Types of fastener surface treatment

Surface treatment is the process of forming a covering layer on the surface of the workpiece through a certain method. Its purpose is to give the product surface a beautiful and anti-corrosion effect. The surface treatment methods carried out are attributed to the following methods:

1. Electroplating: Immerse the electroplated parts in an aqueous solution containing the metal compound to be deposited, and pass current through the plating solution to precipitate and deposit the electroplated metal on the parts. Generally, electroplating includes zinc, copper, nickel, chromium, copper-nickel alloy, etc. Sometimes boiled black (blue), phosphating, etc. are also included. (Guide: Basic knowledge of metal heat treatment)

2. Hot-dip galvanizing: The carbon steel parts are immersed in a molten zinc plating tank with a temperature of about 510℃. The result is that the iron-zinc alloy on the surface of the steel gradually becomes passivated 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 are used to impact the surface of the product, and the coating is cold welded to the surface of the product.

Generally, the screws are mostly electroplated, but the hexagonal wood screws used in electric power, highways and other outdoor use hot-dip galvanizing; the cost of electroplating is generally 0.60.8 yuan per kilogram, and the hot-dip galvanizing is generally 1.52 yuan/kg ,higher cost.

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