{"678378":{"#nid":"678378","#data":{"type":"event","title":"PhD Proposal by Abdullah Alzubail","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003EAbdullah Alzubail\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003E(Advisor: Prof. Preet Singh)\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003Ewill propose a doctoral thesis entitled,\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ECorrosion and Environmental Assisted Cracking of Carbon and Austenitic Stainless Steel in Thiosulfate-Containing Environments\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003EOn\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003E\u0026nbsp;\u003C\/em\u003E\u003Cstrong\u003ETuesday, November 26 at 9:00 a.m. (EST)\u003C\/strong\u003E\u003Cbr\u003E\u003Cem\u003E\u0026nbsp;\u003C\/em\u003E\u003Cstrong\u003EJ. Erskine Love Room 295\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003Eand\/or\u003C\/strong\u003E\u003Cbr\u003E\u003Cstrong\u003EVirtually via Zoom\u003C\/strong\u003E\u003Cbr\u003E\u003Ca href=\u0022https:\/\/gatech.zoom.us\/j\/93232314638?pwd=tbtsp1CMsozNVwZsa46s58xRF8AZcU.1\u0022\u003E\u003Cstrong\u003Ehttps:\/\/gatech.zoom.us\/j\/93232314638?pwd=tbtsp1CMsozNVwZsa46s58xRF8AZcU.1\u003C\/strong\u003E\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ECommittee\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003EProf. Preet Singh \u2013 School of Materials Science and Engineering (advisor)\u003C\/li\u003E\u003Cli\u003EProf. Hamid Garmestani \u2013 School of Materials Science and Engineering\u003C\/li\u003E\u003Cli\u003EDr. Josh Kacher \u2013 School of Materials Science and Engineering\u003C\/li\u003E\u003Cli\u003EDr. Matthew McDowell \u2013 School of Materials Science and Engineering\u003C\/li\u003E\u003Cli\u003EDr. Christian Canto Maya - Saudi Arabian Oil Company\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EThiosulfate (S2O32-) is used across various industrial applications, including oil and gas, pulp and paper, nuclear, and mining. Given thiosulfate\u0027s versatile nature and wide range of uses, this proposed research explores a broad range of environmental conditions involving thiosulfate and its potential redox transformation products. Understanding thiosulfate\u2019s interactions with materials is essential for enhancing material performance, particularly in improving corrosion resistance. In this study, the surface reactions and films formed on carbon steel X-65 and austenitic stainless steel 316L are systematically characterized to understand their role in corrosion and stress corrosion cracking (SCC). Furthermore, this study introduces a novel approach for electrochemically generating an H\u2082S environment from thiosulfate, independent from steel dissolution.\u003C\/p\u003E\u003Cp\u003EThe environmental testing conditions include oxic and anoxic environments, with varying concentrations of S\u2082O\u2083\u00b2\u207b (10\u207b\u00b2 M, 10\u207b\u00b9 M, and 1 M), sodium chloride (0%, 2.5%, and 5%), and pH levels (2.5, 6, and 10). These environmental parameters directly impact the thermodynamic stability of the combined thiosulfate-steel system, with further implications for the corrosion and SCC of steel alloys.\u003C\/p\u003E\u003Cp\u003ECorrosion films formed on carbon steel and stainless steel in various thiosulfate environments were characterized using electrochemical impedance spectroscopy (EIS) to estimate the film\u0027s impedance, assess its ability to inhibit further corrosion, and determine its structural layers. Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) are considered for validating the film\u0027s structure and composition.\u003C\/p\u003E\u003Cp\u003EChronoamperometry was used to evaluate the repassivation kinetics of steel alloys by monitoring the electric current flow after film disruption. These tests help identify environmental conditions that are likely to promote SCC. To further assess SCC susceptibility, Slow Strain Rate Testing (SSRT) is being considered for both steel alloys. The fracture surfaces from SSRT samples will be examined using SEM and EDS to determine fracture modes and analyze the composition of reaction products.\u003C\/p\u003E\u003Cp\u003EHydrogen sulfide (H\u2082S) is one of the potential redox products of thiosulfate. In various studies, thiosulfate has been used to simulate H\u2082S environments for investigating H\u2082S-induced corrosion and SCC. This approach is preferred in several studies as an alternative to directly handling H\u2082S gas, due to its high toxicity and severe health risks. However, a major limitation noted in the literature is the requirement for initial steel dissolution to generate H\u2082S. In this study, the electrochemical generation of H\u2082S from thiosulfate was demonstrated independently of steel dissolution. This was achieved by applying specific potentials to thiosulfate to target H\u2082S production. Sulfide generation in the solution was measured using a sulfide-selective electrode at different applied potentials.\u003C\/p\u003E\u003Cp\u003EThis research could benefit various industries by enhancing the understanding of thiosulfate\u0027s role in corrosion and its interactions with material surfaces across a range of environmental conditions. Insights from this study could support decision-making for developing new corrosion-resistant alloys or optimizing control processes to prevent or mitigate corrosion and SCC.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003ECorrosion and Environmental Assisted Cracking of Carbon and Austenitic Stainless Steel in Thiosulfate-Containing Environments\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003EOn\u003C\/em\u003E\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Corrosion and Environmental Assisted Cracking of Carbon and Austenitic Stainless Steel in Thiosulfate-Containing Environments On"}],"uid":"27707","created_gmt":"2024-11-12 20:12:13","changed_gmt":"2024-11-12 20:12:55","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2024-11-26T09:00:00-05:00","event_time_end":"2024-11-26T11:00:00-05:00","event_time_end_last":"2024-11-26T11:00:00-05:00","gmt_time_start":"2024-11-26 14:00:00","gmt_time_end":"2024-11-26 16:00:00","gmt_time_end_last":"2024-11-26 16:00:00","rrule":null,"timezone":"America\/New_York"},"location":"J. Erskine Love Room 295 and\/or Virtually via Zoom","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}