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.
First, a thorough pre-treatment is an important step. Prior to plating, metal surfaces undergo degreasing, pickling and washing to remove dirt, grease and surface oxidation. If these processes are not properly performed, the remaining impurities and oxides can prevent the passivate film from adhering to the electroplated zinc layer, resulting in possible loosening and blistering of the subsequent passivate layer.
Second, the composition of the passivation solution: the pH and concentration of the passivation solution need to be controlled. If the concentration of the galvanizing passivation solution is too high or the pH is inappropriate, the passivate film may form unevenly, with subsequent blistering. In addition, the use of an inappropriate passivator, or galvanizing passivation solution additives depleted without timely replenishment, may also lead to passivation film quality does not meet the requirements.
Plating factories need to control every aspect of the plating process, use Bigely galvanizing passivation solutions, and adjust the PH value and concentration according to the recommendations of the technical engineers, which can significantly reduce or avoid the problem of blistering of the passivation film, and thus improve the overall quality and performance of the plated parts.
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