CN103924189B - Screw-thread steel heat diffusion treatment method and screw-thread steel - Google Patents
Screw-thread steel heat diffusion treatment method and screw-thread steel Download PDFInfo
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- CN103924189B CN103924189B CN201410152881.9A CN201410152881A CN103924189B CN 103924189 B CN103924189 B CN 103924189B CN 201410152881 A CN201410152881 A CN 201410152881A CN 103924189 B CN103924189 B CN 103924189B
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Abstract
The present invention provides a kind of screw-thread steel heat diffusion treatment method and screw-thread steel, wherein screw-thread steel heat diffusion treatment method comprises the following steps that and loads in heat diffusion treatment container by pending screw-thread steel and heat diffusion treatment agent, described heat diffusion treatment container is heated, makes the top layer of described screw-thread steel form one layer of zinc-iron intermetallic compound；Described screw-thread steel is carried out cooling process.Screw-thread steel heat diffusion treatment method provided by the invention and screw-thread steel, pass through heat diffusion treatment, the surface of screw-thread steel forms zinc-iron intermetallic compound, and this zinc-iron intermetallic compound has superpower adhesive force, screw-thread steel is made to have good resistance to marring, impact resistance and corrosion resistance, suitable in the marine environment of chloride ion-containing, the environmental requirement that screw-thread steel is harsh can be met.
Description
Technical field
The present invention relates to aseptic technic, particularly relate to a kind of screw-thread steel heat diffusion treatment method and screw-thread steel.
Background technology
In prior art, screw-thread steel is the important component part of reinforced concrete structure, is one of the indispensable construction material of infrastructure.Typically, since the aobvious alkalescence of the media environment of inside concrete, regular screw threads steel corrosion rate in alkaline environment is non-normally low, it might even be possible to ignore；If but had enough chloride ion penetrate into inside concrete and contact with screw-thread steel, then could substantially speed up the corrosion of screw-thread steel.The mankind are more and more extensive in the development activities of marine environment in recent years, and in a large amount of chloride ion serious threats of marine environment concrete, the corrosion resistance of screw-thread steel, therefore, needs in engineer applied screw-thread steel surface is processed, strengthen corrosion resistance.
At present for the preservative treatment on screw-thread steel surface, the most widely used method is surface-coated organic coating, utilizes coating that the shielding action of Korrosionsmedium can effectively be delayed the diffusion of chloride ion.But screw-thread steel is in coating, installation and military service process, unavoidably there will be the local failure of coating, such as: during coating, dew point often occurs in the rib top of screw-thread steel；Needing between screw-thread steel during installation to carry out being coupled by the mode such as screw or welding, connection process very easily damages coating, and simultaneously sharp-pointed in cement mortar stone is likely to scratch-resistant coatings when pouring；The behaviors such as military service process peripheral boring also can destroy coating.And coating is once occur destroying, chloride ion gathers at breakage and the corrosion bringing out this place is occurred and development with the speed that is exceedingly fast.
Summary of the invention
The present invention provides a kind of screw-thread steel heat diffusion treatment method and screw-thread steel, the zinc-iron intermetallic compound that screw-thread steel surface is formed has superpower adhesive force, screw-thread steel is made to have good resistance to marring, impact resistance and corrosion resistance, it is possible to suitable in the marine environment of chloride ion-containing.
The present invention provides a kind of screw-thread steel heat diffusion treatment method, comprises the following steps that
Pending screw-thread steel and heat diffusion treatment agent are loaded in heat diffusion treatment container, described heat diffusion treatment container is heated, make the top layer of described screw-thread steel form one layer of zinc-iron intermetallic compound；
Described screw-thread steel is carried out cooling process.
The present invention also provides for a kind of screw-thread steel, and this screw-thread steel adopts screw-thread steel heat diffusion treatment method described above to process and forms.
Screw-thread steel heat diffusion treatment method provided by the invention and screw-thread steel, pass through heat diffusion treatment, the surface of screw-thread steel forms zinc-iron intermetallic compound, and this zinc-iron intermetallic compound has superpower adhesive force, screw-thread steel is made to have good resistance to marring, impact resistance and corrosion resistance, suitable in the marine environment of chloride ion-containing, the environmental requirement that screw-thread steel is harsh can be met.
