The effect of processing parameters and substrate composition on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloys

摘要: Abstract Magnesium alloys are considered one of the more promising materials for future use in many engineering applications. However, due to their high chemical and electrochemical reactivity, magnesium have poor corrosion resistance aqueous environments. Improving by coating can greatly extend application. One method is plasma electrolytic oxidation (PEO). The nature formed, ultimate performance depends on both processing parameters (electrolyte, current density, mode, time) specific Mg-alloy substrate. In present study, PEO coatings were produced three different Mg-alloys (AJ62, AM60B AZ91D) using parameters. Scanning electron microscopy was used characterize coatings. evaluated impedance spectroscopy (EIS) an 3.5% NaCl solution. Relationships drawn between parameters, substrate composition performance. Electrochemical data indicate that bipolar coated AZ91D Mg alloy demonstrates a higher when compared AM60B, AJ62 pure Mg.