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Electrochemical corrosion behavior of arc sprayed Zn-Al coatings
Authors:LIU Yan  ZHU Zi-xin  CHEN Yong-xiong  XU Bin-shi  Ma Shi-ning  LI Zhuo-xin
Abstract:Cored wires and high velocity arc spraying (HVAS) technique were applied to produce high Al content Zn-Al alloy coatings on low carbon steel substrates. The electrochemical corrosion behaviors of Zn, Al and Zn-Al coatings were studied with potentiodynamic measurement in 5 % NaCl solution. Compared with pure Zn, pure Al and Zn-15Al coatings, Zn-26Al coatings show a higher corrosion resistance in salt solution. The potentiodynamic polarization tests show that the corrosion resistance of Zn-Al coatings increases as Al content is raised. Pure Al coating exhibits different electrochemical behaviors with other coatings. The corrosion initiated at the micro-pores of the coating and the underlying corrosion mechanism is very similar to that of the pitting corrosion.
Keywords:coating  electrochemical corrosion  high velocity arc spraying  potentiodynamic polarization
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