Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5396111 | Journal of Electron Spectroscopy and Related Phenomena | 2013 | 5 Pages |
Abstract
By using X-ray photoelectron spectroscopy (XPS), X-ray diffractometer (XRD) and scanning electron microscopy (SEM), we investigate the corrosion behavior and the structure of the oxide film of Ti-6Ta alloy that is subjected to the immersion corrosion test in 8Â mol/L boiling nitric acid for 432Â h. Based on the phase constitution indentified by depth profile XPS, the oxide film could be divided into three sub-layers along its thickness direction: the chemical stable TiO2 and Ta2O5 are present in layer I; the sub-oxide Ti2O3 and TaO are present in the layer II and layer III, and the high valence oxide evolutes from their sub-oxide gradually. Owing to the shielding effect of Ta2O5, the corrosion rate of the Ti-6Ta alloy decreases from 0.051Â mm/y to 0.014Â mm/y with increasing immersion time, showing an excellent corrosion resistance in 8Â mol/L boiling nitric acid.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Dizi Guo, Yingli Yang, Jinping Wu, Bin Zhao, Hengzhang Zhao, Hangbiao Su, Yafeng Lu,