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AZ31 Mg alloy were coated by Macro Arc Oxidation(MAO) with 3 types of electrolyte and various coating times at 4A/ ㎠ . The Surface morphology of coatings became lager pores and surface crack initiated as the coating time increased. The thickness and micro-hardness of coatings increased as the coating time increased. also. The phase of coatings on AZ31 alloy consisted of MgO, Mg 2 SiO 4 and MgAl 2 O 4 oxides. The salt spray corrosion resistance of coated AZ31 alloys revealed excellent corrosion resistance in 5% NaCl solution for 168hr. Key Word : Micro Arc Oxidation; Magnesium Alloy; AZ31; Ceramic Coating; Electrolyte        . * Corresponding Author : Tae-Haeng LeeTel: +82-10-8795-1094 email: thlee57@kongju.ac.kr 12 09 20  12 10 08  12 10 11 1.    1.74  ,       ,     ,        ,      Air conditioner, Wheel, Bumper       .               ,         Anodizing           .[1]                  ,      6          .[2]

Effects of Nitrate Electrolyte as the MAO process for Ceramic Coating treatments of AZ31 alloy