The purpose of metal surface treatment technology is to improve the surface hardness, wear resistance and corrosion resistance, so as to improve the quality of mold products and extend the service life of dies.

Commonly used are the following oxidation coloring methods: 1. anodized film of aluminum anodized film is dyed by adsorbing dyes. The anodic oxide film of 2. spontaneous anodic oxide film is a kind of anodized oxide film produced spontaneously by the alloy itself under the effect of electrolysis

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