纯Ti在600℃NaCl盐雾环境中的腐蚀行为

Corrosion Behavior of Pure Ti in NaCl Salt Spray Environment at 600℃

在600℃NaCl盐雾环境中对纯Ti和Ti60合金进行腐蚀试验,通过扫描电镜,X射线衍射仪和电子探针等分析技术,从氧化动力学、氧化膜相组成和微观结构方面,研究了纯Ti在试验环境中的腐蚀行为。结果表明:在600℃NaCl盐雾环境中腐蚀100 h后,纯Ti的腐蚀速率远高于Ti60合金。NaCl的加入使纯Ti表面氧化膜形成孔隙和裂纹,增加TiCl_(4)的挥发和Ti的向外扩散,形成新的反应表面,开始新的生长周期,从而形成重复的多层氧化膜。

Corrosion tests were carried out on pure Ti and Ti60 alloy in a NaCl salt spray environment at 600℃,and the oxidation kinetics,oxide film phase composition and microstructure were analyzed by scanning electron microscopy(SEM),X-ray diffractometer(XRD)and electron probe microanalysis(EPMA),to study the corrosion behavior of pure Ti in the experimental environment.The results suggested that the corrosion rate of pure Ti in NaCl salt spray environment was much higher than that of Ti60 alloy after being corroded in NaCl salt spray environment at 600℃for 100 h.The presence of NaCl introduced pores and cracks into the oxide scale,increased the volatilization of TiCl_(4),formed a new reaction surface and started a new growth cycle,resulting in repeated multilayer oxide scale.