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Plating solution knowledge affecting FPC electroplating quality

Factors affecting the quality of FPC electroplating: PH value, additives, current density, current waveform, temperature, stirring speed, etc. Electroplating can use different metals, such as zinc, nickel and chromium plating.

FPC electroplating

The substances in the plating solution that can promote anode activation are called anode activators. The role of the anode activator is to increase the current density of the anode at the beginning of passivation, so as to ensure that the anode is in the activated state and can be dissolved normally. When the content of anode activator is insufficient, the anode dissolution is abnormal, and the content of main salt decreases rapidly, affecting the stability of the bath. In serious cases, FPC electroplating cannot be carried out normally.

Additives are substances that can significantly improve the performance of the coating without significantly changing the conductivity of the coating. Additives can be divided into brighteners, leveling agents, and fog suppressants according to their role in the bath.

Buffer refers to the substance used to stabilize the pH of solution. This kind of substance is generally composed of weak acid and weak acid salt or weak base and weak alkali salt, which can reduce the change range of pH value of solution when it encounters alkali or acid.

In some cases, if the metal ions of the main salt in the plating solution are simple ions, the coating grains are coarse. Therefore, the plating solution with complex ions should be used. The method for obtaining complex ions is to add complexing agent, i.e., the material that can complexe the metal ions of the main salt to form a complex. Complexes are “molecular compounds” formed by the interaction of simple compounds. In the bath containing complex, the relative content of main salt and complexing agent, that is, the free content of complexing agent, rather than the absolute content, affects the electroplating effect.

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