Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 57, Issue -, Pages 56-60Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2015.05.009
Keywords
Passive film; Duplex stainless steel; Cyclic volammetry; XPS; Selective dissolution
Categories
Funding
- National Natural Science Foundation of China [51271023]
- National Basic Research Program of China (973 Program) [2014CB643300]
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The electrochemical behavior and compositions of passive films formed on the constituent phases (alpha-phase, gamma-phase) of 2205 duplex stainless steel (DSS) without coupling in neutral 3.5% NaCl solution were investigated, utilizing single-phase samples prepared by selective dissolution. The results demonstrate that, compared to alpha-phase, Fe species in passive film of alpha-phase are more stable due to the higher content of Mo within alpha-phase. The superior stability of Cr (III) species in the passive layer of gamma-phase may result from the higher content of Ni in gamma-phase, which leads to the higher content of Cr, Cr/Fe ratio, and better passivity of passive layer. The beneficial effect of coupling of two phases on the passive behavior of 2205 DSS is also found. (C) 2015 Elsevier B.V. All rights reserved.
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