In the process of using zinc nickel alloy color passivator, sometimes the passivation film of the workpiece will appear uneven color of black, yellow and blue.What causes this?
In the process of using alkaline zinc-nickel alloy additives, the current efficiency of the plating solution itself is relatively low, only about 70%.And sometimes the current efficiency is lower, is this because of the low concentration of sodium hydroxide in the bath?
When we use the zinc-nickel alloy trivalent chromium blue passivator, the workpiece can obtain a uniform light blue to cyan blue appearance and a passivation film with strong corrosion resistance.So what points should be paid attention to in the process of using zinc-nickel alloy trivalent chromium blue passivator?
In the production process of using decorative chrome plating additives, we often encounter gray and dull chrome plating and the phenomenon of blooming.However, after the chrome plating layer is removed, the surface of the nickel plating layer below is normal. What is the reason for this?
Some customers reported that in the production process of using alkaline galvanizing brightener, the appearance of the coating after the workpiece is galvanized is good, but the coating has foaming phenomenon after baking, what is the reason for this?
A few days ago, a friend had such a problem in the process of using nickel sulfamate additives:The concentration of nickel sulfamate in the bath was 700 ml/L, and the pH of the bath was 4.3 at the beginning.After an hour, the pH value dropped to 3.7, and then stabilized at about 3.7. The pH value of the plating solution was adjusted with basic nickel carbonate but did not rise.What is the reason for this?
