کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
192361 459739 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical corrosion behavior of chromium–phosphorus coatings electrodeposited from trivalent chromium baths
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical corrosion behavior of chromium–phosphorus coatings electrodeposited from trivalent chromium baths
چکیده انگلیسی

Chromium–phosphorus (Cr–P) coatings are electrodeposited from trivalent Cr (Cr(III)) 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(III) 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 microscopy (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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 53, Issue 24, 15 October 2008, Pages 7344–7349
نویسندگان
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