铝合金微弧氧化膜纳米TiO_2掺杂机理研究  

Doping Mechanism of Nano TiO_2 in Micro-arc Oxidation Coating on Aluminum Alloy

作　　者：王平[1] 伍婷[1] 李杰[1] 贾昕昊 龚成龙[1] 郭小阳[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《稀有金属材料与工程》2017年第2期479-483,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);国家级大学生创新创业训练计划资助项目(201410615021);四川省高等学校油气田材料重点实验室资助项目(X151514KCL05)

摘　　要：在含有纳米TiO_2的电解液中对铝合金进行微弧氧化处理,用以研究掺杂纳米TiO_2对铝合金微弧氧化成膜机理及性能的影响。利用扫描电镜(SEM)观察微弧氧化膜形貌,能谱仪(EDS)分析膜层Ti、Al、O等元素含量,X射线衍射仪(XRD)分析相组成,测定膜厚、硬度和氧化液中TiO_2表面电荷,建立了掺杂改性模型。结果表明,加入纳米TiO_2后,氧化初期电压随TiO_2添加量增加逐渐升高、5min后电压逐渐降低;氧化膜表面孔洞数量和尺寸减小,成膜效率、膜层致密度和表面疏松层硬度提高。纳米TiO_2在氧化膜表面均匀分布,截面不均匀分布。氧化膜主要由γ-Al_2O_3、Mullite和少量Si组成。Aluminum alloy was micro-arc oxidized in nano TiO2 electrolyte and then the effect of nano TiO2 doping on properties and forming mechanism of micro-arc oxidation coating was investigated.Surface morphologies of the coating were observed by SEM,the content of Ti,Al and O was analyzed by EDS,and phase composition was identified by XRD.Thickness and hardness of the micro-arc oxidation coating and surface charge of nano TiO2 in electrolyte were measured.Then the doping modification model was established.The results show that the oxidation voltage increases initially with increasing TiO2 amount,and then declines after 5 min.The holes on the oxidation coating surface are decreased in number and size.The formation efficiency and compactness of the coating increase,as well as the hardness of surface porosity coating.The nano TiO2 is distributed homogeneously on the oxidation coating surface,while inhomogeneously on cross-section.The oxidation coating is composed of γ-Al2O3,mullite and a little Si phase.

关 键 词：铝合金 微弧氧化 纳米TIO2 掺杂机理 

分 类 号：TG174.4[金属学及工艺—金属表面处理]