Compared with other galvanizing processes, cyanide galvanizing requires a lower standard of substrate cleaning before plating. However, in the current trend of improving the quality grade of cyanide zinc plating layer, some pollutants are brought into the plating tank. Obviously become something harmful. Since cleaning the galvanizing layer is time-consuming and reduces production, proper cleaning and effective rinsing of the substrate prior to plating is very important.
Defects such as surface film and surface inclusions can be found and treated by conventional techniques in order to remove them locally from the surface of the sedimentary layer. Excess foam is formed when soap and surfactants such as saponified fats are brought into the tank. Moderate rates of foam formation may be harmless. The presence of a large number of small homogeneous particles in the tank can stabilize the foam layer, but the accumulation of too many solid particles can cause an explosion.
Using activated carbon mat to remove surface active substances, or through filtration to make the foam is not too stable, this is an effective measure; Other measures should also be taken to minimize the introduction of surfactant. The electroplating speed of large coils of galvanized wire was obviously reduced by the addition of organic matter. Although chemical formulations facilitate high deposition rates, the deposition of organic matter does not meet the requirements of coating thickness, so activated carbon can be used to treat the bath.
Post time: 26-09-21