期刊
CORROSION SCIENCE
卷 165, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108405
关键词
Stainless steel; XPS; SIMS; acid corrosion; passive films
资金
- National Natural Science Foundation of China [51601182, 51701102, 51901216]
- Fundamental Research Funds for the Central Universities [201762008]
- China Postdoctoral Science Foundation [2019M652471]
Electrochemical analysis, XPS, and ToF-SIMS are combined to characterize the passive properties of 254SMO stainless steel in the simulated condensates after flue gas desulfurization at different temperatures. Increase in condensate temperature causes the enhanced transpassive dissolution and surface deterioration as well as the involvement of oxygen reduction. Solution deaeration counteracts with the reaction rate acceleration, yielding an invariable donor density from 40 to 60 degrees C. Dissolution and precipitation of Fe and oxidation of Mo are facilitated, resulting in the mixed Cr(III)-Fe(III)-Mo(VI/IV) oxide/hydroxide surface layer and the strengthened enrichment of oxidized Cr and oxidized Mo at high temperatures.
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