Accompanying drawing explanation
The screw-thread steel heat diffusion treatment method process chart that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention provides a kind of screw-thread steel heat diffusion treatment method, as it is shown in figure 1, this screw-thread steel heat diffusion treatment method comprises the following steps that
101, pending screw-thread steel and heat diffusion treatment agent are loaded in heat diffusion treatment container, described heat diffusion treatment container is heated, make the top layer of described screw-thread steel form one layer of zinc-iron intermetallic compound.
Concrete, by pending screw-thread steel and the heat diffusion treatment agent loading heat diffusion treatment container that configure, wherein, the heat diffusion treatment agent of loading heat diffusion treatment container and volume sum is heat diffusion treatment vessel volume the 90%～95% of screw-thread steel；
Then will be equipped with the heat diffusion treatment container of screw-thread steel and heat diffusion treatment agent to be placed in heat diffusion treatment stove and heat, in heating process, upset heat diffusion treatment container, specifically can rotate heat diffusion treatment device with the rotating speed of 7～15 revs/min, make the screw-thread steel thermally equivalent in heat diffusion treatment container；Control heat time heating time in 2.0～2.5 hours, when temperature is increased to 300～420 DEG C, keep temperature constant 50-120 minute, it is preferred that when temperature is increased to 300～420 DEG C, keep temperature constant 60-90 minute.
So, screw-thread steel top layer just forms zinc-iron intermetallic compound, and this stratification compound and matrix screw-thread steel metallurgically combine, and metallurgical binding refers to atom phase counterdiffusion between the interface of two pieces metal and the combination that formed.This combination or connection status, or (or under temperature and pressure combined effect) is formed under the effect of temperature or pressure.Thus the zinc-iron intermetallic compound that screw-thread steel top layer is formed has superpower adhesive force, even if without coming off under the operating modes such as 180 degree of bendings, energetically shock, harsh weather and artificial destruction, making screw-thread steel keep the antiseptic property of excellence.
In the present embodiment, carrying out screw-thread steel adding iron oxide red powder in the heat diffusion treatment agent that heat diffusion treatment uses, iron oxide red has following effect:
(1) surface of energy activated zinc powder when heat diffusion treatment, prevents zinc particle from mutually boning simultaneously, so that the zinc-iron intermetallic compound structure that screw-thread steel surface is formed is finer and close；
(2) can be passivated zinc powder surface processing in cooling procedure, promote zinc-iron intermetallic compounds layer Surface Creation passivating film, thus improving the decay resistance of heat diffusion treatment layer, especially can improve alkali resistance corrosive nature.
Adding the last heat diffusion treatment technique of ferric oxide red powder compared with traditional handicraft, the compactness of thermal diffusion coating is strengthened and corrosion resistance improves.
102, described screw-thread steel is carried out cooling process.
After step 101 heat diffusion treatment completes, heat diffusion treatment container is cooled to less than 100 DEG C with heat diffusion treatment stove, then heat diffusion treatment container is taken out from described heat diffusion treatment stove, continue cool to temperature lower than 40 DEG C, screw-thread steel is separated with heat diffusion treatment agent.
The screw-thread steel heat diffusion treatment method that the embodiment of the present invention provides, the surface that can make screw-thread steel forms zinc-iron intermetallic compound, and this zinc-iron intermetallic compound has superpower adhesive force, screw-thread steel is made to have good resistance to marring, impact resistance and corrosion resistance, suitable in the marine environment of chloride ion-containing, the environmental requirement that screw-thread steel is harsh can be met.
The screw-thread steel heat diffusion treatment method that the embodiment of the present invention provides, also includes: preparation heat diffusion treatment agent, and zinc powder, silicon dioxide, iron oxide red powder and activator are specifically mixed by configuration heat diffusion treatment agent by preset ratio.Wherein, in zinc powder, the content of zinc is more than 98%, and iron oxide red powder is the 8%～15% of zinc powder weight, and activator is the 0.1～0.3% of heat diffusion treatment agent gross weight.
