The iron wire coating is rough and the passivation film is not bright.
Sometimes the iron wire in the galvanized, the coating is rough, the passivation film is not bright how to do?
Sometimes the iron wire in the galvanized, the coating is rough, the passivation film is not bright how to do?
First look at the phenomenon, if plating to top coating is rough, may be plated solid particles in liquid; if parts of the edge and tip roughness phenomenon is more serious, may the current density is too large; if the galvanized layer is good, but when a light in the 3% nitric acid, coating on the shadows, passivation layer of Brown may there is a copper or lead different metal impurities in zinc plating bath.
This kind of fault occurs, first check the temperature and current density, and then through the analysis of plating liquid, determination and adjust the content of zinc and sodium hydroxide solution plating, DPE content is on the low side can by Hull cell test. If coating roughness are not the causes, it may is plating liquid impurities caused, can take a bath, do I test after being filtered, and then take a small amount of plating solution, the experiment with zinc powder processing, fault inspection is induced by different solid particles or copper, lead metal impurities, item by item test, the cause of the trouble would not be difficult to find.
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