Electrochemical potential noise of 321 stainless steel stressed under constant strain rate testing conditions

Shi, Zhiming, Song, Guangling, Cao, Chu-nan, Lin, Haichao and Lu, Ming (2007) Electrochemical potential noise of 321 stainless steel stressed under constant strain rate testing conditions. Electrochimica Acta, 52 5: 2123-2133. doi:10.1016/j.electacta.2006.08.029


Author Shi, Zhiming
Song, Guangling
Cao, Chu-nan
Lin, Haichao
Lu, Ming
Title Electrochemical potential noise of 321 stainless steel stressed under constant strain rate testing conditions
Journal name Electrochimica Acta   Check publisher's open access policy
ISSN 0013-4686
Publication date 2007-01-01
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.electacta.2006.08.029
Open Access Status
Volume 52
Issue 5
Start page 2123
End page 2133
Total pages 11
Editor E. J. Cairns
S. Trasatti
Place of publication Oxford
Publisher Pergamon-elsevier Science Ltd
Language eng
Subject 291400 Materials Engineering
671000 Fabricated Metal Products
C1
Abstract An investigation was carried out on the features of potential electrochemical potential noise of stressed AISI321 stainless steel in solution 0.5 mol/L Na2SO4 + 5 x 10(-3) mol/L H2SO4 under constant-strain-rate-testing (CSRT) conditions. The results showed that the strained steel exhibited a white noise feature at low frequencies and the amplitude of potential fluctuation depended on elongation of the steel. Power spectral density (PSD) of the noise increased with increasing strain level. The noise level in the elastic region of the steel was relatively low, which increased with elongation. After the steel yielded, the electrochemical noise level became higher but it increased less significantly with increasing strain. In the fracture region, the potential noise reached the maximum level. In addition to the dependence of electrochemical noise on strain level, it was also found that the electrochemical noise level increased with increasing strain rate. To interpret the generation mechanism of electrochemical noise, a simple model was proposed based on an assumption that strain results in breakdown and repairing of the passive film on the steel. With this model, the dependence of electrochemical potential noise and its power spectral density on strain level and strain rate can be successfully explained. (c) 2006 Elsevier Ltd. All rights reserved.
Keyword Electrochemistry
electrochemical noise (ECN)
passivity
stainless steel
strain
corrosion
Corrosion Cracking
Stainless-steels
Fluctuations
Environments
Initiation
304-stainless-steel
Generation
Chloride
Alloy
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Tue, 19 Feb 2008, 02:05:03 EST