Connector Electroplating Problem Analysis
In the connector electroplating, due to the high requirements for the electrical properties of the contact pair, the gold-plating process occupies an obvious and important position in the connector electroplating. At present, in addition to some bar connectors using selective plating, a large number of pinhole parts are still gold-plated by barrel plating and vibration plating.In recent years, the volume of the connector has become more and more miniaturized, the gold-plated quality problem in the pinhole is becoming more and more prominent, and the quality requirements of the user are also getting higher and higher, and some users even reach a very critical degree of the appearance quality of the gold-plated layer. In order to ensure the quality of the connector gold plating adhesion. These common quality problems are always the key to improving the gold-plated quality of connectors. The reasons for these quality problems are discussed below.
The gold layer color of the connector is not consistent with the normal gold layer color, or the gold layer color of different departments in the same set of products is different, the reason for this problem is:
1. The influence of impurities in gold-plated raw materials
When the impurities brought by the chemical substances added to the plating solution exceed the fault tolerance of the gold plating solution, it will quickly affect the color and brightness of the gold plating layer.If it is affected by organic impurities, it will appear that the cash layer darkens and blooms. Check whether the location of the darkening and flowering is fixed with a Hall cell sample. If the metal impurities interfere, the effective range of the current density will be narrowed, and the Hall cell test shows that the current density of the sample is not bright at the low end or the high-end coating is not bright at the low end. Reflected to the plated part, the coating is red or even black, and the color change in the hole is obvious.
2. Gold plating current density is too high
Due to the calculation error of the total area of the plating tank parts, its value is greater than the actual surface area, so that the gold plating current is too large, or its amplitude is too small when using vibration gold plating, so that the gold plating layer in the tank is all or part of the rough crystallization, and the gold plating layer is red visually.
