Al 2O 3–ZrO 2 mixed oxide composite incorporated aluminium rich zinc coatings for high wear resistance

Abstract

Corrosion resistance and wear resistance are the two important parameters for high performance of zinc galvanic coating. In the present work, the improvement of these two characteristics was achieved by the incorporation of Al 2O 3–ZrO 2 mixed oxide composite in the coating. Al 2O 3–ZrO 2 mixed oxide composite was synthesized from ZrOCl 2·8H 2O. Aluminium rich zinc coatings with high sliding wear resistance was developed from a galvanic bath containing the mixed oxide. Based on the performance of the coating during physicochemical and electrochemical characterization, the concentration of mixed oxide composite in the bath was optimized as 0.50 wt% Al 2O 3–0.50 wt% ZrO 2. While rich in Al–metal content in the coating caused high corrosion resistance, the incorporation of the mixed oxide improved structural characteristics of the coating resulting in high wear resistance also. The coating was nonporous in nature and even the interior layers had high stability. The coatings have potential scope for high industrial utility.