Abstract
It was found that the zinc layer electrodeposited from zinc sulfate bath containing a small amount of CrVI very high corrosion resistance. Being motivated by this finding, we studied the effects of CrVI in zinc sulfate bath on the zinc plating and on the properties of zinc layer by chemical analysis, X-ray diffraction analysis, electron probe microanalysis, infrared absorption spectroscopic analysis, and electron microscopic observation. The results obtained were as follows. (a) The abovementioned zinc layer contained amorphous hydrated chromic oxide finely dispersed in the layer. (b) The hydrated chromic oxide content of zinc layer increased with increase in the amount of CrVI in the bath and increase in pH value of plating bath; but it decreased with the rise in bath temperature and increase in current density. (c) The corrosion resistance of zinc layer was higher when the hydrated chromic oxide content of zinc layer was higher; but the appearance and adhesion of the layer became poorer when the oxide content was higher than a considerable value.
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