CN109047774B - Hole sealing method for injection molding stainless steel product - Google Patents
Hole sealing method for injection molding stainless steel product Download PDFInfo
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- CN109047774B CN109047774B CN201810958032.0A CN201810958032A CN109047774B CN 109047774 B CN109047774 B CN 109047774B CN 201810958032 A CN201810958032 A CN 201810958032A CN 109047774 B CN109047774 B CN 109047774B
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- steel product
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- 238000007789 sealing Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 24
- 239000010935 stainless steel Substances 0.000 title claims abstract description 24
- 238000001746 injection moulding Methods 0.000 title abstract description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 36
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 18
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000005011 phenolic resin Substances 0.000 claims abstract description 10
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 10
- 229920002545 silicone oil Polymers 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000007598 dipping method Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 2
- 239000000243 solution Substances 0.000 abstract description 21
- 238000000576 coating method Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004663 powder metallurgy Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007822 coupling agent Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical compound [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- ZYBWTEQKHIADDQ-UHFFFAOYSA-N ethanol;methanol Chemical compound OC.CCO ZYBWTEQKHIADDQ-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
- B22F2003/242—Coating
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
- Sealing Material Composition (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a hole sealing method for an injection molding stainless steel product, which adopts a hole sealing solution consisting of the following substances in parts by weight: 100 parts of No. 190 solvent oil, 15-25 parts of phenolic resin, 5-8 parts of thiourea, 15-20 parts of silane coupling agent, 1-5 parts of silicone oil, 8-13 parts of ethylene glycol and 3-10 parts of N-methyl-N- (trimethylsilane) trifluoroacetamide. The invention can significantly improve the corrosion resistance, greatly reduce the interface surface energy and improve the bonding force between the hole sealing layer and the functional coating.
Description
Technical Field
The invention relates to the technical field of functional coatings, in particular to a hole sealing method for a stainless steel product.
Background
The metal powder injection molding technology is a new revolution of the manufacturing technology industry, and integrates the multi-disciplinary transparent and crossed products of plastic molding technology, polymer chemistry, powder metallurgy technology, metal material science and the like, a blank can be injected and molded by using a mold, a structural part with high density, high precision and three-dimensional complex shape can be rapidly manufactured by sintering, the design idea can be rapidly and accurately materialized into a product with certain structure and functional characteristics, the part can be directly produced in batch. The process technology not only has the advantages of less working procedures, no cutting or less cutting, high economic benefit and the like of the conventional powder metallurgy process, but also overcomes the defects of uneven material, low mechanical property, difficult thin wall forming and complex structure of the traditional powder metallurgy process product, and is particularly suitable for mass production of small and complex metal parts with special requirements.
However, since the metal powder and the binder are firstly combined, gaps are left between the metal particles after molding, and the gaps have great influence on the mechanical property and the corrosion resistance of the product. For this reason, a corrosion-resistant oxide film layer is generally formed outside the molded product, and the oxide film layer is further subjected to a sealing treatment to improve corrosion resistance. CN105598456A is a previously developed technology of the applicant, which is a sealing treatment with a silane coupling agent after a steam oxidation treatment. Although the hole sealing treatment improves the corrosion resistance, various functional coatings are required to be coated at the later stage of the stainless steel product, the hole sealing mode causes the anti-stripping performance between the stainless steel base material and the functional coatings to be poor, and the functional coatings are easy to fall off and damage due to the action of interface stress.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a hole sealing method for an injection-molded stainless steel product, which can improve the corrosion resistance of the stainless steel, improve the anti-friction performance of the product and improve the mechanical performance parameters.
In order to solve the above problems, the present invention provides the following technical solutions:
a hole sealing method for an injection molding stainless steel product comprises the following steps:
(1) firstly, carrying out steam oxidation treatment on an injection-molded stainless steel product to form a compact oxide layer of 10-50 microns;
(2) preparing a hole sealing solution, wherein the hole sealing solution comprises the following substances in parts by weight: 100 parts of No. 190 solvent oil, 15-25 parts of phenolic resin, 5-8 parts of thiourea, 15-20 parts of silane coupling agent, 1-5 parts of silicone oil, 8-13 parts of ethylene glycol and 3-10 parts of N-methyl-N- (trimethylsilane) trifluoroacetamide;
(3) dipping the stainless steel product obtained in the step (1) in a hole sealing solution, controlling the temperature to be 30-35 ℃ and the dipping time to be 3-5 hours;
(4) taking out the stainless steel product, drying and curing.
Further, the temperature of the steam oxidation treatment in the step (1) is controlled at 235-250 ℃.
Further, pouring the phenolic resin, the thiourea, the silane coupling agent, the silicone oil and the ethylene glycol into No. 190 solvent oil, fully stirring for 15-30 minutes, adding N-methyl-N- (trimethylsilane) trifluoroacetamide for modification, and continuously stirring for 15-30 minutes.
