Assessment of stress corrosion crack initiation and propagation in AISI type 316 stainless steel by electrochemical noise technique

• Published in: Corrosion science Vol. 48; no. 9; pp. 2689 - 2710
• Main Authors: Anita, T., Pujar, M.G., Shaikh, H., Dayal, R.K., Khatak, H.S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.09.2006; Elsevier Science
• Subjects: Applied sciences; Corrosion; Corrosion environments; Exact sciences and technology; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Pitting corrosion; Power spectral density; Standard deviation; Stress corrosion cracking; Visual records of current and potential; Power spectral density; Pitting corrosion; Visual records of current and potential; Standard deviation; Stress corrosion cracking; Austenitic stainless steel; Electrochemical noise; Mechanical properties; Potential; Corrosion initiation; Density; Crack propagation; Stainless steel-316; Stainless steel; Crack initiation
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2005.09.007

Electrochemical noise (EN) analyses, using time domain, frequency domain and statistical parameters, were carried out on the potential and current data obtained on AISI type 316 stainless steel during (i) pitting corrosion in deaerated 0.5 M sodium chloride (NaCl) solution, and during (ii) stress corrosion cracking (SCC) in boiling acidified NaCl solution. Visual records and statistical analysis of the current and potential data alongwith the spectral estimation using maximum entropy method (MEM) gave useful informations on differentiating between these corrosion processes and on the effect of stress in accelerating pitting corrosion. The results correlated well with the optical microscopic observations.