The corrosion behavior of thermally sprayed Al-Zn alloy coatings immersed in NaCl aqueous solution was determined by using electrochemical impedance spectroscopy. Ohmic resistance and capacitance of the corrosion product film formed on the sprayed coating surface, and the corrosion resistance and electric double layer capacitance at the interface between the sprayed coating and the solution were evaluated. As immersion time in NaCl solution increased, the corrosion rate of the Al-2mass%Zn coating increased, but the corrosion rate for Al-6mass%Zn and Al-15mass%Zn coatings decreased due to the influence of the corrosion product.

aluminum-zinc alloys, electric charge transfer resistance, electrochemical impedance spectroscopy, film ohmic resistance, sodium chloride, thermal spraying
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2011
DVS Media GmbH
Topics
Aluminum-zinc alloys Thermal spray coating Electrical properties Electrochemical impedance spectroscopy
Issue Section:
Characterization and Testing
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