کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1661287 | 1008422 | 2008 | 6 صفحه PDF | دانلود رایگان |
To improve the anticorrosion resistance of chromium-free Zn–Al sintered coating, characteristics of chromate on zinc–aluminum–chromium were studied by electrochemical methods. Depth profiles of elements were obtained by glow discharge spectrum (GDS) and X-ray photoelectron spectroscopy (XPS) was used to analyse the chemical states of main elements in Zn–Al coatings. Corrosion behaviors of steel samples coated with chromium-free Zn–Al and zinc–aluminum–chromium exposed to seawater were investigated by using electrochemical impedance spectroscopy (EIS) measurement. Both in open circuit potential and EIS monitoring self-healing phenomena of chromate were obviously observed. The self-healing function endows zinc–aluminum–chromium coating with better anticorrosion performance. Electrochemical analysis show that self-healing action of coatings is missing when replace chromate with molybdate and silane.
Journal: Surface and Coatings Technology - Volume 202, Issue 24, 15 August 2008, Pages 5847–5852