海洋大气环境下TC4钛合金与316L不锈钢铆接件腐蚀行为研究

研究了TC4-316L异种金属铆接件在模拟海洋大气环境条件下的腐蚀行为。利用失重法、X射线光电子能谱分析(XPS)、扫描电子显微镜(SEM)、激光共聚焦显微镜等方法分析了试样的腐蚀动力学、锈层成分、腐蚀形貌。结果表明,TC4-316L铆接件在周期浸润实验1200 h后,316L不锈钢发生了腐蚀,而TC4钛合金并没有明显的腐蚀现象;316L不锈钢腐蚀产物包含FeOOH,Fe3O4和Fe2O3,而TC4钛合金表面主要为TiO2和Ti2O3等钛的氧化物组成的氧化膜。与单件316L不锈钢相比,由于电偶腐蚀与缝隙腐蚀的共同作用,TC4-316L铆接件中的316L不锈钢腐蚀加速。

Corrosion Behavior of Riveted Joints of TC4 Ti-Alloy and 316L Stainless Steel in Simulated Marine Atmosphere

The corrosion behavior of riveted dissimilar metals TC4-316L in simulated marine atmospheric conditions was investigated by means of mass loss methods,X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and confocal laser scanning microscopy.While the corrosion kinetics,rust composition,and corrosion morphology are mainly concerned.The results indicate 316L stainless steel is corroded when riveted parts TC4-316L were immersed in 3.5%NaCl solution periodically for 1200 h,but TC4 Ti-alloy has no obvious corrosion.The corrosion products of 316L stainless steel composed of FeOOH,Fe3O4 and Fe2O3,while the oxide scale formed on the surface of TC4 Ti-alloy is mainly TiO2 and Ti2O3.Compared with the corrosion behavior of the bare 316L stainless steel,the 316L stainless steel with riveted TC4 Ti-alloy was suffered from accelerated corrosion due to the combined effect of galvanic corrosion and crevice corrosion.