Method for improving corrosion resistance of nickel-phosphorus chemical coating

A technology of chemical plating and corrosion resistance, which is applied in the direction of liquid chemical plating, coating, metal material coating process, etc., and can solve the problems of corrosion resistance decline and other problems

Inactive Publication Date: 2014-09-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of corrosion resistance drop caused by pores in current electroless nickel plating, and proposes a method for improving the corrosion resistance of nickel-phosphorus electroless plating

Method used

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  • Method for improving corrosion resistance of nickel-phosphorus chemical coating
  • Method for improving corrosion resistance of nickel-phosphorus chemical coating
  • Method for improving corrosion resistance of nickel-phosphorus chemical coating

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Electroless nickel-phosphorus plating on the surface of clean carbon steel substrate, plating solution formula for electroless nickel-phosphorus plating: nickel sulfate 25g / L, sodium hypophosphite 20g / L, sodium acetate 5g / L, sodium citrate 5g / L, Methyltetrahydroxyphthalic anhydride 1.5g / L, pH 4-5; bath temperature 85°C, electroless plating time 10 minutes;

[0031] (2) Put the nickel-phosphorus-plated substrate into the copper plating solution to replace copper plating. Copper plating solution: copper sulfate 20g / L, 20% dilute sulfuric acid 10g / L, 2-mercaptobenzothiazole 10mg / L, benzene ethylenediaminetetraacetic acid 2g / L; the bath temperature is 30 degrees Celsius, and the electroless plating time is 30 minutes;

[0032] (3) The substrate after copper plating is electroless-plated nickel-phosphorus again, and the plating solution formula for electroless nickel-plating phosphorus is: nickel sulfate 25g / L, sodium hypophosphite 20g / L, sodium acetate 5g / L, sodium citr...

Embodiment 2

[0035] (1) Electroless nickel-phosphorus plating on the surface of clean carbon steel substrate, plating solution formula for electroless nickel-phosphorus plating: nickel sulfate 25g / L, sodium hypophosphite 20g / L, sodium citrate 15g / L, citric acid 5g / L, Succinic acid 5g / L, malic acid 25g / L, pH 4-5; bath temperature 90°C, electroless plating time 5 minutes;

[0036](2) Put the nickel-phosphorus-plated substrate into the copper plating solution to replace copper plating. Copper plating solution: copper sulfate 20g / L, 20% dilute sulfuric acid 10g / L, 2-mercaptobenzothiazole 10mg / L, benzene ethylenediaminetetraacetic acid 2g / L; the bath temperature is 40 degrees Celsius, and the electroless plating time is 20 minutes;

[0037] (3) The substrate after copper plating is electroless nickel-phosphorous again, and the plating solution formula for electroless nickel-plating phosphorus is: nickel sulfate 25g / L, sodium hypophosphite 20g / L, sodium citrate 15g / L, citric acid 5g / L, amber Ac...

Embodiment approach

[0041] (1) Perform alkaline electroless nickel-phosphorus plating on the surface of a clean carbon steel substrate, and the plating solution formula for electroless nickel-plating phosphorus: nickel sulfate 25g / L, sodium hypophosphite 25g / L, sodium pyrophosphate 50g / L, thiourea 2mg / L, lead nitrate 1mg / L, pH value 10; bath temperature is 70°C, electroless plating time is 5 minutes;

[0042] (2) Put the nickel-phosphorus-plated substrate into the copper plating solution to replace copper plating. Copper plating solution: copper sulfate 30g / L, 20% dilute sulfuric acid 15g / L, 2-mercaptobenzothiazole 10mg / L, benzene ethylenediaminetetraacetic acid 2g / L; the bath temperature is 25 degrees Celsius, and the electroless plating time is 30 minutes;

[0043] (3) The substrate after copper plating is electroless nickel-phosphorous again, and the plating solution formula for electroless nickel-plating phosphorus: nickel sulfate 25g / L, sodium hypophosphite 25g / L, sodium pyrophosphate 50g / L...

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Abstract

The invention relates to a method for improving corrosion resistance of a nickel-phosphorus chemical coating. The method comprises the following steps: plating a thin layer of nickel and phosphorus on the surface of a carbon steel substrate, and plating a layer of copper using a chemical exchange method; and then plating a layer of nickel and phosphorus. According to the invention, chemical copper plating is adopted for sealing holes and improving corrosion potential; in the process of the primary nickel and phosphorus plating, nickel and phosphorus are plated on most of the carbon steel substrate, so that the possibility that lower bonding strength of the coating is caused by reaction between copper and iron in a large amount during the secondary copper plating step is reduced, thereby ensuring the bonding strength of the coating. The method is suitable for occasions that the corrosion resistance of the coating is reduced due to small thickness and high porosity of the coating. By using the method, the corrosion resistance effect can be greatly improved under the condition that the thin coating is obtained.

Description

technical field [0001] The invention relates to a method for improving corrosion resistance, in particular to a method for improving the corrosion resistance of a nickel-phosphorus electroless coating, and belongs to the technical field of Ni-P amorphous material coating anti-corrosion technology. Background technique [0002] Electroless nickel plating is a method that uses the principle of electrochemical reaction to plate nickel alloy on the substrate. Due to the well-known advantages of this coating, electroless plating technology is widely used in the commercial field today. These advantages include high wear resistance, corrosion resistance, good smooth flatness, and excellent thickness uniformity even in unevenness. Electroless plating technology is considered to be one of the simplest and most economical methods to protect iron, aluminum, magnesium and other metals from corrosion. But the nickel-phosphorus coating usually only plays a role of physical isolation. B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/32
Inventor 邹勇栾涛徐扬郝玉林
Owner SHANDONG UNIV
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