Strain-induced reactivation of corrosion pits in austenitic stainless steel

被引：48
|
作者：
Almuaili, F. A. [3 ]
McDonald, S. A. [2 ]
Withers, P. J. [2 ]
Cook, A. B. [1 ]
Engelberg, D. L. [1 ]
机构：
[1] Univ Manchester, Sch Mat, Corros & Protect Ctr, Sackville St, Manchester M13 9PL, Lancs, England
[2] Univ Manchester, Sch Mat, Manchester Xray Imaging Facil, Sackville St, Manchester M13 9PL, Lancs, England
[3] Saline Water Convers Corp, Desalinat Technol Res Inst, POB 8328, Al Jubail 31951, Saudi Arabia
来源：
CORROSION SCIENCE | 2017年 / 125卷
基金：
英国工程与自然科学研究理事会;
关键词：
Stainless steel; Electrochemical polarisation; Time-lapse X-ray computed tomography; Pitting corrosion; Reactivation; PITTING CORROSION; SALT FILMS; INITIATION; CRACKING; EVOLUTION; DISSOLUTION; TOMOGRAPHY; CHEMISTRY; MECHANISM; PASSIVITY;
D O I：
10.1016/j.corsci.2017.05.023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The reactivation of a corrosion pit under the synergetic effect of strain and electro-chemical polarisation has been observed in a type 304L stainless steel using X-ray computed tomography. The pit reactivation process was associated with the formation of a new pit, directly adjacent to a pre-existing pit. Pit growth kinetics were estimated, revealing an increase of the diffusivity parameter (D-eff Delta C) from 3.0 x 10(-8) mol cm(-1) s(-1) to 4.5 x 10(-8) mol cm(-1) s(-1) with the application of strain, indicating higher metal dissolution rates. Applied strain resulted in fractured lacy metal covers, and its effect on pit growth kinetics is discussed.
引用
收藏
页码：12 / 19
页数：8
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