If you look closely, you can see that it is a precision part with a brush plating transition layer on the outer surface. Various metal coatings have their own safe thickness. When using, be careful not to remove this brush plating transition layer.

The thicker the coating, the longer the coating time, the greater the current, the coarser the crystallization and stress of the coating, and the quality of the coating cannot be guaranteed. At this time, the working layer is bright nickel, nickel tungsten alloy Casting mould or iron alloy. When the plating solution corrodes the substrate, or when a substitution reaction occurs between the plating solution and the base metal, the transition layer can be pre-plated, which can prevent poor replacement coating bonding or corrosion of the base metal by the plating solution. After the transition layer is plated, the working layer can be plated directly.

Brush plating can obtain good adhesion without a transition layer, but with a transition layer, the adhesion can be improved. The transition layer of copper castings is also called primer or pre-coating.Qualified copper castings are widely used in various machines, so pay attention to their performance when using them. Although the brush plating transition layer of copper castings is relatively thin, it can protect the castings very well, and at the same time play a great role in corrosion protection and polishing.

Once the plating thickness of copper castings exceeds the safe thickness, cracks on the plating surface will increase. Before electroplating, the coating structure should be designed and appropriate measures should be taken. Generally, there is no need to pre-plated transition layer for anti-corrosion coating. Sometimes, according to the surface requirements of copper castings, after plating a layer of nickel or copper on the transition layer, a thin layer of bright nickel or nickel-tungsten alloy or iron alloy is also covered