Abstract
Microarc oxidation (MAO) surface modification course on high-purity Mg at constant DC and the resultant ceramic coatings were investigated. MAO was the course in which the pre-existing film/coating was modified or substituted and strengthened repeatedly. SEM disclosed the inhomogeneous formation rate of ceramic coating in different micro-regions at anode surface during MAO. Three-stage behavior of MAO including pre-microarc discharge stage, transitional stage and then further modifying stage was put forward. The latter two stages proceeded under continuous discharge conditions, accompanied by intensive evolution of gas. EDS analyses indicated that the resultants of MAO consisted mainly of Mg, O and Si elements. XRD analyses revealed the dependence of phase composition on treatment time and coating layer depth.
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