Types of surface treatment:
Surface treatment is the process of forming a covering layer on the surface of the workpiece by a certain method. Its purpose is to endow the surface beauty and anti-corrosion effect of the product. The surface treatment methods are all attributed to the following methods:
1. Electroplating: Immerse the part to be plated in an aqueous solution containing the metal compound to be deposited, and pass the plating solution with a current to precipitate the electroplated metal and deposit it on the part. Generally electroplating has galvanized, copper, nickel, chromium, copper-nickel alloy, etc.,
Sometimes include black cooking (bluish), phosphating, etc.
2. Hot-dip galvanizing: This is done by immersing carbon steel parts in a molten zinc plating tank with a temperature of about 510 ° C. As a result, the iron-zinc alloy on the surface of the steel part gradually becomes passive zinc on the outer surface of the product. Hot dip aluminum plating is a similar process.
3. Mechanical plating: The particles of the coated metal impact the surface of the product, and the coating is cold welded to the surface of the product.
Link to this article：Screw Surface Treatment Process
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