标准盐雾环境下铀钛合金的腐蚀行为研究

Corrosion Behavior of U-Ti Alloy in Standard Salt Spray Environment

采用激光共聚焦显微镜(LSCM)、扫描电子显微镜(SEM)和X射线光电子能谱(XPS)技术研究了标准盐雾环境下铀钛合金表面腐蚀行为。结果表明,在标准盐雾条件下,铀钛合金表面发生不均匀腐蚀,腐蚀程度主要受附着的液膜厚度和暴露时间影响。铀钛合金早期以点蚀为主,液膜越厚腐蚀越严重。随着暴露时间的延长,腐蚀加剧,形成局域性的腐蚀,并出现腐蚀产物的开裂。对铀钛合金2种典型腐蚀区域U 4f谱的深度剖析表明,黑色区域的物质组成结构为U_3O_8/UO_(2+x)/UO_2/U,而黄色区域的物质组成结构为UO_(2+x)/UO_2/U。

Corrosion behavior of U-Ti alloys in standard salt spray environment was investigated by laser scanning confocal microscope（LSCM）, scanning electron microscope（SEM） and X-ray photoelectron spectroscopy（XPS）. Results show that U-Ti alloys present heterogeneous corrosion in the environment and corrosion extent of the alloys is mainly affected by the liquid film thickness and exposure time. Pitting corrosion is the main corrosion type for initial corrosion behavior of U-Ti alloys and corrosion extent is more grievous with the thicker liquid film and longer exposure time. Localized corrosion and the cracks of corrosion products occur on the surface of U-Ti alloy. The U 4f spectra of U-Ti alloys in two typical regions as a function of etching time show that the composition is U3O8/UO（2＋x）/UO2/U in the black region while the composition is UO（2＋x）/UO2/U in the yellow region.