紫外光电子能谱和X射线光电子能谱表征在金属材料腐蚀中的应用

Progress in Characterization of Metallic Materials Corrosion by Ultraviolet Photoelectron Spectroscopy and X-ray Photoelectron Spectroscopy

利用紫外光电子能谱(UPS)对比表征了纳米和普通晶粒的304不锈钢、工业纯铝以及工业纯铁室温时的价电子结构。利用X射线光电子能谱(XPS)表征了上述材料在不同浓度盐酸溶液中浸泡不同时间后,表面氧化膜的电子结构;以及纳米和普通晶粒的304不锈钢在空气中高温氧化(室温至900℃升温阶段,900℃下恒温24 h)后,氧化膜的电子结构。根据这些实验结果建立了金属材料腐蚀性能与材料的价电子结构和氧化膜电子结构之间的关系,提出了金属材料腐蚀性能本征参量概念。

In fact, the metallic material corrosion process may intrinsically involve subprocesses such as the exchange of valence electron between metallic atoms and ions in corrosive medium, the formation of oxide scale, the migration of corrosive species through the formed oxide scale, and the interaction between oxidation scale and corrosive medium. Therefore, the energy state of the va- lence electron of components of metallic material may play an important role in the corrosion pro- cess, thus for reveal which, ultraviolet photoelectron spectroscope （UPS） and X-ray photoelectron spectroscope （XPS） may become useful tool. Herewith new progress in this respect is subsequently introduced. The valence electron energy state of components for bulk nanocrystalline materials 304 stainless steel （BN-SS304）, industrial pure aluminum （BN-A1）and ingot iron （BNII）, as well as their counterparts of conventional microcrystalline ones （CP-SS304）, （CP-AI） and （CPII） was char- acterized by UPS at room temperature. The valence electron energy state of components of the ox- ide scale formed on these metallic materials due to corrosion in hydrochloric acid solutions, and the oxide scales formed on BN-SS304 and CP-SS304 due to air oxidation at 900℃ were comparative- ly studied by XPS. The above aquired results may enable one to establish the relationship betweenthe corrosion performance with the valence electron energy state of components of these metallic materials, and to figure the electron structure of components of the corresponding formed oxide scales, as well. Furthermore, a new concept of intrinsic parameter related with metallic material cor- rosion was proposed.