What are the common surface treatments for m2 self tapping screws?

Recently, the customer service of Shi Shi Tong reported that many customers would ask whether m2 self tapping screws can be plated with black zinc or nickel.

In fact, the screw surface treatment, so as to enhance the corrosion resistance of metal, increase hardness, improve electrical conductivity, lubricity, heat resistance and surface appearance.Here by the World Stone Metal Co., Ltd. to tell you: m2 self tapping screws common surface treatment what.

• Electroplating: coating metal as an anode, is oxidized into cation into electroplating solution;The metal products to be plated as the cathode, coating metal cation is reduced on the metal surface to form a coating.Commonly used electroplating metals are copper, chromium, nickel, silver, gold and so on.
• Passivation: dissolve the iron pollutants hidden in the screw, so that the surface of the screw to form a passivation protective film, prevent metal and corrosive medium direct contact, to achieve a anticorrosion and rust prevention purpose.
• Blackening: blackening treatment is now commonly used in the traditional alkaline heating blackening and late blackening at room temperature two kinds.An oxide film is formed on the metal surface by alkaline chemical oxidation.
• Electrophoresis: is the use of electrophoresis will paint, rubber and other particles evenly covered on the surface of the screw fastener, through electrophoresis of the surface treatment, screw surface coating to be uniform, smooth and smooth.
• Anodic oxidation: chemical or electrochemical treatment to form a skin film on a metal surface containing the metal component.Most metallic materials (such as stainless steel, zinc alloy, aluminum alloy, titanium alloy) can be anodized in a suitable electrolyte.
• Dachro: generally silver and black, the advantage is good rust resistance, suitable for carbon steel and stainless steel materials.

Shi Shi Tong Metal Products Co., Ltd. has many kinds of surface treatment of m2 self tapping screws, which depends on the customer’s requirements for screw surface treatment and screw material. If you also have requirements can directly contact Shi Shi Tong: annie.li@szsst88.com  whatsapp：+86 18124507113