Some customers said that they used alkaline galvanized production process, after the use of colored zinc passivator, they found that the workpiece will appear very serious discoloration phenomenon, resulting in the need to return the workpiece for rework, which caused great economic losses. So, what causes the coating of the workpiece to discolor?
To achieve a bluer trivalent chromium blue zinc passivate film color, some parameters in the passivation process need to be carefully adjusted. The following are some of the factors that may affect the color of the passivate film:
What is the cause of blistering in alkaline galvanizing process? In addition to the unclean pre-treatment stated in the previous article, you can also investigate from the following 4 directions.
In the field of hard chrome plating, the use of hard chrome additives is one of the key factors in optimizing the performance of the plating solution and enhancing the quality of the plated layer. The deep plating capability of the bath refers to the ability of the chromium layer to deposit uniformly in the deep concave parts of the workpiece during the plating process, and this attribute is crucial for parts with complex shapes, deep holes or slits. Additives directly affect the conductivity, ion distribution and current density of the bath, which in turn affects the deposition rate and quality of the plated layer.
Localized blistering of the plating is a common quality problem in the production of barrel nickel plating of iron parts, and the following are some of the common causes that may lead to such failures:
In the pyrophosphate copper electroplating process, the control of current density is critical because it directly affects the quality and morphology of the plated layer as well as the deposition rate. Too high or too low a current density can lead to problems with the plated layer, such as roughness, looseness, unevenness, and even defects such as cracks.
