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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: react with the negative electrode, and a certain thickness of oxide film is formed on the metal surface roughness after a period of reaction. How Does Anodizing Happen? The process described for ...

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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Blackening Coating