Ti对部分晶化Ni基非晶合金电化学腐蚀性能的影响  

Effect of Titanium on Corrosion Behavior of Ni-Based Bulk Metallic Glasses with Partially Crystallized Structure

作　　者：檀朝桂[1] 蒋文娟[1] 吴学庆[1] 林建国[1] 

机构地区：[1]湘潭大学材料与光电物理学院,湖南湘潭411105

出　　处：《稀有金属》2007年第4期462-466,共5页Chinese Journal of Rare Metals

基　　金：湖南省杰出中青年基金研究计划项目资助(02JJYB010)

摘　　要：采用水冷铜模吸铸法制备出部分晶化的Ni55Nb30Sn5Ti5Zr5和Ni55Nb30Sn5Zr10块体非晶合金,并利用X射线衍射(XRD)分析和示差扫描量热仪分析(DSC)对合金的相组成及热物性参数进行了测量分析。采用极化曲线法研究合金在不同溶液中的腐蚀行为,并利用失重法测定合金在10%HCl溶液中的腐蚀速率,对腐蚀后的显微形貌及表面成分进行了扫描电镜(SEM)观察和能谱分析(EDS)。结果表明,Ni55Nb30Sn5Ti5Zr5合金比Ni55Nb30Sn5Zr10合金具有更宽的过冷液相区和更好的抗腐蚀性能。随着合金晶化相的增多,合金抗腐蚀性能降低。Ti元素的加入可在合金表面形成氧化钛的保护膜,从而使合金的抗腐蚀性能提高。Ni55Nb30Sn5Ti5Zr5 and Ni55Nb30Sn5Zr10 bulk metallic glasses（BMGS）with the partially crystallized structure were obtained by water-cooled copper mold casting.The microstructure and thermal properties of the alloys were investigated by means of XRD and DSC,and electrochemical measurements were carried out in 10%HCl and 10%HNO3 aqueous solution by potentiodynamic polarization method at room temperature.The results showed that Ti additions to the alloys could promote the glass forming ability and improve the corrosion resistance in the two solutions.With the increasing content of crystallized phase,the corrosion resistance decreased.A film of Ti oxide could be formed on the surface of the alloy containing Ti during the corrosion process,which might improve the corrosion resistance of the alloy.

关 键 词：NI基非晶合金 晶化 电化学 腐蚀行为 

分 类 号：TG174[金属学及工艺—金属表面处理]