Effects of chromate and molybdate on stress corrosion cracking of type 304 austenitic stainless steel in hydrochloric acid solution
Stress corrosion cracking (SCC) of a commercial austenitic stainless steel type 304 (UNS S30400) was investigated as a function of inhibitor concentration (chromate and molybdate), applied stress, and test temperature in 0.82 kmol/m{sup 3} hydrochloric acid (HCl) solution by using a constant load method. Applied stress vs. time-to-failure curves were divided into three regions that were dominated by either stress, SCC, or corrosion, except for the base with high chromate concentrations of >0.9 kmol/m{sup 3}. In the SCC-dominated region, the logarithm of the steady-state elongation rate, which was obtained from the corrosion elongation curve (elongation vs. time), was a linear function of the logarithm of time-to-failure, irrespective of chromate and molybdate concentrations, applied stress, and test temperature. This result showed that the steady-state elongation rate became a useful parameter for prediction of time-to-failure. In addition, the roles of chromate and molybdate in SCC were discussed in terms of the ability of passivation and ion-selective property.
- Research Organization:
- Osaka Prefecture Univ., Sakai (JP)
- OSTI ID:
- 20050516
- Journal Information:
- Corrosion (Houston), Journal Name: Corrosion (Houston) Journal Issue: 4 Vol. 56; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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