Effects of chromate and molybdate on stress corrosion cracking of type 304 austenitic stainless steel in hydrochloric acid solution

Journal Article · Sat Apr 01 04:00:00 EST 2000 · Corrosion (Houston)

DOI:https://doi.org/10.5006/1.3280539· OSTI ID:20050516

Nishimura, R; Sundjono,

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

Related Subjects

36 MATERIALS SCIENCE
CHROMATES
CORROSION INHIBITORS
FRACTURE PROPERTIES
HYDROCHLORIC ACID
MOLYBDATES
PREDICTION EQUATIONS
STAINLESS STEEL-304
STRESS CORROSION
STRESSES