When the alkaline zinc coating becomes rough and dark, and has poor adhesion, what causes this? Besides being related to the alkaline zinc plating brightener, there is another possibility. In this article, we will analyze it.
① Excessive zinc ion concentration accompanied by low sodium hydroxide concentration
As we mentioned in the previous article, the stability of the zincate ion complex is one order of magnitude lower than that of the zinc cyanide complex. This can be said to be inherently insufficient. If, in addition, the concentration of zinc ions is high while the concentration of sodium hydroxide is insufficient, the coordination strength of zincate will be even weaker, the cathode polarization effect will be lower, the discharge will become easier, and the galvanized layer will naturally become rough and dark.
② Insufficient alkaline zinc plating brightener or poor quality of the brightener itself
This requires selecting high-quality alkaline zinc plating brighteners and ensuring that the dosage is not too low. As mentioned earlier, the zinc sulfate plating solution has inherent deficiencies in coordination ability. The reason why it can achieve fine crystallization and a bright coating is entirely due to the effect of the alkaline zinc plating brighteners.
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