Protective agent for copper and copper alloy and preparation method thereof

Abstract

The invention relates to a protective agent for copper and copper alloy and a preparation method of the protective agent. The protective agent comprises the following raw materials by weight percent: 0.2-1% of ethylenediaminetetraacetic acid disodium salt, 1.5-2% of Corrguard SI, 0.5-0.9% of benzotriazole, 1-2% of sodium tetraborate, 10-12% of absolute ethyl alcohol, 1.5-2.5% of self-made semi-manufactured goods and the balance of water. The protective agent does not contain hexavalent chromium capable of polluting the environment, the problems that the film formed by benzotriazole is not uniform, flow marks exist on the film, the passivating temperature is high, and the passivating time is long can be overcome by the compounding of the raw materials, the environmental conservation is good, the film is biodegradable, the filming is uniform, and the protective agent has the advantages of being anti-corrosion, incapable of generating flow marks, being passivated at room temperature with short passivating time (5-10min), low in cost and capable of being diluted by 20 times for use, and ensuring that the copper color is uniform and can not grow dim within one month in the moist mould rains seasons.

Description

technical field [0001] The invention belongs to the field of metal protective agents, and relates to protective agents, in particular to a copper and copper alloy protective agent and a preparation method thereof. Background technique [0002] During the processing and storage of copper and alloys, they are often eroded by humid environments and corrosive gases to cause copper corrosion, which causes the color of the copper surface to change. The traditional copper passivation process is hexavalent chromium, which has a good passivation effect, but due to the serious pollution of hexavalent chromium, the country has explicitly banned it. Although the currently used benzotriazole products have low pollution, the passivation temperature is high, the time is long, the passivation effect is not ideal, and there are flow marks on the surface. [0003] Through searching, the following two published patent documents were found: [0004] A water-soluble copper protective agent and...

AI Technical Summary

Problems solved by technology

The traditional copper passivation process is hexavalent chromium, which has a good passivation effect, but due to the serious pollution of hexavalent chromium, the country has explicitly banned

Although the currently used benzotriazole products have low pollution, the passivation temperature is high, the time is long, the passivation effect is not ideal, and there are flow marks on the surface

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