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摘要
In this work, Na3PO4 (0.05 M) and Na2B4O7 (0.02 M) were used as basic electrolytes for fabricating micro-arc oxidation coatings on ZK60 magnesium alloy. The effects of KOH concentrations (0.01, 0.05, and 0.1 M) on microstructure, chemical composition, and corrosion resistance were systematically investigated. The results revealed that MAO-coated samples prepared in 0.05 M aqueous KOH possessed relatively low thickness (8.82 mu m), small pore size (3.33 mu m), and the lowest porosity (5.156x10(-3) pores/mu m(2)). Also, there were no evident microcracks in MAO coatings prepared in 0.05 M aqueous KOH and the pore distribution was uniform. The resulting corrosion characteristics of MAO-coated ZK60 alloys in simulated body fluid solution (SBF) were significantly affected by the KOH concentration. ZK60 alloy coated with MAO prepared in 0.05 M KOH had relatively high self-corrosion potential (-1.28 V), highest polarization resistance (2667.23 k Omega.cm(2)), lowest corrosion current density (4.36x10(-7) A.cm(-2)), and low corrosion rate (1.00x10(-5) mm.yr(-1)), indicating the highest corrosion resistance in SBF and suggesting that MAO coatings prepared in 0.05 M KOH provided effective protection from corrosion for magnesium alloys.
- 出版日期2018-7
- 单位同济大学
