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Anti-corrosion post-treatment liquid for nickel coating surface and treatment process thereof

A post-treatment liquid and treatment process technology, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., to achieve the effect of simple treatment process, increased thickness, and increased compactness

Inactive Publication Date: 2013-06-05
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of insufficient corrosion resistance of thin nickel coatings in the prior art, and proposes a post-processing method that can significantly improve the corrosion resistance of nickel coatings The treatment solution and its treatment process, the present invention first uses the silane coupling agent to pretreat the nickel coating to form a layer of silane film with good bonding force on its surface, and then through the immersion treatment of the long-chain organic fatty acid emulsion, the adsorption on the The silane coupling agent on the surface of the nickel coating reacts with the long-chain organic fatty acid to form a dense mixed film on the surface of the nickel coating, which has strong hydrophobicity and corrosion resistance, and can significantly improve the corrosion resistance of the nickel coating stability without affecting the appearance and electrical performance of the workpiece

Method used

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  • Anti-corrosion post-treatment liquid for nickel coating surface and treatment process thereof
  • Anti-corrosion post-treatment liquid for nickel coating surface and treatment process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of liquid A: Slowly add 0.5mol γ-aminopropyltrimethoxysilane into 1 liter of water / butanol mixed solvent, the water / alcohol volume ratio is 1:17, hydrolyze for a period of time at room temperature;

[0030] 2. Preparation of liquid B: Dissolve 1 mmol of stearic acid in 1 L of water with sodium dodecyl sulfate, and adjust the pH of the solution to 2 with phosphoric acid;

[0031] 3. At room temperature, immerse the test board in liquid A for 30 seconds, take it out, immerse it in liquid B for 15 minutes, the temperature of liquid B is 70°C, take it out, rinse it with warm water, dry it, and test the corrosion resistance and electrical properties.

Embodiment 2

[0033] 1. Preparation of liquid A: Slowly add 0.2mol N-β(aminoethyl)-γ-aminopropyltriethoxysilane to 1 liter of water / isopropanol mixed solvent, the water / alcohol volume ratio is 2:17 , hydrolyzed for a period of time at room temperature;

[0034] 2. Preparation of liquid B: Dissolve 5mmol stearic acid in 1L water with polyethylene glycol octyl ether, adjust the pH of the solution with phosphoric acid

[0035] adjust to 3;

[0036] 3. At room temperature, immerse the test board in liquid A for 60 seconds, take it out, and immerse it in liquid B for 20 minutes. The temperature of liquid B is 60°C.

[0037] After washing with warm water, blow dry, and test the corrosion resistance and electrical properties.

Embodiment 3

[0039] 1. Preparation of liquid A: Slowly add 0.1 mol of polyaminoalkyltrialkoxysilane into 1 liter of water / butanol mixed solvent, the water / alcohol volume ratio is 1:11, and hydrolyze for a period of time at room temperature;

[0040] 2. Preparation of liquid B: Dissolve 10 mmol of stearic acid in 1 L of water with sodium dodecyl sulfate, and adjust the pH of the solution to 2.5 with acetic acid;

[0041] 3. At room temperature, immerse the test board in solution A for 45 seconds, take it out, immerse it in solution B for 30 minutes, the temperature of solution B is 50°C, take it out, rinse it with warm water, dry it, and test the corrosion resistance and electrical properties.

[0042]

[0043] Above-mentioned embodiment sample carries out relevant test data as follows:

[0044] 1. Neutral salt spray test experiment

[0045] After the nickel-plated experimental plate was processed according to the processes of Example 1, Example 2, and Example 3, the neutral salt spray te...

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Abstract

The invention relates to anti-corrosion post-treatment liquid for a nickel coating surface and a treatment process thereof. The anti-corrosion post-treatment liquid comprises two parts, namely post-treatment liquid and the treatment process, wherein the post-treatment liquid is divided into a solution A and a solution B; the solution A is a water / alcohol mixed solvent containing a silane coupling agent; and the solution B comprises the main components of emulsified liquid of long-chain organic fatty acid. The treatment process comprises the following steps: immersing a workpiece nickel coating into the solution A, forming the surface to act with silane, immersing the nickel coating into the solution B for a period of time, and finally washing by using warm water and drying. Due to the treatment, a conversion coating which is excellent in adsorption property is formed on the surface of the nickel coating, the corrosion resistance can be obviously improved, and the appearance and electrical performance of the workpiece are not influenced.

Description

technical field [0001] The invention relates to an anti-corrosion post-treatment solution for the surface of a nickel plating layer and a treatment process thereof, belonging to the technical field of metal surface treatment and corrosion protection. Background technique [0002] Metal nickel or nickel coating is widely used in aviation, automobile, electronics and other industrial fields due to its good performance. However, nickel is prone to corrosion and discoloration in humid air and sulfur-containing industrial atmospheres. The discolored nickel layer not only loses the metallic luster of nickel, but also increases the contact resistance of the nickel surface and reduces the bonding force between nickel and other surface coatings. , causing peeling of the surface coating, while nickel oxides and sulfides will also reduce the welding performance of nickel, so that the phenomenon of virtual welding often occurs. [0003] In recent years, the price of nickel and its s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32C23C22/58
Inventor 刘光明刘斌于斐田继红
Owner NANCHANG HANGKONG UNIVERSITY
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