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| Cathodic Protection Behaviors of High Strength Stainless Steel in Seawater |
| Received:April 03, 2023 Revised:June 15, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.08.007 |
| KeyWord:ocean engineering high strength stainless steel cathodic protection cathodic polarization electrochemical behavior XRD |
| Author | Institution |
| WANG Xin |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| BAI Shuang-feng |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| GUO Yun-feng |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| HUANG Zhe-hua |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| LI Xiang-bo |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| HOU Jian |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| ZHANG Hui-xia |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
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| Abstract: |
| The work aims to study the polarization behavior of high strength stainless steel at different cathodic polarization potentials, so as to determine the reasonable cathodic protection potential range of high strength stainless steel. The cathodic reaction process of the high strength stainless steel was studied by electrochemical test methods such as potentiodynamic polarization test and electrochemical impedance test. The corrosion products on the surface of the samples were observed and analyzed by cathodic polarization combined with scanning electron microscope and energy dispersive spectrometer. The effect of cathodic polarization potential on the cathodic product film on the surface of the high strength stainless steel and the cathodic protection effect of the high strength stainless steel in seawater were studied. Potentiodynamic polarization test indicated that when the cathode polarization potential was ‒0.50 V~‒0.9 V, only a small cathode current could make the polarization potential change significantly. Electrochemical impedance spectroscopy test and fitting results show that when the polarization potential was ‒0.7 V, the charge transfer resistance of electrode reaction was the maximum, and the corrosion was completely suppressed. Potentiostatic polarization test found that with the negative shift of potential, the polarization current density decreased firstly and then increased. EDS analysis of the surface products showed that the density of calcium and magnesium deposited layer increased firstly and then decreased. This kind of high strength stainless steel can be effectively protected when the cathode potential is ‒0.50~‒1.00 V under seawater environment. |
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