Further, the ratio of ethylene glycol to N-methyl-N- (trimethylsilane) trifluoroacetamide was 2: 1.
Further, the hole sealing solution comprises the following substances in parts by weight: 100 parts of No. 190 solvent oil, 18-20 parts of phenolic resin, 5.5-6.5 parts of thiourea, 15-18 parts of silane coupling agent, 2-3 parts of silicone oil, 10-12 parts of ethylene glycol and 5-6 parts of N-methyl-N- (trimethylsilane) trifluoroacetamide.
Further, in the step (3), the temperature was controlled to 34 ℃ and the dipping time was 4.5 hours.
Further, the curing temperature is 120 ℃ and the curing time is 3-4 hours.
Further, after curing, the thickness of the hole sealing layer is 3-4 microns.
According to the hole sealing method for the injection-molded stainless steel product, provided by the invention, the hole sealing treatment is carried out on the injection-molded stainless steel product by selecting the formula of the specific components, so that the corrosion resistance of the injection-molded stainless steel product can be obviously improved. Meanwhile, after the hole sealing solution after modification treatment is adopted for treatment, the hole sealing layer contains a large number of active groups, and after other functional coatings are coated subsequently, the interfacial surface energy can be greatly reduced, the binding force between the hole sealing layer and the functional coatings is improved, the outermost functional coatings are ensured not to fall off easily, and the service life of the product is prolonged. In addition, the method has simple process steps and low energy consumption, and greatly reduces the production cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
A hole sealing method for an injection molding stainless steel product comprises the following steps:
(1) firstly, carrying out steam oxidation treatment on an injection-molded stainless steel product to form a compact oxide layer of 10-50 microns;
(2) preparing a hole sealing solution, wherein the hole sealing solution comprises the following substances in parts by weight: 100 parts of No. 190 solvent oil, 18 parts of phenolic resin, 7 parts of thiourea, 18 parts of silane coupling agent, 3.5 parts of silicone oil, 10 parts of ethylene glycol and 8 parts of N-methyl-N- (trimethylsilane) trifluoroacetamide; firstly, pouring phenolic resin, thiourea, a silane coupling agent, silicone oil and ethylene glycol into No. 190 solvent oil, fully stirring for 30 minutes, then adding N-methyl-N- (trimethylsilane) trifluoroacetamide for modification, and continuously stirring for 20 minutes.
(3) Dipping the stainless steel product obtained in the step (1) in a hole sealing solution, controlling the temperature to be 34 ℃ and the dipping time to be 4.5 hours;
(4) taking out the stainless steel product, drying and curing at 120 deg.c for 3 hr. After curing, the thickness of the orifice layer was 4 microns.
The test parameters for this example are shown in table 1.
Example 2
The hole sealing solution comprises the following substances in parts by weight: 100 parts of No. 190 solvent oil, 19 parts of phenolic resin, 6 parts of thiourea, 15.5 parts of silane coupling agent, 2.5 parts of silicone oil, 10 parts of ethylene glycol and 3.5 parts of N-methyl-N- (trimethylsilane) trifluoroacetamide. The other process steps are the same as in example 1.
The test parameters for this example are shown in table 1.
Example 3
The hole sealing solution comprises the following substances in parts by weight: 100 parts of No. 190 solvent oil, 19 parts of phenolic resin, 6 parts of thiourea, 15.5 parts of silane coupling agent, 2.5 parts of silicone oil, 10 parts of ethylene glycol and 5 parts of N-methyl-N- (trimethylsilane) trifluoroacetamide. The other process steps are the same as example 2.
Comparative example 1
The water solution of the silane coupling agent is used as a hole sealing solution, the silane coupling agent is prepared from an aminosilane coupling agent and a vinyl silane coupling agent, and the weight ratio of the aminosilane coupling agent to the vinyl silane coupling agent is (5): 1. preparing a hydrolysis solution: adding 60ml of ethanol-methanol (volume ratio is 5: 1) mixed solution into 180ml of deionized water, placing the mixture on a magnetic stirrer, uniformly stirring, adding 60ml of the silane coupling agent, and uniformly stirring; dropwise adding acetic acid to adjust the pH value of the solution to 4.6, and uniformly mixing the solution by adopting ultrasonic oscillation for 30 min; the solution was allowed to stand at room temperature for 20 hours to prepare 300ml of a 20% silane coupling agent-containing hydrolysis solution. The other process steps are the same as example 2.
Examples 1-3 and comparative example 1 were subjected to the following respective tests.
The test is carried out by referring to the Chinese national standard GB/T10125-1997 artificial atmosphere corrosion test salt spray test, and the test time is selected from 24h, 48h and 72 h.
