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Copper alloy chromium-free passivation solution

A chrome-free passivation, copper alloy technology, applied in the direction of metal material coating process, can solve the problems of high toxicity, human health hazards of plated parts, serious environmental pollution, etc.

Inactive Publication Date: 2017-08-22
XIAMEN RUNNER IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, chromate passivation solution is usually used for passivation, but chromate passivation solution contains hexavalent chromium, which is highly toxic and causes serious environmental pollution. Plated parts are likely to cause harm to human health in the process of production and recycling
[0004] Among the inorganic salt passivation formulas and processes, high chromic acid passivation causes serious environmental pollution and has a negative impact on human health. Low-chromium passivation solutions and ultra-low-chromium passivation solutions and their operating processes reduce environmental pollution and reduce cost of sewage treatment, but did not fundamentally solve the pollution problem of hexavalent chromium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A chromium-free passivation solution for copper alloy, which is composed of the following components in parts by weight: 25 parts of lanthanum niobate, 35 parts of hydrogen peroxide, 2 parts of amino acids, 6 parts of sodium malate, and 1 part of tolyltriazole , 2 parts of propylene glycol, 40 parts of deionized water.

[0017] The preparation method of the lanthanum molybdate is as follows: lanthanum nitrate and niobium oxalate are dissolved in 100ml of deionized water in a molar ratio of 5:1, after stirring for 15 minutes, melamine is added, ultrasonically dispersed for 10 minutes, and slowly added dropwise under stirring conditions 10ml of sodium sulfide solution, the resulting suspension was stirred for 3 hours, placed in a high-temperature reactor at 160°C for 8 hours, and the product was centrifuged after the reactor was cooled to room temperature, washed several times with deionized water and absolute ethanol , and then dried at 80°C for 6h to obtain La 1.4 Nb ...

Embodiment 2

[0022] A chromium-free passivation solution for copper alloy, which is composed of the following components in parts by weight: 20 parts of lanthanum titanate, 30 parts of hydrogen peroxide, 1 part of amino acid, 5 parts of sodium malate, and 0.5 part of tolyltriazole , 1 part of propylene glycol, 30 parts of deionized water.

[0023] The preparation method of the lanthanum titanate is as follows: dissolve lanthanum nitrate and titanium nitrate in 100ml of deionized water at a molar ratio of 6:1, stir for 10 minutes, add melamine, ultrasonically disperse for 15 minutes, and slowly add 10ml of After the obtained suspension was stirred for 3 hours, it was placed in a high-temperature reactor at 120°C for 10 hours. After the reactor was cooled to room temperature, the product was centrifuged and washed several times with deionized water and absolute ethanol. Then dry at 60°C for 8 hours to obtain La 1.2 Ti 0.5 -C 3 N 4 heterogeneous alloys.

[0024] When passivating copper a...

Embodiment 3

[0028] A chromium-free passivation solution for copper alloy, which is composed of the following components in parts by weight: 20 parts of lanthanum niobate, 30 parts of hydrogen peroxide, 1 part of amino acid, 5 parts of sodium malate, and 0.5 part of tolyltriazole , 1 part of propylene glycol, 30 parts of deionized water.

[0029] The preparation method of the lanthanum niobate is as follows: lanthanum nitrate and niobium oxalate are dissolved in 100ml of deionized water in a molar ratio of 6:1, after stirring for 10 minutes, melamine is added, ultrasonically dispersed for 15 minutes, and slowly added dropwise under stirring conditions 10ml of sodium sulfide solution, the resulting suspension was stirred for 3 hours, then placed in a high-temperature reactor at 150°C for 6 hours, and after the reactor was cooled to room temperature, the product was centrifuged and washed several times with deionized water and absolute ethanol , and then dried at 60°C for 8h to obtain La 1....

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PUM

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Abstract

The invention discloses a copper alloy chromium-free passivation solution which is composed of, by weight, 20-30 parts of lanthanum alloy salt, 30-40 parts of hydrogen peroxide, 1-5 parts of amino acid, 5-10 parts of sodium malate, 1-5 parts of a stabilizer and 30-50 parts of deionized water. The copper alloy chromium-free passivation solution is good in passivation effect, binding force between a passivation film and a plating is large, a copper alloy treated by the passivation solution is obviously improved in corrosion resistance, and the environment pollution problem can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a chromium-free passivation solution for copper alloys. Background technique [0002] In order to improve the corrosion resistance of copper alloys, increase surface gloss and anti-pollution ability, passivation treatment is generally required after surface treatment of copper alloys to form a dense and stable film on the surface. [0003] In the prior art, chromate passivation solution is usually used for passivation, but chromate passivation solution contains hexavalent chromium, which is highly toxic and causes serious environmental pollution. Plated parts are likely to cause harm to human health in the process of production and recycling . [0004] Among the inorganic salt passivation formulas and processes, high chromic acid passivation causes serious environmental pollution and has a negative impact on human health. Low-chromium passivation solutions and ultra-lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40C23C22/52
CPCC23C22/40C23C22/52
Inventor 金碧陈玲连华景李明仁
Owner XIAMEN RUNNER IND CORP
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