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通过在电解液中添加NH4VO3制备了钒掺杂铝合金微弧氧化层,研究了不同添加浓度对铝合金微弧氧化层结构和性能的影响。利用扫描电镜(SEM)观察微弧氧化层表面形貌,能谱(EDS)仪分析了膜层V、O元素含量,XPS测定V、O元素的价态,X射线衍射(XRD)仪分析了相组成,极化曲线评定了耐蚀性。结果表明,微弧放电区温度高于1714.38K时?3VO开始转变形成V2O5,低熔点的V2O5在电弧作用下优先熔化而抑制了微弧氧化层表面多孔层的形成。钒掺杂对微弧氧化层相组成影响较小,有利于提高膜层的厚度和耐蚀性。
The micro-arc oxidation of vanadium-doped aluminum alloy was prepared by adding NH4VO3 to the electrolyte. The effects of different concentrations on the structure and properties of micro-arc oxidation of aluminum alloy were investigated. The surface morphology of MAO coatings was observed by scanning electron microscopy (SEM), the contents of V and O were analyzed by EDS, the valences of V and O were determined by XPS. The XRD patterns were analyzed by X-ray diffraction Phase composition, polarization curve evaluated corrosion resistance. The results show that when the temperature of micro-arc discharge zone is higher than 1714.38K, 3VO begins to change into V2O5, and V2O5 with low melting point preferentially melts under the action of arc to suppress the formation of porous layer on the surface of microarc oxidation layer. Vanadium doping has little effect on the micro-arc oxidation layer phase composition, which helps to improve the film thickness and corrosion resistance.