The micro-arc oxidation ceramic layer was prepared by using the LA103 Zmagnesium-lithium alloy as the matrix in the silicate alkaline electrolyte

and its growth characteristics

microstructure and corrosion resistance were investigated.Micro-arc oxidation technique was used to prepare the coating layer at different current densities under constant oxidation time of 3 min

duty cycle of 10 and frequency of 500 Hz

.The micromorphology and thickness change of the ceramic coating were observed

respectively

by scanning electron microscope and coating thickness gauge.The corrosion performance of the coatings in 3.5% NaCl solution was analyzed by electrochemical workstation.At the same processing time

duty cycle and frequency

the increase of current density promotes the thickness increase of the ceramic layer with the maximum thickness of 25.65μm

and the weight increases of the coating with the maximum weight of 0.08 g

and the roughness of the coating layer is increased to 0.175μm.In addition

as the current density increases

the electrical insulation of the micro-arc oxidation coating layer presents more and more desirable

where the highest breakdown voltage can reach 0.63 V

and corrosion potential is positive than matrix at 27.8 A/dm

2

.