高pH值的硝酸铀酰溶液中碳钢腐蚀与沉积膜的特性  

Corrosion Behavior of Carbon Steel in High-pH Value Uranyl Nitrate Solution

作　　者：廖俊生[1] 孙颖[1] 丁平[1] 魏彦波[1] 蔡定洲[1] 

机构地区：[1]中国工程物理研究院,四川绵阳621900

出　　处：《材料保护》2003年第4期20-22,共3页Materials Protection

基　　金：中国工程物理研究院科学技术基金(20020542)

摘　　要：用均匀腐蚀法和电化学法研究了碳钢(A3)在pH值5.0的硝酸铀酰溶液中的腐蚀行为。均匀腐蚀试验结果表明,碳钢在pH值5.0硝酸铀酰溶液中发生非电化学腐蚀,使溶液酸度降低,导致铀酰离子水解,在碳钢表面形成了水合氧化铀沉积膜。动电位阳极极化试验结果显示,碳钢的腐蚀电位随扫描电位速率的增加向阴极方向移动,UO^2^(2+)的沉积对碳钢的阴极反应有抑制作用。均匀腐蚀后的样品,经XRD、XPS分析证实,沉积膜主要为铀酰离子的氧化物沉淀。General corrosion and electrochemical methods had been used to investigate the corrosion behaviors of carbon steel (A3) in uranyl nitrate solution at pH = 5.0. The corrosion results showed that the non-electrochemical corrosion of carbon steel enhanced UO22+ ion hydrolysis in the high-pH uranyl nitrate solution, and the deposit was formed on the surface of carbon steel. The potentiodynamic test results released that the corrosion potential of carbon steel shifted to the cathode with the increase of sweep rate, and the cathodic polarization was inhibited by deposit of u-ranyl ion. The deposit on the specimen was the oxide precipitate of uranyl ion characterized by XRD and XPS analysis.

关 键 词：腐蚀 高pH硝酸铀酰溶液 碳钢 表面分析 

分 类 号：TG172[金属学及工艺—金属表面处理]