Application of the modified electrochemical potentiodynamic reactivation method to evaluate intergranular corrosion susceptibility of stainless steels
- Univ. of Science and Technology, Beijing (China). Dept. of Surface Science and Corrosion Engineering
A new activator was proposed to evaluate the susceptibility of type 304L (UNS S30403) stainless steel (SS) to intergranular corrosion (IGC) using the electrochemical potentiodynamic reactivation (EPR) technique. Thioacetamide (CH{sub 3}CSNH{sub 2}) was proven to be more suitable as an activator than other compounds containing sulfur. Use of the modified EPR test with the new activator was investigated on types 304L SS and 308L SS (UNS S30800) and on weld buildup type 308L SS. Results showed the modified EPR test differentiated the degree of sensitization (DOS) of steel mildly, slightly, or entirely free of sensitization. DOS of type 304L SS sensitized at 650 C for various time periods as determined by the modified EPR test with CH{sub 3}CSNH{sub 2} was compared to the traditional EPR test with potassium thiocyanate (KSCN) as the activator and to the copper-accelerated Strauss test. The modified EPR test was more sensitive to detect sensitization than the traditional EPR test and was more capable of detecting and quantifying mild sensitization than the traditional EPR test and the Strauss test. DOS of type 308L SS of various sensitizations as measured by the modified EPR test correlated well with the Huey test.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 669820
- Journal Information:
- Corrosion, Vol. 54, Issue 5; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Low-temperature stress corrosion cracking of alloy 601 in thiosulfate and chloride solutions
Effect of prior cold work on intergranular and transgranular corrosion in type 304 stainless steels: Quantitative discrimination by image analysis