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| Effects of Hydrogen on Passive Film of Nanocrystallized Stainless Steel Coating |
| 中科院金属研究所 |
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Abstract The effects of hydrogen on corrosion behavior and passive film of nano-crystalline stainless steel coat?鄄ing in 0.5 mol/L NaCl + 0.05 mol/L H2SO4 solution were investigated using electrochemical technique, X-ray photoelectron spectroscopy (XPS) analysis and scanning electron microscopy (SEM) observation. During the for?鄄mation process of passive film, the hydrogen could slow down the formation of the passive film because the exis?鄄tence of hydrogen would reduce the adsorbed OH- ions on the coating surface. XPS analysis results indicated that the OH-/O2- ratio in the passive film was changed after hydrogen charging. The susceptibility to pitting of the charged coating was enhanced because of the increment of OH-/O2- ratio in the passive film.Mott-Schottky analy?鄄sis showed that the hydrogen protons could enhance the dielectric constant of the passive film and account for the increase in capacitance and carrier density of passive films. In addition, the passive current density decreased and the carrier densities increased with the increment of hydrogen charging current.
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Received: 21 July 2006
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