Journal
CORROSION SCIENCE
Volume 79, Issue -, Pages 128-138Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.10.036
Keywords
Corrosion fatigue; Hydrogen embrittlement; Intergranular corrosion; Microbiological corrosion; SEM; Steel
Funding
- U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration through the office of Jim Merritt
- U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration through the office of Robert Smith
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This paper evaluates the effects of microbiologically influenced corrosion (MIC) on fatigue-crack growth of candidate materials useful in expanding bio-ethanol usage, including a storage-tank steel (ASTM A36) and two pipeline steels (API 5L X52 and X70). The microbiological species sampled and cultivated from an ethanol fuel production stream are responsible for both acetic acid and hydrogen sulfide production that lead to significant increases in fatigue-crack growth rate across a wide range of stress-intensity-factor amplitudes (Delta K). The mechanism for increased fatigue damage is hydrogen uptake through adsorption into the steel, which embrittles material ahead of the growing fatigue crack. Published by Elsevier Ltd.
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