Abstract

The morphology of anodic deposits on zinc was studied by scanning electron microscopy and potentiostatic techniques. The anodic film structure for zinc-steel couples in sea water is a porous three-dimensional network of discrete single crystal plates of ZnO. The individual ZnO crystals observed are 10–100 μm dia., with 10 8 plates/cm 2 of anode surface. The crystallites develop with hexagonal basal planes parallel to broad plate surfaces, as the result of an apparent dissolution-precipitation mechanism, with limited electrochemical effects on the basic morphology. Details of the plate morphology and implications regarding defect structure and growth mechanisms are discussed.

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