硼稀土共渗钛合金的耐蚀性研究  

Corrosion Resistance of Rare Earth-Borided Titanium Alloy

作　　者：李凤华[1] 衣晓红[2] 樊占国[1] 张景垒[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《东北大学学报（自然科学版）》2013年第2期261-264,共4页Journal of Northeastern University(Natural Science)

基　　金：中央高校基本科研业务费专项资金资助项目(N110402004)

摘　　要：采用不需保护性气氛的固体粉末法对Ti6Al4V(TC4)合金表面进行稀土与硼共渗,并对硼稀土共渗TC4钛合金、单渗硼TC4钛合金及未经渗硼处理的TC4钛合金基体,分别在3.5%NaCl和5%H2SO4(质量分数)溶液介质中进行了腐蚀实验.X射线衍射分析表明,TC4表面渗层由TiB2和TiB组成.扫描电镜观察表明,外层的TiB2具有平坦的生长前沿,而内层TiB为锯齿状形貌;其中外层的TiB2内部存在少量针孔,分析认为是Ce原子与B原子共渗时产生的Kirkendall效应所致.Tafel极化曲线分析结果表明,在3.5%NaCl和5%H2SO4溶液介质中,各样品的耐蚀性大小排序为单渗硼TC4钛合金>硼稀土共渗TC4钛合金>未经渗硼处理的TC4钛合金.Rare earth and B atoms were penetrated into Ti6Al4V（TC4） alloy surface using the solid powder technique without protective atmosphere.The rare earth-borided,borided and TC4 alloys were corroded in the 3.5wt% NaCl and 5wt% H2SO4 solutions,respectively.The X-ray diffraction analysis shows that the borided layer on the TC4 surface is composed of TiB2 and TiB.Scanning electron microscopy study shows that the outer TiB2 layer has a flat growth front,while the inner TiB layer appears serration.Some pinholes present in the outer layer,which may be due to the Kirkendall effects caused by the co-diffuse of Ce and B atoms synchronically.The Tafel polarization curve shows that,in the 3.5wt% NaCl and 5wt% H2SO4 solution,the corrosion resistance of the samples follows the order of borided,rare earth-borided and TC4 alloy.

关 键 词：TI6AL4V合金 渗硼 稀土催化 耐蚀性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]