摘要
为了研究ZL108铝合金微弧氧化膜的Na2Mo O4改性机理,在添加5种不同浓度的Na2MoO4溶液中对其进行微弧氧化处理。利用扫描电镜(SEM)观察微弧氧化膜表面形貌,用能谱仪(EDS)分析截面Mo、O元素含量,用XPS测定Mo、O元素的价态,用X射线衍射仪(XRD)分析相组成,采用极化曲线评定耐蚀性。结果表明,微弧氧化电压随着Na2MoO4浓度的增加而下降。微弧放电区温度高于1823.84 K时,Mo O2-4开始转变形成MoO2,抑制了微弧氧化膜表面多孔层的形成,提高了膜层的致密性、厚度和耐蚀性。浓度的改变对相组成影响较小。
In order to research the Na2MoO4 modifying mechanism of micro-arc oxidation（MAO） coating on ZL108 aluminum alloy, the alloy was treated by MAO in an electrolyte with Na2MoO4 addition of 5 kinds of concentration. Surface morphologies, Mo and O elements content on cross-section of MAO coating, valence state of Mo and O element, phase composition and corrosion resistance of MAO coating were analyzed by SEM, EDS, XPS, XRD and polarization curve, respectively. The results show that the oxidation voltage declines with the Na2MoO4 concentration increasing. The MoO2-4 begins to transform to MoO2 when the temperature of micro-arc discharges area is above1823.84 K, and MoO2 strains the formation of porous coating on the surface of MAO coating. Therefore, the compactness, thickness and corrosion resistance of MAO coating are improved. In addition, the effect of Na2MoO4 concentration on the phase composition of MAO coating is not obvious.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第5期1191-1196,共6页
Rare Metal Materials and Engineering
基金
油气藏地质及开发工程国家重点实验室(西南石油大学)资助项目(PLN1307)
四川省教育厅重点资助项目(12ZA293)
西南石油大学校级基金资助项目(2012XJZ015)
