Effect of Glycerin on Micro Arc Oxidation Process and Performance of Ceramic Coatings at the Surface of Magnesium Alloy AZ61
Effects of addition of glycerin in the electrolyte on the micro arc oxidation process have been investigated with a bipolar asymmetric pulse power supply, which involves peak value of pulse current, voltage, thickness and hardness of ceramic films of AZ61 magnesium alloy as well as surface roughness and structures. The results reveal that addition of a proper amount of glycerin helps to the decrease of positive pulse current peak and voltage, formation of a much dense ceramic coating with increase of the hardness, decrease of the surface roughness and good crystallization. When the amount of glycerin is more than 10ml/l, the growth of ceramic coatings begins to be inhibited and the performance of ceramic coatings seriously turns worse.
Kai Cheng, Yingxue Yao and Liang Zhou
L. Q. Li et al., "Effect of Glycerin on Micro Arc Oxidation Process and Performance of Ceramic Coatings at the Surface of Magnesium Alloy AZ61", Applied Mechanics and Materials, Vols. 10-12, pp. 396-400, 2008