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Electroplating solution and electroplating layer production process of high corrosion-resistant nano-nickel plus non-crack micro-hard chromium composite coating

A composite electroplating and production process technology, which is applied in the production process of high corrosion-resistant nano-nickel plus crack-free microhard chromium composite electroplating layer, can solve the problems of poor deep plating ability, poor corrosion resistance, low current efficiency, etc.

Active Publication Date: 2016-02-10
YANTAI XINGHUI AVIATION HYDRAULIC MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its corrosion resistance has been poor. Even nickel-chromium plating can only achieve neutral salt spray for about 200 hours, which is far from meeting the requirements of high corrosion resistance occasions such as offshore drilling platforms and pesticide spraying machinery (neutral salt spray time ≥ 1000 hours) hours) as needed
At the same time, the process and performance of electroplating hard chrome coatings still have inherent shortcomings such as low current efficiency and poor deep plating ability.

Method used

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  • Electroplating solution and electroplating layer production process of high corrosion-resistant nano-nickel plus non-crack micro-hard chromium composite coating
  • Electroplating solution and electroplating layer production process of high corrosion-resistant nano-nickel plus non-crack micro-hard chromium composite coating
  • Electroplating solution and electroplating layer production process of high corrosion-resistant nano-nickel plus non-crack micro-hard chromium composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The production process of high-corrosion-resistant nano-nickel plus crack-free micro-hard chromium composite electroplating layer includes the following process steps:

[0060] Step 1: Prepare electroplating nanocrystalline nickel primer plating solution

[0061] The raw material components and content in the bottoming electroplating solution of every liter of electroplating nano crystal nickel are as follows:

[0062] Nickel sulfamate 380ml;

[0063] Nickel chloride 5.7g;

[0064] Boric acid 30g;

[0065] High-speed nickel sulfamate HS additive 1.3ml;

[0066] High Speed ​​Nickel Sulfamate HS Wetting Agent 1ml.

[0067] Step 2: Prepare electroplating solution for crack-free hard chrome coating

[0068] The raw material components and content in the electroplating solution of every liter of electroplating crackless hard chrome coating are as follows:

[0069] 220g of chromic acid;

[0070] Pure sulfuric acid 2.5g;

[0071] Trivalent chromium 1g;

[0072] Hard chr...

Embodiment 2

[0092] The production process of high-corrosion-resistant nano-nickel plus crack-free micro-hard chromium composite electroplating layer includes the following process steps:

[0093] Step 1: Prepare electroplating nanocrystalline nickel primer plating solution

[0094] The raw material components and content in the bottoming electroplating solution of every liter of electroplating nano crystal nickel are as follows:

[0095] Nickel sulfamate 650ml;

[0096] Nickel chloride 14g;

[0097] Boric acid 55g;

[0098] High-speed nickel sulfamate HS additive 3ml;

[0099] High Speed ​​Nickel Sulfamate HS Wetting Agent 3ml.

[0100] Step 2: Prepare electroplating solution for crack-free hard chrome coating

[0101] The raw material components and content in the electroplating solution of every liter of electroplating crackless hard chrome coating are as follows:

[0102] 300g of chromic acid;

[0103] Pure sulfuric acid 5g;

[0104] Trivalent chromium 3g;

[0105] Hard chromi...

Embodiment 3

[0125] The production process of high-corrosion-resistant nano-nickel plus crack-free micro-hard chromium composite electroplating layer includes the following process steps:

[0126] Step 1, preparation of electroplating nanocrystalline nickel primer plating solution

[0127] The raw material components and content in the bottoming electroplating solution of every liter of electroplating nano crystal nickel are as follows:

[0128] Nickel sulfamate 550ml;

[0129] Nickel chloride 10g

[0130] Boric acid 42g;

[0131] High Speed ​​Nickel Sulfamate HS Additive 2ml,

[0132] High Speed ​​Nickel Sulfamate HS Wetting Agent 2ml.

[0133] Step 2, preparation of electroplating solution without cracks in hard chrome coating

[0134] The raw material components and content in the electroplating solution of every liter of electroplating crackless hard chromium coating are as follows:

[0135] 260g of chromic acid;

[0136] Pure sulfuric acid 3.6g;

[0137] Trivalent chromium 2g;...

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Abstract

The invention relates to a manufacturing technology of a high corrosion resistance nano nickel and crack-free micro hard chrome composite electroplated layer, and belongs to the field of electroplate liquid and electroplated layers. The composite electroplated layer manufacturing technology is characterized in that a preprocessed plated piece is placed into electroplating nanocrystal nickel bottoming electroplate liquid A first, then electroplating is conducted by connecting the plated piece to a stepped square wave positive-negative pulse high-power electroplating power supply, and a nanocrystal nickel bottoming plating layer is obtained; afterwards, the plated piece plated with the nanocrystal nickel bottoming plating layer is placed into electroplating crack-free hard chrome plating layer electroplate liquid B, electroplating is conducted by connecting the plated piece to the stepped square wave positive-negative pulse high-power electroplating power supply, a crack-free brightness micro hard chrome plating layer is arranged on the nanocrystal nickel bottoming plating layer in a plating mode, and at last the high corrosion resistance nano nickel and crack-free micro hard chrome composite plated layer is obtained. The current efficiency is high, the deposition speed is high, deep plating capacity is good, the corrosion resistance effect is good, and the friction coefficient and hard chrome plating are similar or slightly low.

Description

technical field [0001] The invention relates to a production process of a high-corrosion-resistant nano-nickel plus crack-free micro-hard chromium composite electroplating layer for replacing traditional hard chromium plating, and belongs to the technical field of electroplating solution and electroplating layer production technology. Background technique [0002] At present, hard chromium coating (thickness 30um~50um) is widely used in transmission wear-resistant, erosion-resistant components, industry and military because of its inherent high hardness (between 600-1,000VHN) and low friction coefficient (less than 0.2) field. However, its corrosion resistance has been poor. Even nickel-chromium plating can only achieve neutral salt spray for about 200 hours, which is far from meeting the requirements of high corrosion resistance occasions such as offshore drilling platforms and pesticide spraying machinery (neutral salt spray time ≥ 1000 hours) hours) as needed. At the sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/14C25D5/18
Inventor 王经国杨明
Owner YANTAI XINGHUI AVIATION HYDRAULIC MACHINERY CO LTD