/L. The hanger to be subjected to zinc stripping is placed in a stripping solution (hydrochloric acid with the mass percentage concentration of 20%) with the common proportioning concentration for soaking, and when the concentration (3%) of the stripping solution accords with that of the solution entering a zinc chloride regeneration system, the stripping solution is detected, wherein the iron ion content is about 50 g/L. Therefore, compared with the deplating solution with the common proportioning concentration, the deplating solution has good effect of removing and collecting zinc on the surface of the hanger and has relatively weak reaction with iron.
Meanwhile, because the iron content in the acid liquor is low, the deplating liquid can be used for regenerating zinc chloride and supplementing the zinc chloride in the plating bath, so that the production cost can be saved, and the economic benefit of an enterprise can be improved. Generally, when the concentration of the deplating solution (3%) is consistent with that of entering a zinc chloride regeneration system, the deplating solution can be used for regenerating zinc chloride.
In the pickling step of the present invention, when the stepwise pickling is adopted, the pickling may be performed one by one according to the configuration of the pickling tank, but in view of the production efficiency, the production capacity, and the pickling effect, it is preferable that: the pickling process comprises the steps of pickling according to a zone stepping mode, wherein all pickling tanks are sequentially arranged along the conveying direction of a workpiece and are sequentially divided into three pickling zones, each pickling zone is provided with at least two pickling tanks, a common pickling tank is arranged between every two adjacent pickling zones, the mass percentage concentration of pickling solution in the pickling tank of the first zone is 6-10%, the mass percentage concentration of pickling solution in the pickling tank of the second zone is 13-16%, and the mass percentage concentration of pickling solution in the pickling tank of the third zone is 18-20%. The number of pickling tanks is 10-11, and the pickling time of each workpiece in the pickling tank in one pickling area is 8-15 minutes. As shown in FIG. 2, the 11 pickling tanks are divided into three groups, the 1# -3# pickling tank is the first zone, the 5# -7# pickling tank is the second zone, the 9# -11# pickling tank is the third zone, and the 4# pickling tank and the 8# pickling tank are used as the common pickling tank. During the zonal pickling, when the feeding material is loaded: the hoisting walking system hoists the workpiece from the station No. 1 to any station of the station No. 3-5, the workpiece is placed in a pickling tank for 8-15 minutes, and after the time reaches the set time, the workpiece in the corresponding tank is hoisted to the station No. 6 for pickling waiting; when the No. 6 station has materials: the hoisting walking system hoists the workpiece to any station of the stations 7-9 from the station 6, the workpiece is placed in a pickling tank for 8-15 minutes, and after the time reaches the set time, the workpiece in the corresponding tank is hoisted to the station 10 for pickling waiting; when the No. 10 station has materials: the lifting walking system lifts the workpiece from the station No. 10 to any station of the station No. 11 to 13, the workpiece is placed in the pickling tank for 8 to 15 minutes, and when the time reaches the set time, the lifting walking system lifts the workpiece to the next station. Through the partitioned stepping pickling, the workpiece can be sufficiently pickled in each pickling area, the pickling effect is improved, the workpiece waiting time can be reduced through the partitioned stepping pickling, the production process is smoother, the production efficiency can be greatly improved, and the equipment production capacity is improved.
In order to improve the production efficiency, the invention preferably selects two rinsing baths which are sequentially arranged along the conveying direction of the workpiece, the two rinsing baths are used one by one, when the PH value of rinsing water in the rinsing baths is lower than 3, the rinsing baths are stopped, and the other rinsing bath is replaced to finish water washing.
When the tool hanger runs in a factory environment, zinc can be attached to the surface of the tool hanger, and when the zinc attached to the tool hanger enters a subsequent hot galvanizing process, the zinc can have adverse effects on a zinc coating of a workpiece, so that the hot galvanizing effect is influenced. In order to effectively remove zinc attached to the surface of the hanger, a pre-zinc-stripping groove is arranged between a rinsing groove and a plating assisting groove, and a stripping solution in the pre-zinc-stripping groove is hydrochloric acid with the mass percentage concentration of 10% -12%.
In order to ensure that the factory area has no sour taste and no zinc smoke during production, the invention preferably completes the steps 1 to 4 in a totally closed negative pressure pickling room.
