As a widely used surface treatment technology, electroless nickel plating is very popular in many industrial fields due to its good performance. However, the process of electroless nickel plating may also produce some defects that can affect the quality of the coating and its performance. Understanding these defects is essential to ensure the performance of the final product.
Some customers inquired that in the production process of using black zinc passivator, the appearance of the workpiece passivation film is obviously black and shiny, but soon after drying, the passivation film will appear the phenomenon of small white spots, what is the reason for this?
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?
Some customers inquired that in the production process of using acid zinc brightener, the workpiece low concavity of the plating layer appeared to be dark and not bright phenomenon, what is the reason for this?
The zincate galvanizing process results in the appearance of pockmarks in the plating, which can be caused by several different factors. Pocking is a phenomenon of localized unevenness, roughness and bubbles on the surface of the plating, which may affect the overall appearance and corrosion resistance of the plating. Common causes include the following:
The tin plating additives used in the sulfate matte tin plating process have a direct impact on the quality of the plated layer, and the plated layer scratching is often related to the use and regulation of these additives. The type of additives, their concentration and their ratio in the plating solution will affect the final quality of the plated layer.
