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Chromate-free passivation treating agent for nickel-plated surface and treating process

A chromium-free passivation and treatment agent technology, applied in the coating process of metal materials, etc., can solve the problems of chromate passivation treatment technology limitations, human health and ecological environment hazards, etc., and achieve simple environmental protection and corrosion resistance and oxidation resistance improvement, good electrical conductivity and weldability

Inactive Publication Date: 2016-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hexavalent chromium is extremely harmful to human health and the ecological environment, causing the chromate passivation treatment technology to be gradually limited

Method used

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  • Chromate-free passivation treating agent for nickel-plated surface and treating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of nickel-plated surface chromium-free passivation treatment agent of the present embodiment is formulated according to the parts by weight of the following components: 10 parts of sodium hydroxide, 20 parts of potassium persulfate, 5 parts of sodium silicate, 10 parts of sodium phosphate , 3 parts of sodium carbonate, 52 parts of deionized water.

[0024] The above-mentioned nickel-plated surface chromium-free passivation treatment agent is made according to the following steps:

[0025] (1) Sodium hydroxide is poured into deionized water, and stirred at normal temperature and pressure until completely dissolved;

[0026] (2) Sodium phosphate, sodium silicate and sodium carbonate are poured into the solution obtained in step (1), and stirred at normal temperature and pressure until completely dissolved;

[0027] (3) Pour potassium persulfate into the solution obtained in step (2), and stir at normal temperature and pressure until completely dissolved to obtain ...

Embodiment 2

[0031] A chromium-free passivation treatment agent for nickel-plated surfaces of this embodiment is prepared according to the parts by weight of the following components: 10 parts of sodium hydroxide, 20 parts of potassium persulfate, 5 parts of sodium silicate, and 15 parts of sodium tungstate 3 parts, 3 parts of sodium carbonate, 47 parts of deionized water.

[0032] The above-mentioned nickel-plated surface chromium-free passivation treatment agent is made according to the following steps:

[0033] (1) Sodium hydroxide is poured into deionized water, and stirred at normal temperature and pressure until completely dissolved;

[0034] (2) Pour sodium tungstate, sodium silicate and sodium carbonate into the solution obtained in step (1), and stir at normal temperature and pressure until completely dissolved;

[0035] (3) Pour potassium persulfate into the solution obtained in step (2), and stir at normal temperature and pressure until completely dissolved to obtain the chromi...

Embodiment 3

[0039] A kind of nickel-plated surface chromium-free passivation treatment agent of the present embodiment is formulated according to the parts by weight of the following components: 10 parts of sodium hydroxide, 20 parts of potassium persulfate, 5 parts of sodium silicate, 3 parts of sodium carbonate , 62 parts of deionized water.

[0040] The above-mentioned nickel-plated surface chromium-free passivation treatment agent is made according to the following steps:

[0041] (1) Sodium hydroxide is poured into deionized water, and stirred at normal temperature and pressure until completely dissolved;

[0042] (2) Sodium silicate and sodium carbonate are poured into the solution obtained in step (1), and stirred at normal temperature and pressure until fully dissolved;

[0043] (3) Pour potassium persulfate into the solution obtained in step (2), and stir at normal temperature and pressure until completely dissolved to obtain the chromium-free passivation treatment agent.

[00...

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Abstract

The invention belongs to the field of passivation agents and discloses a chromate-free passivation treating agent for the nickel-plated surface and a treating process. The chromate-free passivation treating agent is prepared from, by weight, 3-15 parts of sodium hydroxide or potassium hydroxide, 10-30 parts of water-soluble persulfate, 1-10 parts of water-soluble silicate, 0-25 parts of water-soluble phosphate, 0-25 parts of water-soluble tungstate, 1-10 parts of sodium carbonate and 20-85 parts of deionized water. The chromate-free passivation treating agent is environment-friendly and does not contain volatile acid or organic matter, volatilization and odor are avoided in the passivation process, and the treating agent is environment-friendly to production. A passivation film after being treated through the passivation agent ensures that a nickel-plated layer still has good conductivity and welding performance while the corrosion resistance and the oxidation resistance of the nickel-plated surface are improved.

Description

technical field [0001] The invention belongs to the field of passivating agents, and in particular relates to a chromium-free passivating treatment agent and a treatment process for nickel-plated surfaces. Background technique [0002] Because electroless nickel plating and electroplating nickel have excellent comprehensive properties such as hardness, wear resistance, corrosion resistance, electrical conductivity and special magnetic properties, they are widely used in important industries such as automobiles, petroleum, aerospace, mechanical equipment, computers and electronic communications. field. 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 co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60
CPCC23C22/60
Inventor 康志新甘义维陈德馨
Owner SOUTH CHINA UNIV OF TECH
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