{"62262":{"#nid":"62262","#data":{"type":"event","title":"MSE Ph.D. Defense - Xiaoyuan Lou","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003EThesis Title:\u003C\/strong\u003E Stress corrosion cracking and corrosion of\ncarbon steel in simulated fuel-grade ethanol\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\n\n\n\n\u003Cp\u003EToday, ethanol, as well as other biofuels, has been\nincreasingly gaining popularity as a major alternative liquid fuel to replace\nconventional gasoline for road transportation. One of the key challenges for\nthe future use of bioethanol is to increase its availability in the market via\nan efficient and economic way. However, one major concern in using the existing\ngas-pipelines to transport fuel-grade ethanol or blended fuel is the potential\ncorrosion and stress corrosion cracking (SCC) susceptibility of carbon steel\npipelines in these environments. In this talk, both phenomenological and\nmechanistic investigations have been carried out in order to address the\npossible degradation phenomena of X-65 pipeline carbon steel in simulated\nfuel-grade ethanol (SFGE). Firstly, the susceptibilities of stress corrosion\ncracking of this steel in SFGE were studied. Ethanol chemistry of SFGE was\nshown to have great impact on the stress corrosion crack initiation\/propagation\nand the corrosion mode transition. Inclusions in the steel can increase local\nplastic strain and act as crack initiation sites. Secondly, the anodic behavior\nof carbon steel electrode was investigated in detail under different ethanol\nchemistry conditions. General corrosion and pitting susceptibility under\nunstressed condition were found to be sensitive to the ethanol chemistry.\u003C\/p\u003E\n\n\u003Cp\u003ELow tendency to passivate and the sensitivity to ethanol\nchemistry are the major reasons which drive corrosion process in this system.\nOxygen plays a critical role in controlling the passivity of carbon steel in ethanol.\u003C\/p\u003E\n\n\u003Cp\u003EThirdly, the detailed study was carried out to understand\nthe SCC mechanism of carbon steel in SFGE. A film related anodic dissolution\nprocess was identified to be a major driving force during the crack\npropagation. Fourthly, more detailed electrochemical impedance spectroscopy\n(EIS) studies using phase angle analysis and transmission line simulation\nreveal a clearer physical picture of the stress corrosion cracking process in\nthis environment. Fifthly, the cathodic reactions of carbon steel in SFGE were\nalso investigated to understand the oxygen and hydrogen reactions. Hydrogen\nuptake into the pipeline steel and the conditions of the fractures related to\nhydrogen embrittlement were identified and studied.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EMSE Ph.D. Defense - Xiaoyuan Lou -IPST Boardroom, Room 521\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"MSE Ph.D. Defense - Xiaoyuan Lou"}],"uid":"27388","created_gmt":"2010-10-19 13:31:25","changed_gmt":"2016-10-08 01:53:16","author":"Bill Miller","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2010-10-29T02:30:00-04:00","event_time_end":"2010-10-29T04:35:00-04:00","event_time_end_last":"2010-10-29T04:35:00-04:00","gmt_time_start":"2010-10-29 06:30:00","gmt_time_end":"2010-10-29 08:35:00","gmt_time_end_last":"2010-10-29 08:35:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1238","name":"School of Materials Science and Engineering"}],"categories":[],"keywords":[{"id":"10802","name":"MSE_Interal_Event"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}