It has the advantages of good electrical conductivity, fast heat transfer, light specific gravity, and easy molding. However, aluminum and aluminum alloys have shortcomings such as low hardness, not wear-resistant, prone to intergranular corrosion, and difficult to weld, which affect the scope of use. Therefore, in order to maximize strengths and avoid weaknesses, electroplating is used to solve this problem in modern industry.
Advantages of aluminum electroplating
1) Improve decoration,
2) Improve surface hardness and wear resistance
3) Reduce the friction coefficient and improve lubricity.
4) Improve surface conductivity.
5) Improve corrosion resistance (including combination with other metals)
6) Easy to solder
7) Improve the bonding force when hot pressing with rubber.
8) Improve reflectivity
9) Fix dimensional tolerances
Since aluminum is a relatively active metal, the electroplated objects are more active than aluminum materials. Therefore, before electroplating, corresponding chemical transformations must be made, such as zinc immersion, zinc-iron alloy, zinc-nickel alloy, so that the bottom layer of zinc and zinc alloy The middle layer has good adhesion to the cyanide copper plating layer. Due to the loose structure of the die-cast aluminum body, the surface part of the body cannot be polished off when polishing, otherwise pinholes, acid spitting, peeling and other phenomena will occur.
