Title: Corrosion Behavior of Micro-Arc Oxidation Coating on Magnesium Alloy AZ91D in Na_2SO_4 Solution
Abstract:Ceramic oxide coatings were prepared on AZ91D magnesium alloys in alkaline silicate electrolyte by a micro-arc oxidation(MAO) technique.The corrosion behavior of MAO coating on AZ91D magnesium alloys ...Ceramic oxide coatings were prepared on AZ91D magnesium alloys in alkaline silicate electrolyte by a micro-arc oxidation(MAO) technique.The corrosion behavior of MAO coating on AZ91D magnesium alloys in 0.1 mol/L Na2SO4 solutions with different NaCl concentrations was investigated by electrochemical analysis,scanning electron microscopy and X-ray diffraction,respectively.The results show that the MAO coating has a superior corrosion resistance in 0.1 mol/L Na2SO4 solution.The corrosion rate of the MAO coating increased with increasing chloride ions concentration in 0.1 mol/L Na2SO4+NaCl solution.The generalized corrosion was apparent on the MAO coating in the immersion initial stage.The localized corrosion occurred when the samples were immersed in 0.1 mol/L Na2SO4+3.5%NaCl solution for 120 h.The main corrosion products mainly consisted of Mg4(OH)6SO4·8H2O,MgSO4 and Mg(OH)2 in 0.1 mol/L Na2SO4 solution.There was MgCl2·2H2O as a corrosion product when Cl- was in the solution.Read More
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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