摘要
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。
A vanadium doped aluminum alloy micro-arc oxidation （MAO） coating was prepared by adding ammonium vanadate in electrolytes. The influences of different adding concentration on the performance and structure of aluminum alloy MAO coating were studied. Surface morphologies of the coating were observed by SEM, V and O element contents on the MAO coating were analyzed by EDS, valence state of V and O element was determined by XPS, phase composition was analyzed by XRD and corrosion resistance was evaluated by polarization curve. The results show that VO3- transforms into V2O5 when the micro-arc discharges area temperature is above 1714.38 K. The formation of porous coating on the surface of MAO coating is restrained by the V2O5 of low melting point which melt firstly due to the effect of electric arc. Vanadium doping affects the phase composition of the MAO coating a little and it is helpful to improve the thickness and corrosion resistance of the coating
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第7期1759-1763,共5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)
关键词
微弧氧化
铝合金
钒掺杂
耐蚀性
micro-arc oxidation
aluminum alloy
vanadium doping
corrosion resistance
