CWF-804A high temperature black salt is used at high temperature to form a protective oxide film on the surface of steel workpiece. When some workpiece 804 is black and red, 804A can be used. The color of the film is black or blue depending on the material and surface state. black. The oxide film of steel workpieces is bright and beautiful, with excellent decoration and protection.
Using parameters
Concentration: 650-700g/L
Temperature: 130-135 ° C (keep boiling).
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