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The effect of Acetobacter sp. and a sulfate-reducing bacterial consortium from ethanol fuel environments on fatigue crack propagation in pipeline and storage tank steels
Affiliation:1. National Institute of Standards and Technology, Applied Chemicals and Materials Division, Boulder, CO 80305, USA;2. Dept. of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, USA;1. State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;2. Institute of Material Forming and Control Engineering, College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China;3. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;1. Department of Microbiology and Plant Biology, University of Oklahoma, Norman, USA;2. Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana-Cuajimalpa, Mexico;3. Institute for Coastal Marine Environment (IAMC) – CNR U.O.S. of Messina, Spianata San Raineri 86, 98121 Messina, Italy;4. Immanuel Kant Baltic Federal University, Kaliningrad, Russia;1. Department of Biology, Microbiology and Biotechnology, Federal University Ndufu-Alike, Ikwo, Ebonyi State, Nigeria;2. Chevron Nigeria Limited, Lagos, Nigeria;3. School of Life Sciences, University of KwaZulu Natal Westville campus, Durban, South Africa;1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;3. Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Shenyang 110016, China;1. National Engineering Research Center for Cereal Fermentation and Food Biomanufacturing, State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China;2. Luzhou Laojiao Group Co. Ltd, Luzhou 646000, China;3. Shaoxing Key Laboratory of Traditional Fermentation Food and Human Health, Jiangnan University (Shaoxing) Industrial Technology Research Institute, Shaoxing, Zhejiang 312000, China;4. National Engineering Research Center of Huangjiu, Zhejiang Guyuelongshan Shaoxing Wine Co., Ltd., Shaoxing, Zhejiang 312000, China;5. China Alcoholic Drinks Association, Beijing 100089, China
Abstract: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 (ΔK). The mechanism for increased fatigue damage is hydrogen uptake through adsorption into the steel, which embrittles material ahead of the growing fatigue crack.
Keywords:C  Corrosion fatigue  C  Hydrogen embrittlement  C  Intergranular corrosion  C  Microbiological corrosion  B  SEM  A  Steel
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