An XPS study of passive films on Nickel and alloy 600 in acids |
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| Authors: | A Kawashima K Asami K Hashimoto |
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| Affiliation: | 1. Ural Federal University, Institute of Natural Sciences, Russia;2. Institute of Solid State Chemistry, Urals Department of Russian Academy of Sciences, Russia;1. Department of Chemistry, Mount Holyoke College, South Hadley, MA 01075,United States;2. Medical School, Duke-NUS, 169857, Singapore |
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| Abstract: | Compositions of surface films formed on nickel and Alloy 600 in I M HCI, 0.5 M H2SO4 and I/3 M H3PO1 solutions were investigated as a function of polarization potential. The main constituent of surface films formed on Ni in 0.5 M H2SO4 or 1/3 M H3PO4 solution was hydrated nickel oxyhydroxide, in which the ratio of O2 to OH− increased when passivation occurred. The surface films formed on Ni and Alloy 600 at lower potentials in 0.5 M H2SO4 solution contain S2 ions other than SOP42− ions, whereas S2− ions were not incorporated in the passive film. Passivation of Alloy 600 took place by the formation of hydrated chromium oxyhydroxide. Pitting led to no substantial change in the average composition of the film. |
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