The effect of inclusion composition and morphology on microbiologically influenced corrosion in low alloy steels
- California Polytechnic State Univ., San Luis Obispo, CA (United States). Materials Engineering Dept.
Microstructure is a key, yet often overlooked variable in micro-biologically influenced corrosion (MIC). A designed experiment was carried out to examine the effects of minor element content (Si, S, and Ce) on the susceptibility of low alloy steels to MIC in anaerobic aqueous systems. A two level, three factor full factorial experiment, using AISI 8630 as the master composition, was used to relate inclusion size, shape, chemical stability and spatial distribution to MIC susceptibility. Significant correlation between MIC susceptibility, measured as pit nucleation frequency and maximum pit size, and inclusion characteristics were found in these materials. Furthermore, significant differences in corrosion susceptibility for equivalent samples exposed to sterile and to biologically active solutions were found. For each heat studied, corrosion was significantly less severe in the sterile solution than in the biologically active solution. The results demonstrate a strong link between material microstructure and MIC and they suggest possible mitigation strategies based on microstructural design.
- OSTI ID:
- 109916
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
Similar Records
The effect of weld thermal cycling of microbial interaction in low alloy steels
The effects of microstructural changes caused by welding on microbiologically influenced corrosion: Material and process implications