What are the common surface treatments for white self-tapping screws ?
There are several main methods for surface treatment of white self-drilling screws:
Electroplating: Through the electroplating process, a layer of metal can be plated on the surface of the self-drilling screw to form a white color. Commonly used electroplated metals include nickel, chromium, tin, copper, gold, and silver. For example, copper self-drilling screws can be electroplated with silver to turn the surface white.
Anodizing: Anodizing is a chemical or electrochemical process that can produce a film layer containing the metal component on the metal surface. For example, aluminum self-drilling screws can be anodized to turn the surface white.
Passivation: Passivation can dissolve iron contaminants on the screws and form a passivation protective film to prevent corrosion. A white protective layer can be formed on the surface of the screw after passivation.
Dacromet treatment: Dacromet treatment can be plated in a variety of colors such as black, silver gray, and silver white. This treatment method has good anti-rust performance and is suitable for self-drilling screws made of carbon steel and stainless steel.
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