Assembling parts The reason for the discoloration of parts

Assembly parts electroplating has the function of improving mechanical capacity, corrosion resistance and improving electrical performance. If the plating of the product is discolored, these functions will be unstable and the appearance will be greatly lost. What makes it discolored? Below we analyze the reasons for the discoloration of metal coatings.

1. It is related to its structural shape: compared with the strip, the hardware terminal structure is complicated, and the unevenness changes greatly, which leads to current distribution problem on the surface of the component during electroplating. Therefore, the protruding portion of the portion is distributed with a large amount of current, and the plating layer is thick; the current is distributed in the depressed portion, and the plating layer is thin. The coating is then thin, not thick enough, and the protection is reduced. This is why the product depression first discolors and the other parts change color.


2, related to the performance of the plating solution: the performance of the plating solution is measured by two indicators, one is the plating capacity of the plating solution, that is, the plating solution makes the coating thickness evenly distributed on the component; the other is the depth capability of the plating solution, ie The plating solution deposits a metallic coating on the deep grooves of the part. Both of these features are not good, the coating is very thin, and the metal product plating is easy to change color.

3. It is related to the speed of motion: the crystallization process of metal ions on the hardware terminals must involve time factors. The same machine, plating solution, process, if the parts are electroplated for a long time, the coating is thick, the time is short, and the plating is thin. This plating time actually refers to the problem of the plating speed of the component. If the walking time is short, the plating will be thinner and the electroplated coating of the hardware product will be prone to discoloration and vice versa.

Fortunately, at DG Fortuna Metals, we have been working with several experienced and reliable plating suppliers who can guarantee the plating requirements for stamped and CNC machined parts.


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