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Pickling passivation agent for copper and copper alloy as well as preparation method and application of pickling passivation agent

A passivation agent, copper alloy technology, applied in the direction of metal material coating process, etc., can solve problems such as failure to achieve copper and copper alloy, and achieve the effect of low operational hazard and simple process

Active Publication Date: 2013-04-24
北京蓝星清洗有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the yellow smoke and chromium pollution are already at a low value, it still fails to meet the process requirements of pollution-free copper and copper alloy bright pickling and chromium-free passivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Cleaning agent ratio: sulfuric acid 7%, disodium hydrogen phosphate 2%, sodium nitrate 4%, A-type passivator 5%, the rest is water, A-type passivator is benzotriazole, iron sulfate mass ratio 1 : 10 compounded;

[0023] Liquid distribution tank: stainless steel liquid storage tank;

[0024] Specific operation: At room temperature, manually place the copper pipe fittings (hollow long tube, length 2m, hole diameter 6mm, wall thickness 1.5mm) in the quick cleaning passivator for 30s, take it out, rinse with water and take it out;

[0025] Cleaning effect: The surface of the copper pipe fittings presents a mirror-like bright color, and there is no discoloration after 48 hours in the workshop of a factory in Yanjiao.

Embodiment 2

[0027] Cleaning agent ratio: sulfuric acid 10%, disodium hydrogen phosphate 4%, sodium nitrate 2%, A-type passivator 9%, the rest is water, A-type passivator is benzotriazole, iron sulfate mass ratio 1 : 10 compounded;

[0028] Cleaning liquid container: stainless steel liquid storage tank;

[0029] Specific operation: At room temperature, manually place the brass pipe fittings in the quick cleaning passivator for 30 seconds, and take them out. Remove after rinsing with clean water;

[0030] Cleaning effect: The surface of the brass pipe fittings presents a mirror-like bright color, and there is no discoloration after 48 hours in the workshop of a factory in Yanjiao.

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PUM

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Abstract

The invention discloses a pickling passivation agent for copper and copper alloy as well as a preparation method and an application of the pickling passivation agent. The pickling passivation agent comprises the following components by weight percent: 5-15% of sulfuric acid, 1-5% of disodium hydrogen phosphate, 1-5% of sodium nitrate, 5-10% of an A-type passivation agent and the balance of water. According to the invention, after copper or copper alloy is soaked for 30 seconds of immersion, a discolored part, which is formed by high-temperature oxidization, on the surface of the copper or copper alloy can be completely removed, and then a quick and efficient washing effect can be achieved at normal temperature, and the copper or copper alloy does not rust again in a storage period of the process; and the pickling passivation agent is particularly applicable to washing and passivating copper alloy pipes for solar devices.

Description

technical field [0001] The invention relates to a copper and copper alloy pickling passivator and a preparation method thereof, belonging to the field of metal surface cleaning, in particular to the surface cleaning of copper and copper alloy materials. Background technique [0002] Copper and copper alloy products are widely used in heavy industry, light industry, household appliances and instrumentation electrical products. However, copper and copper alloys are easily oxidized and discolored in the atmosphere, especially in harsh environments, which will cause the products to rust and form a patina, changing the original color of copper. This not only affects the appearance quality of the product but also damages some of its own performance. For this reason, many surface treatment workers have worked hard for a long time to develop many special treatment methods, which not only prevent the oxidation of the product itself, but also give the product a beautiful appearance. ...

Claims

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Application Information

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IPC IPC(8): C23G1/10C23C22/07
Inventor 单素灵王双田曹季明王晓琴文措杰李维李海
Owner 北京蓝星清洗有限公司
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