In the present embodiment, for making the surface of screw-thread steel better produce chemical reaction, to form zinc-iron intermetallic compound, it is desirable to the granularity of zinc powder is 200～300 orders；Silica particles is 40～100 orders；Iron oxide red powder particle size diameter ranges for 40nm～650nm, and wherein the mean particle diameter of iron oxide red powder is 100nm, and the particle size diameter powder volume content less than 100nm is not less than 80%；Activator particle size diameter ranges for 65nm～455nm.
For making various powder reach certain particle size, mixed powder can being ground micronization processes, specifically mixed-powder be refined milled processed 16 hours at room temperature 25 DEG C, being ground to powder size is 200～300 orders.
In the present embodiment, the activator in heat diffusion treatment agent can be selected for ammonium chloride or ammonium nitrate.
In the present embodiment, before screw-thread steel is carried out heat diffusion treatment, also include:
Screw-thread steel is carried out surface pretreatment, namely the surface of screw-thread steel is carried out oil removing, rust and washing and dried.
Concrete, can adopt Solvent degreasing, electrochemical deoiling, the machinery various modes such as oil removing or wiping oil removing that screw-thread steel surface is carried out oil removing；Surface derusting can adopt conventional chemical pickling or mechanical derusting method, as roll cast, scrub, the mechanical means such as sandblasting or shot-peening；After degreasing and rust removal, again through obtaining surface cleaning, dry screw-thread steel component after washing and drying, then carrying out heat diffusion treatment.
In the present embodiment, to screw-thread steel after screw-thread steel is carried out cooling process, also include:
Screw-thread steel is carried out surface post processing, namely the surface of screw-thread steel is processed by shot blasting, rinses, Passivation Treatment and dry process.
Specifically adopt the nitric acid of 15% that the surface of screw-thread steel is carried out chemical polishing 10～25 seconds, in order to remove black oxide or the remaining Zn powder on screw-thread steel surface, should acid be rinsed well with water immediately after polishing；It is passivated processing with chromic acid or chromatedsolution again, to improve infiltration layer corrosion resistance or surface smoothness, finally dries.
The thickness of the screw-thread steel heat diffusion treatment coating that the present embodiment is obtained is 40 microns, and hardness is 220HV, and by heat diffusion treatment, the impact strength of screw-thread steel improves, and namely fragility declines, and toughness improves.
Another embodiment of the present invention also provides for a kind of screw-thread steel, and this screw-thread steel adopts the screw-thread steel heat diffusion treatment method that any embodiment of the present invention provides to process and forms.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a screw-thread steel heat diffusion treatment method, it is characterised in that comprise the following steps that
Preparation heat diffusion treatment agent: by zinc powder, silicon dioxide, iron oxide red powder and activator by preset ratio mixing；
Pending screw-thread steel and heat diffusion treatment agent are loaded in heat diffusion treatment container, described heat diffusion treatment container is heated, make the top layer of described screw-thread steel form one layer of zinc-iron intermetallic compound；
Described screw-thread steel is carried out cooling process；
In described heat diffusion treatment agent, in described zinc powder, the content of zinc is more than 98%, and described iron oxide red powder is the 8%～15% of described zinc powder weight, and described activator is the 0.1～0.3% of described heat diffusion treatment agent weight.
2. screw-thread steel heat diffusion treatment method according to claim 1, it is characterised in that the described heat diffusion treatment agent of described preparation, also includes；
Mixed each powder is ground micronization processes.
3. screw-thread steel heat diffusion treatment method according to claim 1, it is characterised in that described zinc powder particle size is 200～300 orders；
Described silica particles is 40～100 orders；
Described iron oxide red powder particle size diameter is 40nm～650nm；
Described activator particle size diameter is 65nm～455nm.
4. screw-thread steel heat diffusion treatment method according to claim 3, it is characterised in that the mean particle diameter of described iron oxide red powder is 100nm, wherein the particle size diameter powder volume content less than 100nm is not less than 80%.
5. the heat diffusion treatment method of screw-thread steel according to claim 1, it is characterised in that described activator is ammonium chloride or ammonium nitrate.
