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Effects of iron ion contents on composition, morphology, structure and properties of chromium coatings electrodeposited from novel trivalent chromium sulphate electrolyte
Ist Teil von
Transactions of the Institute of Metal Finishing, 2012-03, Vol.90 (2), p.86-91
Ort / Verlag
Taylor & Francis
Erscheinungsjahr
2012
Link zum Volltext
Quelle
AUTh Library subscriptions: Taylor & Francis Journals
Beschreibungen/Notizen
Chromium coatings were electrodeposited from a novel trivalent chromium sulphate electrolyte using oxalate as the complexing agent. Energy dispersive spectroscopy, Scanning electron microscopy, X-ray diffraction, Tafel curve, and X-ray photoelectron spectroscopy techniques were used to characterise the compositions, surface morphologies, structures, corrosion resistances, and element chemical states of the coatings. The effects of Fe
2+
ions were investigated in detail. Results show that the small amount of iron ions generated coatings containing iron. The coating obtained is actually a Cr-Fe alloy of solid solution structure and microcrack surface morphology. X-ray photoelectron spectroscopy study revealed that a thin Cr(III) oxide film was formed on the surface of the coatings, and Cr(s) and Fe(s) states were observed within the coatings. As Fe
2+
ion contents were increased in the electrolyte, the iron content of the coatings significantly increased. The electrodeposited coatings exhibited a crack-free surface morphology when Fe weight content exceeded 30·1%. The coating with 26·3 wt-%Fe had an amorphous structure and the lowest electrochemical activity.