1. Galvanized
Characteristics: Zinc is relatively stable in dry air and is not easy to discolor. protective role.
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Zinc is very sensitive to corrosion in acids, alkalis and sulfides. The galvanized layer must generally be passed. For spring parts, slim walls (wall thickness <0.5 m) and steel parts with high mechanical resistance, elimination of hydrogen must be carried out and copper alloy parts and copper alloy parts and copper alloy parts and parts copper cannot be eliminated.
The standard zinc potential has a low cost, easy treatment and good results are relatively negative, so zinc veneer is an anodic coating for many metals. Click to receive the CNC 10G programming tutorial for free
Application: make the general use of galvanization in atmospheric conditions and other good environments. But it is not suitable for friction parts
2. Plated chrome
Characteristics: Chrome is very stable in the wet atmosphere, alkali, nitric acid, sulfide, carbonate solutions and organic acids, and is easily soluble in hydrochloric acid and sulfuric acid concentrated to hot. Under the action of direct current, like the chrome layer as an anode, it is easily soluble in the soda caustic solution.
The chrome layer has strong adhesion and high hardness, 800 ~ 1000V, good wear resistance, high reflectivity of light and high heat resistance. Its drawbacks are hard, brittle, easy to die for and are more obvious when subject to alternate impact loads. And porous.
Metallic chrome is easily passed in the air to form a passivation film, thus modifying the potential of the chrome. Therefore, iron chrome becomes a cathodic coating.
Application: It is not ideal to go directly on the surface of steel parts as an anti-corrosion layer. Currently, it is widely used to improve wear resistance, size repair, light reflection and decorative lamps of the parts.
3. Nickel plating
Characteristics: Nickel has good chemical stability in the atmosphere and alkaline liquid, is not easy to discolor and is only oxidized when the temperature is greater than 600 ° C. It dissolves slowly in the sulfuric acid And hydrochloric acid, but is easily soluble in diluted nitric acid. It is easy to go through concentrated nitric acid and therefore has good corrosion resistance.
Nickel veneer has high hardness, is easy to polish, has a high light reflectivity and can increase aesthetics. His drawback is his porosity.
Nickel is a cathodic coating for iron and anodic coating for copper.
Application: In order to avoid corrosion and increase aesthetics, it is generally used to protect decorative coatings. Nickel veneer on copper products is ideal for corrosion protection
However, as nickel is more expensive, copper -plated alloys are mainly used instead of nickel.
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