Stress Corrosion Cracking Detection of Sensitized Stainless Steel 304 in Chloride Media by Using Electrochemical Impedance Spectroscopy (EIS)

Journal of Petroleum Science and Technology

J. Neshati¹  B. Adib²  A. Sardashti² 

[1] Corrosion Department, Research Institute of Petroleum Industry (RIPI);Department of Chemistry, Islamic Azad University, North Tehran Branch;

关键词: stress corrosion cracking;    stainless steel 304;    u-bend;    monitoring;    eis;   

DOI  :  10.22078/jpst.2012.94

来源: DOAJ

【 摘 要 】

Electrochemical impedance spectroscopy (EIS) was used to detect stress corrosion cracking (SCC) in stainless steel 304 alloy exposed to an aqueous environment at 120 °C. Stainless steel 304 alloy as u-bend was tested in the solution that contains 40 weight percent of magnesium chloride. U-bended samples were prepared according to ASTM G30. EIS measurements were always performed simultaneously on u-bend samples under stress and non-stress conditions. The results indicate that changes in phase shift versus time could be related to the stress corrosion cracking process. Stress corrosion cracking is detectable at a frequency of 23.95 Hz. EIS measurement can be used for SCC monitoring in u-bend samples. Finally, analysis of the fracture surface by using metallographic and SEM techniques confirmed the EIS results.

【 授权许可】

Unknown