期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2014
卷号：3
期号：12
页码：18390
DOI：10.15680/IJIRSET.2014.0312086
出版社：S&S Publications
摘要：Alumina-based coatings are employed in many industrial applications, in order to protect the surface ofmetal components against high temperature, wear, corrosion and erosion. The corrosion deterioration process of plasmasprayed alumina coatings on AZ31B magnesium alloy was investigated using potentiodynamic polarization test inNaCl solution at different chloride ion concentrations, pH value and exposure time. Furthermore, an attempt was madeto develop an empirical relationship to predict the effect of pH value, chloride ion concentration and exposure time oncorrosion rate of plasma sprayed alumina coatings. The corroded surface was characterized by scanning electronmicroscopy (SEM) and X-ray diffraction (XRD). The results showed that the corrosion deterioration of alumina coatedmagnesium alloy in NaCl solutions was significantly influenced by chloride ion concentration and pH value. Thealumina coatings were found to be highly susceptible to localized damage, and could not provide an effective corrosionprotection to Mg alloy substrate in solutions containing acidic environments (pH3), higher chloride concentrations andexposure time.