In order to ensure that the acid mist generated in the production process can reach the standard and be discharged, preferably, the acid mist in the negative-pressure pickling room is captured and treated by primary water and secondary alkali liquor of an acid mist absorption tower, so that HCL is less than or equal to 100mg/m3。
In order to reduce energy consumption, the plating assisting tank is preferably heated by tail gas of a combustion system of the galvanizing tank, and the pickling tank is preferably heated by the tail gas of the combustion system of the galvanizing tank and/or waste heat of cooling water.
As shown in fig. 3-4, the equipment adopted by the process method comprises: the traveling crane comprises a feeding tank 2, a negative-pressure pickling room 3, a pickling tank 6, a rinsing tank 7, a pre-annealing zinc tank 8, a plating assisting tank 9, a pickling tool hanger return track 10, pickling tool hanger transmission equipment 11, a hoisting traveling system 12, a galvanizing tank 15, a pure water cooling tank 16, a passivation tank 17, a circular track 18, a plating removing tank 21, an acid mist absorption tower 4, deironing salt equipment 5, dedusting equipment 19 and a cooling tower 20 which are sequentially arranged in the negative-pressure pickling room 3 according to the workpiece conveying direction. Wherein, a black material hanging area is arranged below the travelling crane 1, and the areas of the feed chute 2 and the negative pressure pickling room 3 are pretreatment areas. The feed chute 2 is arranged at the front part of the negative pressure pickling room 3, and a chain type conveying system for conveying workpieces is arranged at the position of the feed chute 2. The hoisting travelling system 12 is arranged in the negative-pressure pickling room 3 and is positioned above the pickling tank 6, the rinsing tank 7, the pre-annealing zinc tank 8 and the plating assisting tank 9, and the hoisting travelling system 12 is poweredA movable hoist. The pickling tool hanger return track 10 is arranged on the outer side of the negative-pressure pickling room 3 and used for returning the pickling tool hanger. The pickling tool hanger transmission equipment 11 is correspondingly arranged below the pickling tool hanger return track 10 and used for conveying the pickling tool hanger, and the pickling tool hanger can be hung and unloaded through the small travelling crane 13 when returning. Each pickling tank 6 is provided with acid liquor heating equipment, preferably tail gas and/or cooling water waste heat of a combustion system of the galvanizing tank are/is adopted for heating, and steam is adopted for heating when the temperature is insufficient. The plating assisting tank 9 is provided with heating equipment, preferably tail gas of a combustion system of the galvanizing tank is used for heating, and steam is used for heating when the temperature is insufficient. The tail gas and the cooling water waste heat of the galvanizing tank combustion system are used for heating, so that the waste heat can be effectively utilized, and the energy consumption is reduced. The acid mist absorption tower 4 and the deironing salt equipment 5 are arranged outside the negative-pressure pickling room 3, the acid mist absorption tower 4 is communicated with the negative-pressure pickling room 3, the acid mist absorption tower 4 is in the prior art, and acid mist in the negative-pressure pickling room can be captured and treated by primary water and secondary alkali liquor of the acid mist absorption tower, so that HCL is less than or equal to 100mg/m3. And the workpiece subjected to acid washing and plating assisting enters a secondary fastening region for fastening. The galvanizing tank 15, the pure water cooling tank 16, and the passivation tank 17 are provided in this order in the workpiece conveying direction. The circular rail 18 passes through the upper part of the galvanizing bath 15, the pure water cooling bath 16, the passivation bath 17 and the deplating bath 21. The secondarily hung workpiece is conveyed into a galvanizing tank 15 through a ring rail 18 for hot galvanizing, then conveyed into a pure water cooling tank through the ring rail 18 for cooling, then conveyed into a passivation tank 17 through the ring rail 18 for passivation treatment, then conveyed to a material repairing process through the ring rail 18 for material repairing, and the workpiece entering a material repairing area is lifted through a traveling crane 22. And conveying the hot galvanized tool hanger to a de-plating tank through a ring rail to perform de-zinc treatment. The galvanizing bath 15 is heated by a galvanizing bath combustion system which is combusted by natural gas. The smoke generated by hot galvanizing is treated by dust removing equipment 19. The cooling water system of the cooling step is treated by a cooling tower 20.
Other parts in this embodiment are the prior art, and are not described herein again.
