Abstract
SUMMARYStudy of the microstructure of chromated zinc surfaces has shown that visual changes during corrosion tests may be attributed to the corrosion of the zinc substrate. The beginning of the corrosion process of chromated zinc surfaces is the appearance of black and white spots visible with the naked eye. The black spots are fine-dispersion products of zinc corrosion, which accumulate in the pores of the conversion coating and migrate to the surface. The black products of zinc corrosion are present as a super-fine dispersion (<10 nm). White products of zinc corrosion crystallise on the surface of the black spots. Both black spots and stains are indicators of uniform corrosion whereas white spots indicate crevice corrosion.
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