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| Tribo-corrosion Behaviours of Microarc Oxidation Coating on Titanium Alloy Surface in Simulated Marine Environment |
| Received:January 15, 2021 Revised:March 12, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.06.007 |
| KeyWord:TC17 alloy micro-arc oxidation electrochemical impedance corrosion resistance tribo-corrosion |
| Author | Institution |
| ZHANG Yu-lin |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| PANG Ya-jie |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| HAI Chao |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| DU Cui-wei |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China;Key Laboratory for Corrosion and Protection of the Ministry of Education , Beijing , China;Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing , China |
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| Abstract: |
| The studies were aimed to explore the tribo-corrosion behaviours of TC17 alloy and MAO coating in simulated marine environment. The surface and cross-sectional micro-structures, elements distribution and crystal structure were analyzed by SEM, EDS and XRD, respectively. Meanwhile, the corrosion resistance and tribo-corrosion behaviours of the as-prepared specimens were tested by electrochemical workstations and friction-corrosion equipment, respectively. The results indicate that the MAO coating prepared in silicate solution possessed superior bond to the substrate, and no obvious micro-cracks observed on the coating surface without mounts of small and evenly distributed micropores. In addition, The MAO coating is mainly composed of rutile phase, anatase phase and SiO2 phase. The electrochemical testing revealed that the self-corrosion potential of MAO coating is slightly higher than that of substrate, while the passivation current density is significantly reduced. Furthermore, the friction coefficient of the MAO coating is lower and its open circuit potential decreases slowly comparing with TC17 alloy during tribo-corrosion process. Therefore, the oxide film formed on TC17 alloy is difficult to play an effective protective role for which breaks instantly as soon as sliding. However, the MAO coating can supply an excellent wear resistance against the friction ball due to the high hardness of rutile phase and SiO2 phase. |
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