Effect of Electrical Parameters on Energy Consumption and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg-alloy
Micro-arc oxidation(MAO)can improve the corrosion resistance of Mg-alloys,but it has the deficiency of high energy consumption,which restricts its large-scale application on Mg-alloy compo-nents.In order to reduce the energy consumption of micro-arc oxidation,micro-arc oxidation coatings were prepared on the surface of AZ31B Mg-alloy in an electrolyte of Na2SiO3 20 g/L,NaOH 2 g/L and NaF 2 g/L by pulsed power supply,and the effects of electrical parameters(frequency,duty cycle and cur-rent density)on the unit energy consumption and corrosion resistance of the coatings were studied by means of scanning electron microscopy,electrochemical testing and salt spray test.The results show that the frequency has less effect on the unit energy consumption of the coatings,but the higher the fre-quency,the better the corrosion resistance of the coatings;the duty cycle has more obvious effect on the energy consumption,with the increase of the duty cycle,the unit energy consumption of the coatings de-creases,but the corrosion resistance decreases;the current density also has a significant influence on the energy consumption,the higher the current density,the higher the unit energy consumption of the coatings,but the change of current density has less effect on the corrosion resistance of the coatings.
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