Corrosion protection assessment of sacrificial coating systems as a function of exposure time in a marine environment |
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| Affiliation: | 1. Department of Engineering Science and Mechanics, Penn State University, University Park, PA, United States;2. Concurrent Technologies Corporation, Largo, FL, United States;1. Coating Research Center, Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-1998, Tehran, Iran;2. Polymer Engineering and Color Technology Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran;1. School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, PR China;2. School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China;1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, PR China;2. Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao 266237, PR China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, PR China;4. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, PR China;5. Nanotechnology Research Center, Research Institute of Petroleum Industry (RIPI), West Entrance Blvd., Olympic Village, P.O. Box 14857-33111, Tehran, Iran;6. Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran;1. College of Ocean, Yantai University, Yantai, 264005, China;2. College of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China;3. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology Chinese, Academy of Science, Qingdao, 266071, China;4. Marine Chemical Research Institute, State Key Laboratory of Marine Coatings, Qingdao, 266072, China;5. Ocean University of China, Qingdao, 266001, China;1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China;2. Department of Mechanical Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada |
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| Abstract: | The present investigation assessed the corrosion protection performance of 17 different Zn and Al sacrificial coating system configurations during marine atmospheric exposure at Kure Beach, NC. The coating systems incorporated several conversion coating layers, primers and organic topcoats. Visual observations and electrochemical measurements (including electrochemical impedance spectroscopy, EIS) were made on six different occasions throughout the 20-month exposure time. Milled scribes on each of the coating specimens allowed for defect protection as well as barrier protection to be investigated. A novel corrosion analysis technique utilizing a specialized conducting agar (SCAR) cell enabled impedance measurements to be made on both intact and defect areas. Visual observations, Eoc's, and EIS as a function of atmospheric exposure time provided complementary results. Impedance results were found to be useful in determining a coating's barrier protection and scribe damage analysis accurately represented defect protection. |
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