6. the heat diffusion treatment method of screw-thread steel according to claim 1, it is characterized in that, in heat diffusion treatment process, volume sum is described heat diffusion treatment vessel volume the 90%～95% of the heat diffusion treatment agent and screw-thread steel loading described heat diffusion treatment container.
7. according to the arbitrary described screw-thread steel heat diffusion treatment method of claim 1-6, it is characterised in that described heat diffusion treatment step specifically includes:
Described screw-thread steel and described heat diffusion treatment agent are encased in described heat diffusion treatment container；
Described heat diffusion treatment container is placed in heat diffusion treatment stove and heats 2～2.5 hours, and in heating process, overturn described heat diffusion treatment container, make the screw-thread steel thermally equivalent in described heat diffusion treatment container；
When the temperature of described heat diffusion treatment container reaches 300～420 DEG C, keep described heat diffusion treatment vessel temp constant 50～120 minutes.
8. screw-thread steel heat diffusion treatment method according to claim 7, it is characterised in that described described screw-thread steel is carried out cooling process, specifically includes:
After heat diffusion treatment completes, described heat diffusion treatment container is cooled to less than 100 DEG C with described heat diffusion treatment stove；
Described heat diffusion treatment container is taken out from described heat diffusion treatment stove, continues cool to temperature lower than 40 DEG C；
Screw-thread steel is separated with heat diffusion treatment agent.
9. according to the arbitrary described screw-thread steel heat diffusion treatment method of claim 1-6, it is characterised in that before described heat diffusion treatment step, also include:
Described screw-thread steel is carried out surface pretreatment: the surface of described screw-thread steel is carried out oil removing, rust and washing and dried.
10. according to the arbitrary described screw-thread steel heat diffusion treatment method of claim 1-6, it is characterised in that after described screw-thread steel is carried out cooling process, also include:
Described screw-thread steel is carried out surface post processing: the surface of described screw-thread steel is processed by shot blasting, rinses, Passivation Treatment and dry process.
11. a screw-thread steel, it is characterised in that described screw-thread steel is processed by the arbitrary described screw-thread steel heat diffusion treatment method of claim 1-10 and forms.
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| CN106947939B (en) * | 2017-03-13 | 2018-12-07 | 北京科技大学 | A kind of method of thermal diffusion preparation corrosion resistant steel bar |
| CN110129536A (en) * | 2019-04-03 | 2019-08-16 | 如皋市福锴金属制品有限公司 | A kind of screw-thread steel and its thermal diffusion Treatment technique for processing |
| CN112391589A (en) * | 2019-08-12 | 2021-02-23 | 泰州多源合金技术有限公司 | Multicomponent alloy co-permeation formula for steel product and anti-corrosion processing technology |
| CN113897580A (en) * | 2021-09-26 | 2022-01-07 | 盐城市联鑫钢铁有限公司 | Treatment method for corrosion resistance of deformed steel bar |
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| CN2051229U (en) * | 1989-06-22 | 1990-01-17 | 申小金 | Zincize iron made fastener |
| SU1731872A1 (en) * | 1989-05-16 | 1992-05-07 | Челябинский филиал Научно-производственного объединения по технологии тракторного и сельскохозяйственного машиностроения | Compound for zincing metal products |
| US6171359B1 (en) * | 1997-03-17 | 2001-01-09 | Leonid Levinski | Powder mixture for thermal diffusion coating |
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| SU1138430A1 (en) * | 1983-07-21 | 1985-02-07 | Всесоюзный Научно-Исследовательский Институт Горной Механики Им.М.М.Федорова | Composition for zinc coating of steel parts |
| SU1731872A1 (en) * | 1989-05-16 | 1992-05-07 | Челябинский филиал Научно-производственного объединения по технологии тракторного и сельскохозяйственного машиностроения | Compound for zincing metal products |
| CN2051229U (en) * | 1989-06-22 | 1990-01-17 | 申小金 | Zincize iron made fastener |
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Denomination of invention: Heat diffusion treatment of rebar and its application Effective date of registration: 20210427 Granted publication date: 20160713 Pledgee: Tianjin Kerong Financing Guarantee Co.,Ltd. Pledgor: TIANJIN XZB TECHNOLOGY Co.,Ltd. Registration number: Y2021120000013 |
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