Abstract
A black trivalent chromium conversion coating (CCC) was obtained on Zn deposit in chromium trichloride solution at 55 °C. The formation process of trivalent CCC on Zn deposit were thoroughly investigated by using X-ray fluorescence spectrometer and X-ray photoelectron spectroscopy in combination with atomic force microscopy surface analysis. The trivalent CCC on Zn deposit is consisted of Zn, Cr, O, Ni, Co, P and N elements, with visible micro-cracks on the film’s surface. The growth rate, the surface color and the morphology of this conversion coating vary with the dipping time.
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