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A pretreatment method for electroplating or electroless plating of tungsten alloy and its application

A tungsten alloy and electroless plating technology, which is applied in the chromium plating of tungsten alloy and the pretreatment field of electroplating, can solve the problems of unqualified coating, peeling and falling off of parts, over corrosion, etc., to achieve easy control, improve bonding force, avoid The effect of overcorrosion

Active Publication Date: 2018-03-27
天津航空机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pretreatment method described in this method adopts sodium hydroxide as the degreasing solution to the degreasing process of tungsten powder, which has the disadvantage of over-corrosion, and also in the process of removing the oxide film in the coarsening and sensitization process. Problems leading to over-corrosion
[0004] W1 tungsten alloy is a difficult-to-plate material, and the existing electrolytic chrome plating technology cannot obtain a qualified coating, and the parts have peeling and peeling after chrome plating (such as figure 1 shown), in the fields of parts electroplating and electroless plating, the conformity of the coating binding force is particularly important, and the pretreatment process before electroplating or electroless plating of tungsten alloys to remove oil and oxide scale can improve the coating binding force It is very important. Therefore, it is of great significance to develop a pretreatment method that will not cause over-corrosion to the tungsten alloy substrate, the end point is easy to control, and can evenly remove the oxide film and passivation film on the surface of the tungsten alloy.

Method used

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  • A pretreatment method for electroplating or electroless plating of tungsten alloy and its application
  • A pretreatment method for electroplating or electroless plating of tungsten alloy and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A tungsten alloy chromium plating method, its technical process, solution formula and process parameters are as follows:

[0053] The process structure includes, pretreatment - strong corrosion - pre-nickel plating - chrome plating

[0054] A kind of tungsten alloy chromium plating method flow process is as follows:

[0055] The W1 tungsten electrode part is chemically degreased. The chemical treatment solution is composed of the following components: sodium carbonate 60g / L, sodium hydroxide 55g / L, sodium phosphate 60g / L, sodium silicate 6g / L, and the balance is water. The temperature of chemical degreasing is 70 ℃, and the time of chemical degreasing is 5 minutes. The oil on the surface of the parts is cleaned, and the surface state of the tungsten electrode is adjusted at the same time. The pretreated parts are immersed in a strong corrosive solution at room temperature. The volume percentage meter is composed of the following components: hydrochloric acid 96vol%, ti...

Embodiment 2

[0059] A tungsten alloy chromium plating method, its technical process, solution formula and process parameters are as follows:

[0060] The process structure includes, pretreatment - strong corrosion - pre-nickel plating - chrome plating

[0061] A tungsten alloy chrome plating method, its flow process is as follows:

[0062] The W1 tungsten electrode parts are chemically degreased. The chemical treatment solution is composed of the following components: sodium carbonate 65g / L, sodium hydroxide 65g / L, sodium phosphate 55g / L, sodium silicate 3g / L, and the balance is water. The temperature of chemical degreasing is 80 ℃, and the time of chemical degreasing is 3 minutes. The oil stain on the surface of the parts is cleaned, and the surface state of the tungsten electrode is adjusted at the same time. The pretreated parts are immersed in a strong corrosive solution at room temperature. The volume percentage meter is composed of the following components: 97vol% hydrochloric acid,...

Embodiment 3

[0066] A tungsten alloy chromium plating method, its technical process, solution formula and process parameters are as follows:

[0067] The process structure includes, pretreatment - strong corrosion - pre-nickel plating - chrome plating

[0068] A kind of tungsten alloy chromium plating method flow process is as follows:

[0069] The W1 tungsten electrode part is chemically degreased. The chemical treatment solution is composed of the following components: sodium carbonate 55g / L, sodium hydroxide 62g / L, sodium phosphate 65g / L, sodium silicate 8g / L, and the balance is water. The temperature of chemical degreasing is 60 ℃, and the time of chemical degreasing is 10 minutes. The oil stain on the surface of the parts is cleaned, and the surface state of the tungsten electrode is adjusted at the same time. The pretreated parts are immersed in a strong corrosive solution at room temperature. The volume percentage meter is composed of the following components: hydrochloric acid 95v...

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Abstract

The invention provides a pretreatment method for plating or chemically plating tungsten alloy and a chrome plating method for the tungsten alloy. According to the pretreatment method for plating or chemically plating the tungsten alloy, the pretreatment method of chemical degreasing, strong corrosion and nickel preplating is adopted, and an appropriate solution formula and technological parameters are selected; under the condition that a base body is not corroded, oil on the surface of the tungsten alloy is removed, an oxide film and a natural passive film are removed uniformly, and an excellent base body surface is obtained; in addition, a compact nickel layer is formed on the surface of the tungsten alloy through an appropriate preplating solution and technological parameters, the follow-up obtained binding force of a plating layer is increased, and the properties such as high binding force, abrasion resistance and oxidation resistance of chrome or other metal are ensured; the pretreatment method is stable, not only suitable for the chrome plating treatment of the tungsten alloy material, but also suitable for other plating pretreatment and chemical plating pretreatment of the tungsten alloy material; the plating layer is obtained after plating, and the phenomena of peeling and shedding of the plating layer are not existed.

Description

technical field [0001] The invention belongs to tungsten alloy electroplating and electroless plating technology, relates to a tungsten alloy electroplating or electroless plating pretreatment method and application thereof, in particular to a tungsten alloy electroplating pretreatment method and a tungsten alloy chromium plating method. Background technique [0002] Tungsten alloy has the advantages of high strength, high temperature resistance and good stability. It has extremely important applications in cutting-edge scientific fields such as aerospace and other industrial fields. In use, in order to improve the wear resistance and other properties of tungsten alloys, tungsten alloys are often treated with electroplating or electroless plating. The method of plating a layer of chromium on metals or some non-metals by electrolysis or chemical methods is called chromium plating. By plating hard chromium on the surface of tungsten alloys, the wear resistance of tungsten allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/18C25D5/38C25D3/04C23G1/20C23F1/26C25D3/12
CPCC23C18/1844C23F1/26C23G1/205C25D3/04C25D3/12C25D5/38
Inventor 徐涛涛陈祝桥徐超
Owner 天津航空机电有限公司