The method refers to the Chinese national standard GB/T24368-2009 glass surface hydrophobic pollutant detection contact angle measurement method for testing.
TABLE 1
The results in table 1 show that the sealing treatment of the present application provides good hydrophobicity (moisture barrier) and corrosion resistance compared to conventional silane coupling agent sealing fluids.
In order to examine the bonding strength between the stainless steel substrate and the functional coating after the hole sealing treatment, the final products of examples 1-3 and comparative example 1 were selected as the substrate, a 400 μm CrBSi ceramic layer was coated on the surface of the substrate by using the plasma spraying technique, and the tensile test was performed on the coating by using a tensile testing machine, and the ratio of the fracture force of the coating from the substrate to the area of the coating was the final bonding strength. See table 2 for specific test results.
TABLE 2
Claims (5)
1. A hole sealing method for an injection-molded stainless steel product is characterized by comprising the following steps:
(1) firstly, carrying out steam oxidation treatment on an injection-molded stainless steel product to form a compact oxide layer of 10-50 microns;
(2) preparing a hole sealing solution, wherein the hole sealing solution comprises the following substances in parts by weight: 100 parts of No. 190 solvent oil, 18-20 parts of phenolic resin, 5.5-6.5 parts of thiourea, 15-18 parts of silane coupling agent, 2-3 parts of silicone oil, 10-12 parts of ethylene glycol and 5-6 parts of N-methyl-N- (trimethylsilane) trifluoroacetamide; wherein the ratio of ethylene glycol to N-methyl-N- (trimethylsilane) trifluoroacetamide is 2: 1;
(3) dipping the stainless steel product obtained in the step (1) in a hole sealing solution, controlling the temperature to be 30-35 ℃ and the dipping time to be 3-5 hours;
(4) taking out the stainless steel product, drying and curing; after curing, the thickness of the hole-sealing layer is 3-4 microns.
2. The method for sealing holes according to claim 1, wherein the temperature of the steam oxidation treatment in the step (1) is controlled to be 235-250 ℃.
3. The hole sealing method according to claim 1, wherein the phenolic resin, thiourea, the silane coupling agent, the silicone oil and the ethylene glycol are poured into No. 190 solvent oil and fully stirred for 15-30 minutes, then N-methyl-N- (trimethylsilane) trifluoroacetamide is added for modification, and stirring is continued for 15-30 minutes.
4. The method of sealing pores according to claim 1, wherein in the step (3), the temperature is controlled to 34 ℃ and the dipping time is 4.5 hours.
5. The method for sealing pores according to claim 1, wherein the curing temperature is 120 ℃ and the curing time is 3 to 4 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810958032.0A CN109047774B (en) | 2018-08-22 | 2018-08-22 | Hole sealing method for injection molding stainless steel product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810958032.0A CN109047774B (en) | 2018-08-22 | 2018-08-22 | Hole sealing method for injection molding stainless steel product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109047774A CN109047774A (en) | 2018-12-21 |
| CN109047774B true CN109047774B (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810958032.0A Active CN109047774B (en) | 2018-08-22 | 2018-08-22 | Hole sealing method for injection molding stainless steel product |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003183791A (en) * | 2001-12-18 | 2003-07-03 | Yanmar Co Ltd | Abrasion resistant sliding member |
| CN1869086A (en) * | 2005-05-27 | 2006-11-29 | 德古萨公司 | Copolymers, method for the production thereof, and use thereof as binders |
| CN105598456A (en) * | 2015-09-18 | 2016-05-25 | 扬州海昌粉末冶金有限公司 | Method for sealing hole of injection-molding stainless steel product in silanization way and water solution formula and application of silane coupling agent |
| CN106318286A (en) * | 2016-08-18 | 2017-01-11 | 阜南县明强柳编工艺品有限公司 | Adhesive for fracture surface of connection position of rattans, and preparation method of adhesive |
-
2018
- 2018-08-22 CN CN201810958032.0A patent/CN109047774B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003183791A (en) * | 2001-12-18 | 2003-07-03 | Yanmar Co Ltd | Abrasion resistant sliding member |
| CN1869086A (en) * | 2005-05-27 | 2006-11-29 | 德古萨公司 | Copolymers, method for the production thereof, and use thereof as binders |
| CN105598456A (en) * | 2015-09-18 | 2016-05-25 | 扬州海昌粉末冶金有限公司 | Method for sealing hole of injection-molding stainless steel product in silanization way and water solution formula and application of silane coupling agent |
| CN106318286A (en) * | 2016-08-18 | 2017-01-11 | 阜南县明强柳编工艺品有限公司 | Adhesive for fracture surface of connection position of rattans, and preparation method of adhesive |
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| CN109047774A (en) | 2018-12-21 |
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