【摘 要】
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Anodizing is an effective technique to modify the surface properties of magnesium alloy and improve its corrosion resistance to widen its application in different industrial fields. By using environme
【机 构】
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College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, P.R. China;Sc
【出 处】
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第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
Anodizing is an effective technique to modify the surface properties of magnesium alloy and improve its corrosion resistance to widen its application in different industrial fields. By using environmental friendly electrolytic anodizing process, protective coatings were formed on AZ31 magnesium alloys. The effect of Na2SiO3 as one of the electrolytic components on the anodic film was researched. The morphology and composition of the anodic films were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The corrosion behavior of the anodized specimens in 3.5wt.% sodium chloride solutions was assessed by potentiodyn mic polarization and electrochemical impedance spectroscopy (EIS). The results indicated that the surface morphology and corrosion resistance of the anodized film are strongly dependent on the Na2SiO3 concentration. With the increase of the concentration, the anodic film become more compact and its corrosion resistance is significantly improved. When the Na2SiO3 concentration in the electrolyte is 90g/L, the anodic film is the most compact and uniform and has the best corrosion resistance.
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