Claims (9)
1. A hot galvanizing process method for a coil-buckled scaffold is characterized by comprising the following steps: the method comprises the following process steps:
step (1): the black parts are fastened and hung through a tool hanger and then conveyed to the upper part of a feed chute by a travelling crane, and workpieces are conveyed to a pretreatment area through a chain type conveying system;
step (2): acid washing: conveying the workpiece forwards in a stepping manner through a lifting and walking system to pass through a plurality of pickling tanks for pickling treatment so as to remove rust and dirt on the surface of the workpiece, wherein pickling solution in the pickling tanks is hydrochloric acid with the mass percentage concentration of 6-20%, and the temperature of the pickling solution is 15-20 ℃;
and (3): washing with water: conveying the pickled workpiece step by step through a hoisting walking system to pass through a rinsing bath for rinsing;
and (4): plating assistance: continuously conveying the washed workpiece into a plating assisting tank for plating assisting through a hoisting and walking system in a stepping manner, wherein the plating assisting solution in the plating assisting tank is zinc chloride and ammonium chloride, and the mass ratio of the zinc chloride to the ammonium chloride in the plating assisting solution is 1.2-1.6: 1, the PH value of the plating assistant solution is 3.5-4.5; the ferrous ion content in the plating assistant solution is less than or equal to 1 g/L; the temperature of the plating assistant liquid in the plating assistant groove is 60-70 ℃;
and (5): hot galvanizing: after being fastened for the second time, the plating-assistant workpiece is conveyed to a galvanizing bath filled with zinc liquid through a ring rail for galvanizing, the temperature of the zinc liquid in the galvanizing bath is 435-;
and (6): and (3) cooling: conveying the galvanized workpiece to a pure water cooling tank through a ring rail for cooling, wherein the temperature of the pure water cooling tank is not higher than 60 ℃;
and (7): passivation: conveying the cooled workpiece into a passivation tank through a ring rail for passivation treatment, wherein a passivator in the passivation tank is a chromium-free passivator;
and (8): conveying the passivated workpiece to a material repairing process through a ring rail for material repairing, and then conveying the repaired workpiece to a package for packaging;
and (9): the tool is refluxed, and the hot galvanized tool hanger is returned to a deplating tank for deplating so as to remove a galvanized layer on the surface of the tool hanger; the deplating liquid in the deplating tank is hydrochloric acid with the mass percentage concentration of 10-12%.
2. The hot galvanizing process method for the disc scaffold according to claim 1, which is characterized in that: the pickling process comprises the steps of pickling according to a zone stepping mode, wherein all pickling tanks are sequentially arranged along the conveying direction of a workpiece and are sequentially divided into three pickling zones, each pickling zone is provided with at least two pickling tanks, a common pickling tank is arranged between every two adjacent pickling zones, the mass percentage concentration of pickling solution in the pickling tank of the first zone is 6-10%, the mass percentage concentration of pickling solution in the pickling tank of the second zone is 13-16%, and the mass percentage concentration of pickling solution in the pickling tank of the third zone is 18-20%.
3. The hot galvanizing process method for the disc scaffold according to claim 2, which is characterized in that: the pickling time of each workpiece in the pickling tank in one pickling area is 8-15 minutes.
4. The hot galvanizing process for the disc scaffold according to claim 3, which is characterized in that: 10-11 pickling tanks; the rinsing baths are two rinsing baths which are sequentially arranged along the conveying direction of the workpiece, the two rinsing baths are used one by one, when the PH value of rinsing water in the rinsing baths is lower than 3, the rinsing bath is stopped, and the other rinsing bath is replaced to finish water washing.
5. The hot galvanizing process method for the disc scaffold according to claim 2, which is characterized in that: a pre-zinc-stripping tank is arranged between the rinsing tank and the plating assisting tank, and the stripping liquid in the pre-zinc-stripping tank is hydrochloric acid with the mass percentage concentration of 10% -12%.
6. The hot galvanizing process for the disc scaffold according to the claim 1, 2, 3, 4 or 5, wherein: the steps 1 to 4 are all completed in a totally closed negative pressure pickling room.
