Study on development of key technology of potassium chloride roll-galvanizing
A potassium chloride roll-galvanizing bath was changed into two roll-galvanizing bathes by adding a partition in the middle of the bath.The ferrous impurity in the first plating bath was regarded as the effective component,and the zinc plating was changed to zinc-iron alloy plating.Thereby,the main source of ferrous impurity was cut off,and the second bath was used to prepare for high quality galva-nized layers.In the first plating bath,zinc-iron alloy plating was carried out on steel parts to prepare for the bottom coating,and then galvanizing was done in the second bath to obtain surface coating,which eliminated the adverse effects of iron impurities on potassium chloride galvanizing and overcame the technical defects of the traditional process such as barrel roll hole marks and passivation difficulty.The process did not need to deal with iron impurity in the potassium chloride galvanized bath,so it solved the problem of performance decrease in the bath after treating by hydrogen peroxide oxidation.The test shows that corrosion resistance of the composite coating using zinc-iron alloy plating and galvanizing is higher than that of the traditional galvanized coating.The bath is simple to maintain,the properties of the bath and coating are better than that of the traditional process,so it has a good application prospect.
potassium chloride roll-galvanizingthe first electroplating baththe second electroplating bathferrous ionzinc-iron alloy coatinggalvanized coating
万方数据
维普
