期刊
CORROSION SCIENCE
卷 150, 期 -, 页码 218-234出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.02.002
关键词
Stainless steel; EIS; XPS; Passive films
资金
- National Natural Science Foundation of China [51701102and51601182]
- Fundamental Research Funds for the Central Universities [201762008]
- National Environmental Corrosion Platform
Passivation and film chemistry of 2507 super duplex stainless steel in modified artificial seawater (ASW) are investigated. Removal of dissolved oxygen decreases the electric field strength and point defect diffusivity of the passive film. Passive current density in acidified ASW is higher than that in aerated ASW due to increased potential drop across film/solution interface, donor density and point defect diffusivity. The content of oxidized Cr, Fe(II) and hydroxides increases and film thickness reduces with acidification. In acidified ASW, passive film become denser from pre-passivation to passivation region and pores form accompanied with the increase of oxidized Fe after transpassivation.
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