Trivalent chromium blue and white passivation solution is widely used in the electroplating industry, mainly for passivation treatment after galvanizing process. Its main function is to improve the corrosion resistance of the plated layer. However, with the use of time, the passivation solution will gradually aging. The causes of aging include the accumulation of organic impurities, non-uniformity of the components in the passivation solution, changes in pH, solution temperature and contamination with metal ions. Changes in these factors directly affect the performance of the passivation solution, leading to a series of plating failures.
First of all, the aging of passivation solution will directly affect the quality of passivation film. Fresh passivation solution can uniformly form a dense, uniform passivation film on the galvanized surface, while the aging of the passivation solution due to the reduction of active ingredients, impurities increase, will make the passivation film generation is not complete. Specifically manifested in the passivation film color darkening, uneven, and even spots. This uneven passivation film not only affects the aesthetics, but also reduces the corrosion resistance of the coating.
Secondly, aged passivation solutions lead to a decrease in the corrosion resistance of the passivate film. Classical studies have shown that the corrosion resistance of passivate films is closely related to their densification and integrity. Aging passivation solutions do not provide sufficient protection due to compositional changes, and passivate films become susceptible to cracking, flaking, or rapid failure in high humidity environments. Such passivation films corrode rapidly when exposed to corrosive media, resulting in an accelerated corrosion rate of the underlying galvanized layer or even the base metal.
Thirdly, the aging of the passivation solution will also affect the stability of the process. The stability of the passivation solution in the use of the process is very important, aging passivation solution is chemically unstable, may lead to passivation process out of control. Common problems in practice include longer passivation times and unstable passivation results. This not only increases the difficulty of the process, but also reduces productivity, and may also bring a high rework rate, which should cause electroplating practitioners to pay close attention to.
Therefore, in order to ensure the quality of the plating layer, the passivation solution should be tested and maintained regularly, using Bigely trivalent chromium blue-white passivation solution (which is not easy to age), and replaced when necessary. In addition, controlling the operating conditions and avoiding external contamination and unnecessary chemical reactions are also important measures to slow down the aging of the passivate. Through these methods, plating failures caused by passivate aging can be reduced, and the functionality and aesthetics of the plated layer can be ensured to meet the expected standards.
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