Characterization of passive film on 2205 duplex stainless steel in sodium thiosulphate solution

被引:255
作者
Luo, H. [1 ]
Dong, C. F. [1 ]
Xiao, K. [1 ]
Li, X. G. [1 ]
机构
[1] Univ Sci & Technol Beijing, Ctr Corros & Protect, Beijing 100083, Peoples R China
关键词
2205 duplex stainless steel; Passive film; Sodium thiosulphate; STRESS-CORROSION CRACKING; ELECTROCHEMICAL-BEHAVIOR; ELECTRONIC-PROPERTIES; OXIDE-FILMS; RESISTANCE; MICROSTRUCTURE; MODEL; ION; 304-STAINLESS-STEEL; SPECTROSCOPY;
D O I
10.1016/j.apsusc.2011.06.077
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electrochemical behaviour of passive film formed on 2205 duplex stainless steel in 0.1 M Na2S2O3 solutions was investigated using potentiodynamic polarization, EIS, Mott-Schottky analysis and the compositions of oxide film in different passive regions were carried out by XPS. The results indicated that the impedance is dependent on the applied potential indicating the occurrence of a charge transfer reaction in a porous film. The doping densities evaluated from Mott-Schottky plots demonstrated that there existence of two donor levels in the space charge layer of the passive films. The donor density (N-D1 and N-D2) values are in the range of 10(20)-10(21) cm(3), and decreases exponentially with increasing film formation potential, which is in good agreement with the theoretical consequences of the PDM. The polarization curve and XPS results shows that in the passive regions the 2205 duplex stainless steel exhibits different electrochemical and semiconductor properties. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:631 / 639
页数:9
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