Abstract
The coating quality and corrosion resistance of steel sheets hot-dip galvanized by the conventional method in a semiautomatic plant were studied. The effect of various treatment processes such as surface pretreatment, dipping techniques and post-treatment processes on the coating quality, type and extent of defects was investigated. It was found that the coating quality was markedly influenced by the mode and the amount of zinc bath additives, in particular aluminium or antimony. The required amounts of such additives should be added at intervals in the form of binary zinc master alloys with a maximum aluminium or antimony content of 10%. The correlation of the bath temperature and the withdrawal speed with the sheet thickness is an important factor for quality improvement. The corrosion rate and electrochemical behaviour of sheets galvanized in a pure zinc bath and in baths containing various amounts of aluminium or antimony (0.02–0.1 wt.%) were examined in 1 N NaCl solution. Addition of aluminium or antimony slightly increases the corrosion resistance of the galvanized steel sheets. The corrosion resistance increases in the following order: pure zinc < ZnAl < ZnSb.
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