Ti元素对工业级Zr-Ti合金电化学腐蚀行为的影响  

Effect of Ti Element on Electrochemical Corrosion Behavior of Industrial Zr-Ti Alloy

作　　者：魏统宇 樊蕾 袁波 严宝辉 田锋 范清松 刘海明 WEI Tongyu;FAN Lei;YUAN Bo;YAN Baohui;TIAN Feng;FAN Qingsong;LIU Haiming(Xi′an West New Zirconium Technology Co.,Ltd.,Xi′an 710016,China;Zhonghe(Tianjin)Machinery Co.,Ltd.,Tianjin 300399,China)

机构地区：[1]西安西部新锆科技股份有限公司,西安710016 [2]中核(天津)机械有限公司,天津300399

出　　处：《有色金属工程》2024年第10期31-38,共8页Nonferrous Metals Engineering

基　　金：陕西省技术创新引导计划(2022CGKC-03);中国原子能“燎原计划”科研项目(20221101)。

摘　　要：通过恒电位极化曲线法研究了工业级Zr-xTi(x=0、5、10、15)合金板材在6 mol/L的亚沸腾态浓硝酸环境中的电化学腐蚀行为。通过测试材料的动电位极化曲线和电化学阻抗谱等电化学参数来评价不同Ti含量Zr-Ti合金的腐蚀性能,并利用扫描电子显微镜(SEM)和3D超景深显微镜对材料腐蚀形貌进行观察。结果表明:添加Ti元素可以减小合金材料的自腐蚀电流密度I_(corr),提高合金材料表面的电荷转移电阻R_(ct),对材料的耐腐蚀性能有利;当Ti含量添加至5%,有明显的钝化区间,合金材料具有最小的自腐蚀电流密度I_(corr),约为4.0923×10^(-6)A/cm^(2),电荷转移电阻R_(ct)也最大,约为16514Ω·cm^(2),并且其合金表面氧化膜光滑平整,腐蚀程度最弱,表明Zr-5Ti合金材料的腐蚀速率较低,具有优异的耐硝酸腐蚀性能。In this study,the electrochemical corrosion behavior of industrial Zr-x Ti(x=0,5,10,15)alloy plate in 6 mol/L sub-boiling concentrated nitric acid environment was studied by potentiostatic polarization curve method.The corrosion properties of Zr-Ti alloys with different Ti contents were evaluated by testing electrochemical parameters such as potentiodynamic polarization curve and electrochemical impedance spectroscopy,and the corrosion morphology of the materials was characterized via scanning electron microscope(SEM)and 3D ultra-depth microscope.The experimental results show that adding Ti element can reduce the self-corrosion current density I_(corr)of alloy materials and increase the charge transfer resistance R_(ct)on the surface of alloy materials,which is beneficial to the corrosion resistance of materials.When the Ti content is 5%,there is an obvious passivation interval.The alloy material has the smallest self-corrosion current density I_(corr),which is about 4.0923×10^(-6)A/cm^(2),and the largest charge transfer resistance R_(ct),which is about 16514Ω·cm^(2).The oxide film on the alloy surface is smooth and flat,and the corrosion degree is the weakest,indicating that the corrosion rate of Zr-5Ti alloy material is low and it has excellent nitric acid corrosion resistance.

关 键 词：乏燃料后处理 锆合金 浓硝酸 电化学腐蚀 腐蚀形貌 

分 类 号：TG139[一般工业技术—材料科学与工程] TG174[金属学及工艺—合金]