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| Application of Oxidation Tape and Covering System (OTC) in Tropical Marine Atmospheric Environment |
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| DOI：10.7643/issn.1672-9242.2023.03.008 |
| KeyWord:oxidation tape and covering system bolt marine atmosphere corrosion protection atmospheric exposure experiment |
| Author | Institution |
| YANG Li-hui |
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Shandong Qingdao , China;Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology Qingdao, Shandong Qingdao , China |
| XU Wei-chen |
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Shandong Qingdao , China;Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology Qingdao, Shandong Qingdao , China |
| WANG Xiu-tong |
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Shandong Qingdao , China;Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology Qingdao, Shandong Qingdao , China |
| WANG Ying |
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Shandong Qingdao , China;Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology Qingdao, Shandong Qingdao , China |
| HOU Bao-rong |
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Shandong Qingdao , China;Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology Qingdao, Shandong Qingdao , China |
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| Abstract: |
| The work aims to study the anti-corrosion effects of Oxidation Tape and Covering system (OTC) on high-strength bolts in tropical marine atmospheric environment. The OTC coated and unprotected high-strength bolts were exposed in Sanya atmospheric corrosion test site for 6 a. The corrosion morphology and composition were analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and laser scanning confocal microscopy (LSCM). The corrosion behaviors of OTC coated and unprotected high-strength bolts were investigated through weight loss experiment. A large number of brownish red corrosion products were formed on the unprotected bolt surface. XRD analysis showed that the main components of corrosion products were α-FeOOH, β-FeOOH, γ-FeOOH, Fe3O4, Fe2O3, etc., while β-FeOOH crystal structure contained Cl–, which would accelerate matrix corrosion. According to LSCM analysis, the bolt gasket was in an overall corrosion state, but local corrosion occurred at the same time, and the depth of pitting was more than 120 μm. For high-strength bolts protected by OTC, only a small amount of brown substance appeared at the bottom. Most of them were still kept with the original black matrix surface. The corrosion rate of OTC coated bolts accounted for about 1/15 of the corrosion rate of unprotected bolts. There was no apparent corrosion on the surface of the OTC coated gasket. The oxidation tape and covering system significantly reduces the corrosion rate of high-strength bolts and has excellent corrosion resistance. It plays a good long-term protective role for high-strength bolts in tropical marine atmospheric environment. |
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