热氧化对Zr基块体金属玻璃腐蚀行为的影响  

Effect of Thermal Oxidization on Corrosion Behavior of Zr-based Bulk Metallic Glass

作　　者：彭盛[1] 曹庆平[1] 赵向南[1] 王晓东[1] 蒋建中[1] 

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310027

出　　处：《材料科学与工程学报》2017年第3期345-351,共7页Journal of Materials Science and Engineering

基　　金：国家重点基础研究发展计划资助项目(973)(2012CB825700);国家自然科学基金资助项目(51371157;U14321056);浙江自然科学基金资助项目(Z1110196;LY15E010003);中央高校基本科研基金资助项目(2016FZA4006)

摘　　要：本文系统研究了空气中热氧化对Zr-Cu-(Nb)-Ag-Al-Be块体金属玻璃在含Cl^-溶液中腐蚀行为的影响。热氧化后:样品表面生成0.3~0.4μm厚的氧化层,层内Al和O富集;含Nb样品点蚀电位和自然腐蚀电位明显增大,不含Nb样品极化曲线却无明显变化;浸泡实验中样品表面的腐蚀坑密度显著降低,腐蚀坑内Cu富集、Zr贫化。X射线光电子能谱结果显示热氧化后含Nb样品表面含有Nb_2O_5和更低的Cu含量,而其它元素与不含Nb样品相似。因此,热氧化能更显著地改善含Nb样品耐蚀性能的原因可能是含Nb_2O_5的氧化膜更加致密,以及该氧化层能更有效阻碍Cl^-扩散。Influence of thermal oxidization on corrosion behavior of Zr-Cu-（Nb）-Ag-Al-Be bulk metallic glasses（BMGs）in Cl^- contained solution were systematically studied.After thermal oxidization：thickness with 0.3~0.4μm and Al,O enriched oxide layer were formed at surface;corrosion potential and pitting potential of Nb-contained BMG were evidently enhanced,while Nb-free BMG did not show apparently change;surface pit density of BMGs in immersion test decreased and Cu was enriched and Zr depleted inside the pits.In Nb-contained surface,Nb2O5 existed and Cu content was low,but contents of other elements were similar to Nb-free BMG from X-ray photoelectron spectroscopy analyzes.Nb2O5-contained oxide film is denser and Cldiffusion was more effectively impeded,causing greater improvement of corrosion resistance of Nb-contained BMG after oxidation.

关 键 词：块体金属玻璃 腐蚀 热氧化 X射线光电子能谱 

分 类 号：TG139.8[一般工业技术—材料科学与工程]