7. According to claim6 the hot galvanizing process method of the disk-fastener type scaffold is characterized in that: acid mist in the negative pressure pickling room is captured and treated by primary water and secondary alkali liquor of an acid mist absorption tower to ensure that HCL is less than or equal to 100mg/m3。
8. The hot galvanizing process method for the disc scaffold according to claim 6, which is characterized in that: the plating assisting tank is heated by tail gas of a combustion system of the galvanizing tank.
9. The hot galvanizing process method for the disc scaffold according to claim 6, which is characterized in that: the pickling tank is heated by tail gas of a combustion system of the galvanizing tank and/or waste heat of cooling water.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114672752A (en) * | 2022-05-30 | 2022-06-28 | 山西建龙实业有限公司 | Method for improving weld quality of high-strength welded pipe for disc-buckle type scaffold |
| CN114790534A (en) * | 2022-05-09 | 2022-07-26 | 唐山衡康实业有限公司 | Hot galvanizing process method for coil-type scaffold |
| CN115247248A (en) * | 2021-12-10 | 2022-10-28 | 徐州瑞马智能技术有限公司 | Hot galvanizing automatic treatment process based on online detection system |
| CN115725919A (en) * | 2021-09-01 | 2023-03-03 | 常熟风范电力设备股份有限公司 | Method for controlling zinc in acid-containing wastewater in workpiece hot galvanizing process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001226789A (en) * | 2000-02-15 | 2001-08-21 | Nippon Steel Corp | Manufacturing method of high-strength hot-dip galvanized steel sheet |
| JP2004091856A (en) * | 2002-08-30 | 2004-03-25 | Sumitomo Metal Ind Ltd | Method for producing pickled steel sheet and pickling apparatus |
| CN101135017A (en) * | 2007-07-09 | 2008-03-05 | 株洲冶炼集团股份有限公司 | Hot-dip galvanizing alumino-nickel for steel component hot-dip galvanizing and ingot shape and method thereof |
| CN102400075A (en) * | 2011-11-23 | 2012-04-04 | 河北卓亿线路器材有限公司 | L-shaped full-closed environment-friendly hot galvanizing production equipment and method |
| CN202430291U (en) * | 2011-12-30 | 2012-09-12 | 河北卓亿线路器材有限公司 | Stepwise automatic acid plant used in hot galvanizing production process |
| CN111304570A (en) * | 2020-04-26 | 2020-06-19 | 徐州瑞马科宝金属制品有限公司 | A high degree of automation of hot-dip galvanizing production process |
-
2021
- 2021-04-30 CN CN202110479177.4A patent/CN113186476B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001226789A (en) * | 2000-02-15 | 2001-08-21 | Nippon Steel Corp | Manufacturing method of high-strength hot-dip galvanized steel sheet |
| JP2004091856A (en) * | 2002-08-30 | 2004-03-25 | Sumitomo Metal Ind Ltd | Method for producing pickled steel sheet and pickling apparatus |
| CN101135017A (en) * | 2007-07-09 | 2008-03-05 | 株洲冶炼集团股份有限公司 | Hot-dip galvanizing alumino-nickel for steel component hot-dip galvanizing and ingot shape and method thereof |
| CN102400075A (en) * | 2011-11-23 | 2012-04-04 | 河北卓亿线路器材有限公司 | L-shaped full-closed environment-friendly hot galvanizing production equipment and method |
| CN202430291U (en) * | 2011-12-30 | 2012-09-12 | 河北卓亿线路器材有限公司 | Stepwise automatic acid plant used in hot galvanizing production process |
| CN111304570A (en) * | 2020-04-26 | 2020-06-19 | 徐州瑞马科宝金属制品有限公司 | A high degree of automation of hot-dip galvanizing production process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115725919A (en) * | 2021-09-01 | 2023-03-03 | 常熟风范电力设备股份有限公司 | Method for controlling zinc in acid-containing wastewater in workpiece hot galvanizing process |
| CN115247248A (en) * | 2021-12-10 | 2022-10-28 | 徐州瑞马智能技术有限公司 | Hot galvanizing automatic treatment process based on online detection system |
| CN114790534A (en) * | 2022-05-09 | 2022-07-26 | 唐山衡康实业有限公司 | Hot galvanizing process method for coil-type scaffold |
| CN114672752A (en) * | 2022-05-30 | 2022-06-28 | 山西建龙实业有限公司 | Method for improving weld quality of high-strength welded pipe for disc-buckle type scaffold |
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