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| Corrosion Behavioursof Storage Tank Steel in 3.5%NaCl Solution |
| Received:July 13, 2018 Revised:October 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.10.014 |
| KeyWord:storage tank 3.5%NaCl corrosion behavior hydrostatic test |
| Author | Institution |
| QIN Ming |
1. Key Laboratory of Marine Environment Corrosion and Bio-fouling, Chinese Academy of Sciences, Qingdao , China;2. University of Chinese Academy of Sciences, Beijing , China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China |
| LI Yan-tao |
1. Key Laboratory of Marine Environment Corrosion and Bio-fouling, Chinese Academy of Sciences, Qingdao , China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China;4. Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science andTechnology, Qingdao , China |
| XU Wei-chen |
1. Key Laboratory of Marine Environment Corrosion and Bio-fouling, Chinese Academy of Sciences, Qingdao , China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China;4. Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science andTechnology, Qingdao , China |
| YANG Li-hui |
1. Key Laboratory of Marine Environment Corrosion and Bio-fouling, Chinese Academy of Sciences, Qingdao , China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China;4. Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science andTechnology, Qingdao , China |
| HOU Bao-rong |
1. Key Laboratory of Marine Environment Corrosion and Bio-fouling, Chinese Academy of Sciences, Qingdao , China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China;4. Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science andTechnology, Qingdao , China |
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| Abstract: |
| Objective To compare and study corrosion behaviors of three kinds of storage tanks during hydrostatic testing. Methods 9Ni steel, Q235 carbon steel, 304L stainless steel tank material and 3.5% NaCl simulated seawater solution were se-lected. The open circuit potential test, electrochemical impedance spectroscopy test and potentiodynamic polarization curve test method were used to study the electrochemical corrosion characteristics of three types of storage tanks in simulated seawater. Meanwhile, the microscopic corrosion morphology was analyzed in combinationwith soaking weight loss test. Results The open circuit potentials of the stabilized 9Ni steel, Q235 carbon steel, and 304L stainless steel were ?0.55 mVSCE, ?0.64 mVSCE, and ?0.10 mVSCE, respectively; the Rt values were 2 792 Ω?cm2, 1 765 Ω?cm2, and 125 100 Ω?cm2, respectively; and the average corrosion depths were 0.0706 mm/a, 0.1603 mm/a, 0.0025 mm/a, respectively. The micro-corrosion morphology showed signif-icant corrosion on the surface of 9Ni steel and Q235 carbon steel; while 304L stainless steel showed slight pitting corrosion. Conclusion In 3.5% NaCl simulated seawater solutions, 304L stainless steel is the most resistant to corrosion, Q235 carbon steel is the most susceptible to corrosion, and 9Ni steel is between the two. Temporary protection is required during seawater pressure testing of 9Ni steel and Q235 carbon steel tanks. |
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