Product/metal ratio (PMR):A novel criterion for the evaluation of electrolytes on micro-arc oxidation (MAO) of Mg and its alloys  

作　　者：SONG LaiWen SONG YingWei SHAN DaYong ZHU GuoYi HAN EnHou 

机构地区：[1]State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [2]State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Science China(Technological Sciences)》2011年第10期2795-2801,共7页中国科学（技术科学英文版）

基　　金：supported by the National Key Technology R&D Program (Grant No. 2011BAE22B05);the National Natural Science Foundation of China (Grant No. 50901082)

摘　　要：Product/metal ratio (PMR) was introduced as a novel criterion for the evaluation of electrolytes on micro-arc oxidation (MAO) of Mg and its alloys. The criterion initially sprang from Pilling-Bedworth ratio (PBR), focused on the roles of electrolytes for the compactness of the fabricated coatings, and took attention on properties of reactants/products during MAO. Meanwhile, based on our experiments as well as the results from literatures, the effects of electrolyte additives on morphologies and com-positions of the fabricated MAO coatings of Mg alloys were exploited for verification and supplement of the initial criterion. In combination of the initial PMR criterion and experimental verification, PMR could be represented by special mode (PMRs=Voxide products/Valloy substrates) and general mode (PMRg= PMRs+ PMRd). The ideal PMRs should be between 1 and 2, while PMRd is related to the coating deposition during MAO. PMRd is a supplement to PMRs when the effect of the overlaying prop-erty (O) of the coatings and the effective deposition (D) of electrolyte composites are considered (PMRd=f(O, D). O is related to the melting point (MP) and boiling point (BP) of the MAO products. D is related to the effective reactions between alloy substrates and electrolytes during MAO.

关 键 词：micro-arc oxidation Mg alloys Pilling-Bedworth ratio product/metal ratio 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TN959.6[金属学及工艺—金属学]