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Blackening Coating: Put the metal parts into the solution of NaOH, NaNO2 and other potions. At a certain temperature, the parts will react chemically to produce a thin blue (black) oxide film. Blackening can be divided ...

Anodizing: put the parts together in the barrel plating container); 3. Remove the oil stain on the surface of the fixed parts through the oil removal tank. The oil removal process includes ultrasonic oil ...

Blackening Coating: Put the metal parts into the solution of NaOH, NaNO2 and other potions. At a certain temperature, the parts will react chemically to produce a thin blue (black) oxide film. Blackening can be divided ...

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