Steel fastener material double-layer protection method using surface blackening and organic coating

An organic coating, surface blackening technology, applied in metal material coating process, device for coating liquid on the surface, coating, etc. Excellent performance, the effect of solving poor corrosion resistance

Inactive Publication Date: 2019-08-23
江苏赛清科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address some surface protection methods such as electroplating, chemica

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1:

[0024] First, prepare the sample, degrease the fasteners made of steel in an alkaline degreasing solution, then wash them with a lot of water, then derust them in an acid derusting solution, wash and dry them with a lot of water.

[0025] The degreasing liquid is a mixture of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The content of each component is as follows:

[0026] Sodium hydroxide 10g / L; sodium carbonate 20g / L; trisodium phosphate 50g / L; sodium silicate 5g / L; OP-10 emulsifier 0.2g / L; the rest is water.

[0027] The rust remover is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0028] Hydrochloric acid 5g / L; nitric acid 15g / L.

[0029] Then, soak the fastener in the blackening liquid for 2 hours, the composition of the blackening liquid is as follows:

[0030] Copper sulfate 10g / L; nickel sulfate 5g / L; zinc dihydrogen phosphate 4g / L; phosphoric acid 3g / L; co...

Example Embodiment

[0036] Example 2:

[0037] First, prepare the sample, degrease the fasteners made of steel in an alkaline degreasing solution, then wash them with a lot of water, then derust them in an acid derusting solution, wash and dry them with a lot of water.

[0038] The degreasing liquid is a mixture of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The content of each component is as follows: sodium hydroxide 10g / L; sodium carbonate 50g / L; triphosphate Sodium 60g / L; sodium silicate 7g / L; OP-10 emulsifier 3g / L; the rest is water.

[0039] The rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows: hydrochloric acid 10g / L; nitric acid 10g / L.

[0040] Then, the fastener was immersed in the blackening liquid for 1.5 hours. The composition of the blackening liquid was as follows: copper sulfate 15g / L; nickel sulfate 4g / L; zinc dihydrogen phosphate 3g / L; phosphoric acid 2g / L; comple...

Example Embodiment

[0046] Example 3:

[0047] First, prepare the sample, degrease the fasteners made of steel in an alkaline degreasing solution, then wash them with a lot of water, then derust them in an acid derusting solution, wash and dry them with a lot of water.

[0048] The degreasing liquid is a mixture of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The content of each component is as follows: sodium hydroxide 10g / L; sodium carbonate 50g / L; triphosphate Sodium 60g / L; sodium silicate 7g / L; OP-10 emulsifier 3g / L; the rest is water.

[0049] The rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows: hydrochloric acid 10g / L; nitric acid 10g / L.

[0050] Then, the fastener was immersed in the blackening liquid for 3 hours. The composition of the blackening liquid was as follows: copper sulfate 14g / L; nickel sulfate 4g / L; zinc dihydrogen phosphate 4g / L; phosphoric acid 3g / L; complexi...

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PUM

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Abstract

The invention relates to a surface protection technology for steel fastener materials, in particular to a steel fastener material double-layer protection method using surface blackening and an organiccoating. The method comprises the steps: performing degreasing and rust removal on a fastener, then immersing the fastener in a blackening liquid for 10-20 minutes so as to form an oxide film layer,performing water washing, and then applying organic paint so as to form the organic coating. The problems that current electroplating, electroless plating, organic coating and other surface protectionmethods have complicated and harsh pretreatment, thick coatings, serious pollution and common anti-corrosion performance are solved. The surface treatment technology which adopts double protection ofblackening treatment and the organic coating has thin coatings, a simple process and low cost, no complicated pretreatment is required, and the neutral salt spray corrosion resistance of the coatingis improved to a large extent on the premise of ensuring excellent adhesion between the coating and a substrate.

Description

technical field [0001] The invention relates to surface protection technology of fasteners, in particular to a method applied to surface blackening treatment of steel fastener materials and double-layer protection of organic coatings. Background technique [0002] The marine environment is one of the most corrosive environments in nature, and most metal materials are not resistant to seawater, ocean and atmospheric corrosion. Many threaded fasteners exposed to the marine environment for a long time have very serious corrosion. Corrosion makes it difficult to disassemble the fasteners, reduce the connection strength, or even lose them, which causes great difficulties for the normal service and maintenance of the fasteners, and Fasteners have size issues and cannot be protected with thicker coatings. [0003] Through the analysis of fastener materials, structural characteristics, service conditions and other factors, combined with the corrosion characteristics of the marine e...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/10C09D7/61C09D127/12C09D7/65C09D133/04B05D7/14B05D7/24C23C22/12C23C22/17
CPCB05D7/14B05D7/24C08K2003/0812C08K2003/0881C08K2003/3009C09D5/10C09D5/103C09D7/61C09D7/65C09D127/12C09D133/04C09D163/00C23C22/12C23C22/17C08K3/08C08K3/30C08L27/18
Inventor 李庆鹏彭辉
Owner 江苏赛清科技有限公司
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