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Chromium-free passivator for copper part

A chromium-free passivator and copper-based technology, which is applied in the coating process of metal materials, can solve the problems of complex processing, restriction of the use of chromic acid and its salts, and environmental pollution, so as to simplify the operation process and benefit the environment. , good anti-corrosion effect

Inactive Publication Date: 2015-09-09
张慧玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chromic acid and its salts are highly toxic and carcinogenic, and the treatment of wastewater containing hexavalent chromium is more complicated. Small-scale enterprises generally do not have the conditions to treat wastewater containing chromium, and they are unwilling to treat it and discharge it directly. , has caused serious pollution to the environment. With the enhancement of environmental awareness and the long-term interests of environmental protection, the use of chromic acid and its salts will be strictly prohibited. Therefore, the development of environmentally friendly passivation products and Reasonable chromium-free passivation agent process is very necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A kind of chromium-free passivating agent for copper parts described in the present embodiment 1 is made up of the raw material formula component of following mass percentage: Comprise 50 parts of acetic acid, 30 parts of oxalic acid, 5 parts of sodium citrate, 3 parts of ammonium dihydrogen phosphate, 5 parts of disodium hydrogen phosphate, 4 parts of calcium hydrogen phosphate, 3 parts of sodium starch glycolate, 5 parts of polyaspartic acid, 6 parts of hydroxyethylidene diphosphonic acid, 5 parts of diethylene triamine pentamethylene phosphonic acid, 5 parts of methyl methacrylate, 3 parts of ammonium sulfamate, 8 parts of tert-butyl hydroperoxide, 150 parts of purified water.

Embodiment 2

[0011] A kind of chromium-free passivating agent for copper parts described in the present embodiment 2 is made up of the raw material formula component of following mass percentage: Comprise 80 parts of acetic acid, 50 parts of oxalic acid, 10 parts of sodium citrate, 5 parts of ammonium dihydrogen phosphate, 8 parts of disodium hydrogen phosphate, 6 parts of calcium hydrogen phosphate, 5 parts of sodium carboxymethyl starch, 10 parts of polyaspartic acid, 10 parts of hydroxyethylidene diphosphonic acid, 10 parts of diethylenetriaminepentamethylene phosphonic acid, 10 parts of methyl methacrylate, 5 parts of ammonium sulfamate, 10 parts of tert-butyl hydroperoxide, 200 parts of purified water.

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PUM

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Abstract

Disclosed is chromium-free passivator for a copper part. In terms of a raw material formula, the chromium-free passivator for the copper part comprises, by mass, 50-80 parts of acetic acid, 30-50 parts of oxalic acid, 5-10 parts of sodium citrate, 3-5 parts of ammonium dihydrogen phosphate, 5-8 parts of disodium hydrogen phosphate, 4-6 parts of dicalcium phosphate, 3-5 parts of sodium carboxymethyl starch, 5-10 parts of poly-aspartic acid, 6-10 parts of 1-hydroxyethylene-1,1-diphosphonic acid, 5-10 parts of diethylenetriamine penta methylene phosphonic acid, 5-10 parts of methyl methacrylate, 3-5 parts of ammonium sulfamate, 8-10 parts of tert-butyl hydroperoxide and 150-200 parts of purified water. The chromium-free passivator for the copper part enables the copper part to keep good corrosion resistance, can facilitate environmental protection and simplification of the operating technology, improves the production efficiency, and avoids the phenomena that due to the fact that a large amount of poisonous acid mist or chromic acid is generated when workpieces are processed through acid pickling, operators are harmed, and the environment is polluted.

Description

technical field [0001] The invention relates to the technical field of a passivating agent, in particular to a chromium-free passivating agent for copper parts. Background technique [0002] At present, because copper and its alloys have excellent thermal conductivity, they are widely used in the refrigeration industry, but because O2, CO2, H2S, SO2 in the air easily react with copper, the surface turns black, affecting its appearance and Thermal conductivity, so copper refrigeration pipes must be passivated. At present, the passivation process commonly used by domestic refrigeration arm production plants is chromic acid passivation, which is for the purpose of chromic acid passivation treatment can form a mixture oxide film of chromium / base metal. However, chromic acid and its salts are highly toxic and carcinogenic, and the treatment of wastewater containing hexavalent chromium is more complicated. Small-scale enterprises generally do not have the conditions to treat wast...

Claims

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Application Information

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IPC IPC(8): C23C22/47
Inventor 张慧玲
Owner 张慧玲
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