In connector plating, due to the high electrical performance requirements of contact pairs, the gold plating process occupies an obvious and important position in connector plating. At present, in addition to the selective electroplating process of some strip connectors, the gold plating in the holes of a large number of pinhole parts is still carried out by barrel plating and vibration plating. In recent years, the volume of the connector has developed to become more and more miniaturized, the gold plating quality problem in the hole of the pinhole parts has become more and more prominent, and the user's quality requirements for the gold layer are getting higher and higher, and some users have even reached a very picky degree about the appearance quality of the gold layer. In order to ensure the quality adhesion of the connector gold plating layer, these common quality problems are always the key to improving the gold plating quality of the connector. The following is a discussion of the causes of these quality problems.
1. The color of the gold layer is abnormal
The color of the gold plating layer of the connector is inconsistent with the normal gold layer color, or the gold layer color of different parts in the same supporting product is different, the reason for this problem is:
2. Influence of impurities of gold plating raw materials
When the chemical material added to the plating solution brings impurities that exceed the tolerance of the gold plating solution, it will quickly affect the color and brightness of the gold layer. If it is affected by organic impurities, the phenomenon of darkening and flowering of the gold layer will occur, and the Haoer groove specimen will check the darkening and the position of the flowering is not fixed. If metal impurities interfere, the effective range of current density will be narrowed, and the Haoer slot test shows that the low end of the current density of the specimen is not bright or the high end plating is not bright at the low end. Reflected on the plated part, the plating layer is red or even black, and the color change in the hole is obvious.
3. The current density of gold plating is too large
Due to the calculation error of the total area of the plating tank parts, its value is larger than the actual surface area, so that the gold plating current is too large, or its amplitude is too small when vibrating gold plating is used, so that all or part of the gold plating layer in the groove is crystallized roughly, and the visual gold layer is red.
