A point defect model for the general and pitting corrosion on iron|oxide|electrolyte interface deduced from current oscillations

被引:37
作者
Pagitsas, M [1 ]
Diamantopoulou, A [1 ]
Sazou, D [1 ]
机构
[1] Aristotle Univ Thessaloniki, Dept Chem, Phys Chem Lab, GR-54006 Thessaloniki, Greece
关键词
D O I
10.1016/S0960-0779(02)00351-X
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Analysis of the passive-active oscillatory region of the Fe\0.75 M H2SO4 system, perturbed by adding small amounts of halide species, allow the distinction between pitting and general corrosion. Complex periodic and aperiodic current oscillations characterize pitting corrosion whereas monoperiodic oscillations of a relaxation type indicate general corrosion. A point defect model (PDM) is considered for the microscopic description of the growth and breakdown of the iron oxide film. The physicochemical processes leading to different types of corrosion can be clarified in terms of the PDM. Occupation of an anion vacancy by a halide ion results in the localized attack of the passive oxide and pitting corrosion. On the other hand, the formation of surface soluble iron complexes is related to the uniform dissolution of the passive oxide and general corrosion. (C) 2002 Elsevier Science Ltd. All rights reserved.
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收藏
页码:263 / 275
页数:13
相关论文
共 26 条
[1]   OCCURRENCE OF SALT FILMS DURING REPASSIVATION OF NEWLY GENERATED METAL-SURFACES [J].
ALKIRE, R ;
ERNSBERGER, D ;
BECK, TR .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1978, 125 (09) :1382-1388
[2]   FORMATION OF SALT FILMS DURING ANODIC METAL DISSOLUTION IN THE PRESENCE OF FLUID-FLOW [J].
ALKIRE, R ;
CANGELLARI, A .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1983, 130 (06) :1252-1259
[3]   Conduction mechanism of the anodic film on Fe-Cr alloys in sulfate solutions [J].
Bojinov, M ;
Fahricius, G ;
Laitinen, T ;
Mäkelä, K ;
Saario, T ;
Sundholm, G .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1999, 146 (09) :3238-3247
[4]   A POINT-DEFECT MODEL FOR ANODIC PASSIVE FILMS .1. FILM GROWTH-KINETICS [J].
CHAO, CY ;
LIN, LF ;
MACDONALD, DD .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1981, 128 (06) :1187-1194
[5]   The structure of the passive film that forms on iron in aqueous environments [J].
Davenport, AJ ;
Oblonsky, LJ ;
Ryan, MP ;
Toney, MF .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (06) :2162-2173
[6]  
FRANCK UF, 1961, Z ELEKTROCHEM, V65, P156
[7]  
Freiman L.I., 1965, CORROS SCI, V5, P199
[8]   Electrochemical passivation of iron in NO3-, SO42-, and ClO4- solutions [J].
Jovanovic, VM ;
Hackerman, N .
JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (49) :9855-9860
[9]   STUDY OF DISSOLUTION OF SIO2 IN ACIDIC FLUORIDE SOLUTIONS [J].
JUDGE, JS .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1971, 118 (11) :1772-&
[10]   A MATHEMATICAL-MODEL FOR CURRENT OSCILLATIONS AT THE ACTIVE PASSIVE TRANSITION IN METAL ELECTRODISSOLUTION [J].
KOPER, MTM ;
SLUYTERS, JH .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1993, 347 (1-2) :31-48