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A high-strength fastener high-corrosion electroplating process

An electroplating process and fastener technology, which is applied in the field of high-strength fasteners and high-corrosion electroplating process, can solve the problems of high maintenance cost and short service life, and can solve the problems of velcro, high surface hardness and eliminating the influence of hydrogen embrittlement. Effect

Active Publication Date: 2021-02-19
湖南纳菲尔新材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, due to the harsher environment in seawater, on the other hand, when it acts on fasteners, it must ensure the corrosion resistance function under the limited coating thickness. Therefore, the current pure tungsten alloy plating still cannot meet the anti-corrosion requirements in the marine environment. , there are still problems of short service life and high maintenance cost

Method used

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  • A high-strength fastener high-corrosion electroplating process
  • A high-strength fastener high-corrosion electroplating process
  • A high-strength fastener high-corrosion electroplating process

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Experimental program
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Effect test

Embodiment 1

[0037] Fastener tungsten alloy plating, material: 8.8 grade ML35 steel

[0038] ①Pickling and derusting

[0039] Preparation of pickling solution: add half a tank of pure water, then slowly add half a tank of 36% hydrochloric acid, stir evenly, and constant volume.

[0040] The soaking derusting temperature is 25°C, and the time is 5 minutes. After derusting, tap water is washed 3 times.

[0041] ②Chemical degreasing

[0042] Prepare 30g / L sodium hydroxide solution: add half a tank of pure water, then add the calculated amount of sodium hydroxide, stir to dissolve, and finally add water to the use range.

[0043] The degreasing temperature is 50°C, and the time is 20 min. After degreasing, tap water is washed 3 times.

[0044] ③Electropolishing

[0045] Preparation of electropolishing solution: Add one-third of the tank of pure water, then add 400g / L phosphoric acid and 500g / L sulfuric acid in turn, stir well, then slowly add pure water to the range of use, cool to room temp...

Embodiment 2

[0062] Firmware tungsten alloy plating, material: 12.9 grade 35CrMo

[0063] ① Phosphoric acid derusting

[0064] Preparation of pickling solution: add half a tank of pure water, then slowly add half a tank of 85% phosphoric acid, and stir evenly.

[0065] The rust removal temperature is 20-35°C, and the time is 15 minutes. After rust removal, tap water is washed 3 times.

[0066] ②Chemical degreasing

[0067] Prepare 40g / L sodium hydroxide solution: add half a tank of pure water, then add the calculated amount of sodium hydroxide, stir to dissolve, and finally add pure water to the use range.

[0068] The degreasing temperature is 70°C, the time is 30min, and the tap water is washed 3 times after degreasing.

[0069] ③Electropolishing

[0070] Preparation of electropolishing solution: Add one-third of the tank of pure water, then add 500g / L phosphoric acid and 400g / L sulfuric acid in turn, after stirring evenly, add pure water to the range of use and cool down, then add 0...

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Abstract

The invention provides a high-strength fastener high anti-corrosion electroplating process; the high anti-corrosion electroplating process means that the surface of the pre-treated fastener is sequentially plated with a tungsten alloy inner layer, a nickel middle layer, layer and the outer layer of tungsten alloy, first of all, use the excellent compactness and bonding force of the tungsten alloy coating to reduce the porosity of the coating, play the role of isolating and protecting the carbon steel substrate, and improve the bonding strength of the coating; take advantage of the excellent deep plating ability , The semi-bright nickel plating layer with high corrosion potential is used as the middle layer to provide electrochemical protection, and then the outer layer of electroplated tungsten alloy is used to improve the corrosion resistance and wear resistance of the surface; after electroplating, the hydrogen embrittlement effect of the process is eliminated and the process is improved Surface hardness and sealing process further improve corrosion resistance. The electroplated fastener of the present invention has a resistance to neutral salt spray test of 800 hours, grade 10; there is no hydrogen embrittlement phenomenon, and the surface hardness of the electroplated fastener is high, and has good anti-collision and disassembly damage characteristics.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a high-strength fastener high-corrosion electroplating process. Background technique [0002] The marine environment is a very corrosive and harsh natural environment. Seawater is a highly corrosive electrolyte solution that contains a large amount of salts, including sodium chloride and salts containing elements such as potassium, bromine, and iodine. Oxygen, nitrogen, carbon dioxide and other gases are dissolved in seawater. The high temperature, high humidity, high salt content of water vapor and strong ultraviolet rays on the islands are harsh climate conditions, which lead to various fasteners on steel structures or equipment. , severe corrosion occurs. In addition to advanced anti-corrosion materials, surface anti-corrosion treatment is the most economical and effective means of protection in the marine field. Surface treatment technologies include org...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/12C25D3/12C25D3/56C25D5/34C25D5/48C25F3/16C23F11/08
CPCC23F11/08C25D3/12C25D3/56C25D3/562C25D5/12C25D5/34C25D5/48C25F3/16
Inventor 张长科雷同鑫鞠辉王二立
Owner 湖南纳菲尔新材料科技股份有限公司
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