Repassivation of the damage generated by cavitation on UNS N08031 in a LiBr solution by means of electrochemical techniques and Confocal Laser Scanning Microscopy

被引：54
|
作者：
Fernandez-Domene, R. M. [1 ]
Blasco-Tamarit, E. [1 ]
Garcia-Garcia, D. M. [1 ]
Garcia-Anton, J. [1 ]
机构：
[1] Univ Politecn Valencia, Dept Ingn Quim & Nucl, ETSI Ind, E-46071 Valencia, Spain
来源：
CORROSION SCIENCE | 2010年 / 52卷 / 10期
关键词：
Stainless steel; Polarization; Potentiostatic; Repassivation; Pitting corrosion; STRESS-CORROSION CRACKING; AUSTENITIC-STAINLESS-STEELS; SODIUM-CHLORIDE SOLUTION; NICKEL-ALUMINUM BRONZE; LOW-ALLOY STEEL; PITTING CORROSION; EROSION-CORROSION; FERRITIC-STAINLESS; BEHAVIOR; KINETICS;
D O I：
10.1016/j.corsci.2010.06.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The objective of this work is to study the influence of cavitation on the corrosion behaviour of Alloy 31, a highly-alloyed austenitic stainless steel (UNS N08031), in a LiBr heavy brine solution (992 g/L) at 25 degrees C. The presence of cavitation shifted the OCP value towards the active direction by 708 mV(Ag/AgCl), increased anodic current densities and passivation current density, i(p), and reduced the pitting potential, E-p. Repassivation behaviour of Alloy 31 has been investigated by using potentiostatic tests at different potentials. The current density transient obtained after interrupting cavitation was used to obtain the repassivation index, n, provided by the slope of the log i(t) vs. log t representation. The value of n decreased as the applied potential was increased, reaching values near zero for potentials close to the pitting potential. The damage generated during the potentiostatic tests has been quantified by means of Confocal Laser Scanning Microscopy. (C) 2010 Elsevier Ltd. All rights reserved.
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收藏
页码：3453 / 3464
页数：12
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