Initial stages of corrosion pits on AISI 1040 steel in sulfide solution analyzed by temporal series micrographs coupled with electrochemical techniques |
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| Affiliation: | 1. Electrical Engineering Department, Faculty of Engineering, Khon Kaen University, Thailand;2. Asia Engineering, Seagate Technology, Nakhon Ratchasima, Thailand;3. Recording Head Group, Seagate Technology, Bloomington, MN USA;4. Seagate Research Group, Seagate Technology, Shakopee, MN, USA;1. Laboratório de Sensores Eletroquímicos (LabSensE), Departamento de Química, Universidade Federal do Paraná (UFPR), CEP 81.531-980 Curitiba, PR, Brazil;2. Grupo de Catálise e Cinética (GCC), Departamento de Química, Universidade Federal do Paraná (UFPR), CEP 81.531-980 Curitiba, PR, Brazil;3. Grupo de Química dos Materiais (GQM), Departamento de Química, Universidade Federal do Paraná (UFPR), CEP 81.531-980 Curitiba, PR, Brazil;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;2. Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu 610213, China;3. Research Institute of Safety, Environmental Protection and Quality Supervision and Inspection, Chuanqing Drilling Engineering Co., Ltd., Guanghan, Sichuan 618300, China |
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| Abstract: | This work presents a study of the initial instants in the pitting corrosion of AISI 1040 steel, analyzed by temporal series micrographs coupled to an open circuit potential (Eoc) and polarization curves. During the Eoc measurement, the pit induction time and the initial pit growth in MnS inclusions was detected in alkaline sulfide solution. The pit area behavior has two distinct rate of area changes in specific regions directly associated to current slope changes. Finally, it was possible to create a three-dimensional model of the pit depth evolution on the metal, using Faraday’s law and the bullet-shaped geometry. |
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| Keywords: | A. Low alloy steel B. Electrochemical calculation B. Polarization C. Inclusion C. Pitting corrosion |
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