The failure of yellowing after plating in the barrel nickel plating process in electroplating plant will undoubtedly increase the difficulty of delivery, whether it is the delay of production schedule or the waste of raw materials, it is a loss. So in addition to the yellowing of the water imprint and the yellowing of the pinhole, what other reasons can cause yellowing after plating?
Yellowing of zinc-nickel alloy plating in the low current region is usually related to process parameters, bath composition and operating conditions. The following are a few possible causes of yellowing in the low current region:
Wetting agents play an important role in the bright sulfate copper plating process , mainly used to reduce the surface tension, so as to improve the contact between the bath solution and the surface of the object to be plated, to enhance the fluidity of the solution and to prevent the adhesion of air bubbles on the surface of the workpiece. Failure to add a wetting agent to the bright sulfate copper plating bath can lead to a variety of plating failures.
The interaction of the different components in the potassium chloride galvanizing system is complex. The fact that the plating is not bright instead of bright after the addition of a potassium chloride galvanizing brightener may be due to a number of factors, and here are some possible explanations:
Blistering of galvanizing passivation films is a common quality problem in the plating industry, which not only affects the appearance of metal parts but also reduces corrosion protection. Blistering can be caused by a variety of factors, including improper pretreatment, imbalance in the composition of the galvanizing passivation solution, etc. Let's take a look at some of them in this issue.
Metal parts treated by the trivalent chromium colored zinc passivation process are often subjected to a salt spray test (also known as a salt spray test) to evaluate their corrosion resistance. The salt spray test is an accelerated corrosion test method that is widely used to evaluate the corrosion resistance of coatings, metals and other materials in marine or saline environments.
