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Passivant for nickel plating and nickel plating passivation method

A passivating agent and nickel plating technology, which is applied in the field of passivating agent for nickel plating and nickel plating passivation, can solve the problems of long passivation time, high production cost, limited application range, etc., and achieve good salt spray effect Effect

Inactive Publication Date: 2019-04-19
广州传福化学技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chromium-free formula has disadvantages such as poor salt spray effect, limited application range, and long passivation time, and a long passivation time will bring higher production costs, which has a great impact on the economic benefits of the enterprise.

Method used

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  • Passivant for nickel plating and nickel plating passivation method
  • Passivant for nickel plating and nickel plating passivation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Passivator formula ratio: vegetable oleic acid 0.6ml / L, absolute ethanol 0.6ml / L, triethanolamine 0.6ml / L, and the balance is water.

[0039] Mix the above formula into a passivator and set aside.

[0040] Ultrasonic degreasing of iron parts for 10 minutes, washing with water for 3 times, derusting and activation with 20-30% hydrochloric acid, washing with water for 3 times, electroless nickel plating with medium phosphorus for 0 minutes, nickel plating temperature at 90 degrees, pH value 4.5.

[0041] Soak the nickel-plated iron piece in a passivating agent, the soaking temperature is 60°C, and the soaking time is 2-4 minutes. The workpiece after soaking is washed with water, then washed with pure hot water, and then dried.

Embodiment 2

[0043] Passivator formula ratio: vegetable oleic acid 0.6ml / L, absolute ethanol 0.8ml / L, triethanolamine 0.6ml / L, and the balance is water.

[0044] Mix the above formula into a passivator and set aside.

[0045] Ultrasonic degreasing of iron parts for 10 minutes, washing with water for 3 times, then 20-30% hydrochloric acid for derusting and activation, washing with water for 3 times, electroless nickel plating with medium phosphorus for 30 minutes, nickel plating temperature is 90 degrees, pH value is 4.5.

[0046] Soak the nickel-plated iron piece in a passivating agent, the soaking temperature is 60°C, and the soaking time is 2-4 minutes. The workpiece after soaking is washed with water, then washed with pure hot water, and then dried.

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Abstract

The invention provides a passivant for nickel plating and with the good salt fog effect and a nickel plating passivation method. The passivant for nickel plating comprises, by weight part, 0.1 to 5 parts of oleic acid, 0.1 to 5 parts of absolute ethyl alcohol and 0.1 to 5 parts of triethanolamine. The oleic acid is vegetable oleic acid. The passivant for nickel plating and the nickel plating passivation method have the good salt fog effect.

Description

technical field [0001] The invention belongs to the technical field of electroplating chemistry, and in particular relates to a passivation agent for nickel plating and a passivation method for nickel plating. Background technique [0002] Electroless nickel plating and electroplating nickel have excellent comprehensive properties such as hardness, wear resistance, corrosion resistance, electrical conductivity and special magnetic properties, so they are widely used in important fields such as automobiles, petroleum, aerospace, mechanical equipment, computers and electronic communications. . However, in the atmospheric or corrosive environment, nickel oxides or sulfides are easily formed on the surface of nickel plating. This layer of oxides will cause the surface of the coating to lose its metallic luster, turn yellow and darken, or appear spots, which seriously affect the appearance of the coating. For the PCB field, this layer of oxide not only increases the contact resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/48C23C22/50
CPCC23C22/50C25D5/48
Inventor 黎效传
Owner 广州传福化学技术有限公司
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