期刊
ELECTROCHIMICA ACTA
卷 53, 期 24, 页码 7344-7349出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.03.081
关键词
Cr-P coatings; electrochemical corrosion; hypophosphite; passive film; trivalent Cr
Chromium-phosphorus (Cr-P) coatings are electrodeposited from trivalent Cr (Cr(Ill)) baths containing hypophosphite. The electrochemical corrosion behavior of Cr-P coatings, traditional Cr coatings deposited in hexavalent Cr (Cr(VI)) baths, and chromium-carbon (Cr-C) coatings deposited in Cr(Ill) baths containing formate are studied by measuring potentiodynamic polarization curves in a 10 wt% HCl solution. The composition and morphology of the coating surface layers are investigated by X-ray photoelectron spectrometry (XPS) and scanning electron rnicroscopy (SEM), respectively. The results of electrochemical tests show that Cr-P coatings exhibit better corrosion resistance than traditional Cr and Cr-C coatings, which is characterized by a lower critical current density, lower passive current density, and lager passive potential range. XPS and SEM analyses confirm that the excellent corrosion resistance of Cr-P coatings is attributed to the formation of a phosphide passive film, which has high stability and self-repairing ability, and can act as a buffer to reject the penetration of chloride ions. (c) 2008 Elsevier Ltd. All rights reserved.
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