Acid galvanizing brightener application process, passivation after galvanizing mainly blue and white passivation, colored passivation, and colored passivation sometimes appear film and substrate bonding force is poor, easy to strip the film, this is how it is?
1, galvanizing process current density is too high. In the production process, sometimes in order to improve productivity, shorten the plating time, will adjust the current. And some people will also be attached to the cathode movement, which improves the deposition speed, but easy to cause the plating layer with too many organic impurities, resulting in a brittle coating. In this way, after color passivation, the passivation film is easy to fog, no luster, poor bonding. Therefore, try not to open the high current and cathode movement.
2, Too much organic matter in the galvanized layer. Some manufacturers in order to increase the brightness of the galvanized layer, frequent addition of acidic galvanizing brightening agent, making the brightening agent in the plating solution is too high, and some brightening agent itself has a high content of surfactant, making the production of the plating layer is very easy to entrain organic matter. This time will make the passivation film bonding force is poor, but also easy to produce peeling and discoloration.
3、Water washing is not clean. Acid galvanizing on the post-plating treatment requirements are more stringent, especially the water washing. Organic film adsorbed on the surface of the workpiece should be cleaned as much as possible in order to ensure that the passivation film bonding force is good.
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