期刊
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
卷 29, 期 6, 页码 1012-1025出版社
SPRINGER
DOI: 10.1007/s42243-021-00693-0
关键词
Passive film; S31254 super-austenitic stainless steel; Boron; Dissolution; Repairing
资金
- National Natural Science Foundation of China [U1860204, 51871159, 52104338]
- Natural Science Foundation of Shanxi Province [201901D111103]
The impact of boron on the dissolution and repairing behavior of passive films formed on S31254 super-austenitic stainless steel was investigated. The study found that the addition of boron can increase the corrosion resistance and promote the efficiency of passive film repair.
The impact of boron on the dissolution and repairing behavior of passive films formed on S31254 super-austenitic stainless steel (SASS) was investigated. SASS was immersed in 0.5 mol/L of H2SO4 for 0, 2, 6, 10, and 14 days to explore the evolution of the passive film. The electrochemical impedance spectroscope (EIS), the Mott-Schottky analysis, and X-ray photoelectron spectroscope were utilized to analyze the semiconductor properties and compositions of the passive films. EIS showed a decrease and consequent increase over 14 days; the same pattern was observed for Cr2O3 and Cr/Fe. However, the defect density of the passive film exhibited a reverse trend. The variation in film thicknesses indicated that the passive films possessed dissolution and repairing behavior. SASS passive film had a double-layer structure; the outer layer was found to be rich in Fe3+ and Cr(OH)(3), but low on Mo6+, while the inner layer was rich in Cr2O3 and low in Mo4+. The addition of boron increased the corrosion resistance and could promote the efficiency of the passive film repair, likely by promoting the migration of Mox+, which promoted the repairing of the passive film.
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