|
| Effect of Anodizing on Couple Galvanic Corrosion of SP700 Titanium Alloy/2A12 Aluminum Alloy |
| Received:September 13, 2020 Revised:September 30, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.08.006 |
| KeyWord:SP700 titanium alloy 2A12 aluminum alloy polarization galvanic corrosion anodic oxide film numerical simulation |
| Author | Institution |
| MENG Li-li |
China Aviation Manufacturing Technology Research Institute, Beijing , China |
| FAN Wei-jie |
Naval Aviation University Qingdao Campus, Shandong Qingdao , China |
| ZHU Yan-hai |
China Aviation Manufacturing Technology Research Institute, Beijing , China |
| LIAO Jin-hua |
China Aviation Manufacturing Technology Research Institute, Beijing , China |
| YANG Wen-fei |
Naval Aviation University Qingdao Campus, Shandong Qingdao , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The corrosion law and mechanism of anodizing on the couple composed of SP700 titanium alloy and 2A12 aluminum alloy was studied.The corrosion resistance of SP700 titanium alloy before and after anodizing was studied by means of electrochemical polarization curve test. Taking this as the boundary condition, the couple corrosion of SP700 titanium alloy and 2A12 aluminum alloy in different states was simulated by finite element numerical simulation;At the same time, the galvanic corrosion test of couple pairs was carried out to verify the simulation results. In addition, through the characterization of the surface micro morphology of the specimens after galvanic corrosion, the differences of corrosion laws of different couples were further analyzed. The self-corrosion potential of SP700 titanium alloy before anodizing was ‒283 mV and the corrosion current density was 6.164×10‒9 A/cm2. The self-corrosion potential after oxidation was ‒270 mV and the corrosion current density was 8.589×10‒10 A/cm2. The self-corrosion potential of SP700 titanium alloy after oxidation had little difference, indicating that the self-corrosion driving force had little change. However, the self-corrosion current density of SP700 titanium alloy after oxidation was one order of magnitude smaller than that of SP700 titanium alloy before oxidation, indicating that the corrosion rate of titanium alloy after oxidation was significantly reduced. Therefore, it could be predicted that the galvanic current density between SP700 titanium alloy and 2A12 aluminum alloy after oxidation would be lower than that between SP700 titanium alloy and 2A12 aluminum alloy before oxidation. The formation of oxide film may reduce the galvanic corrosion rate between the two alloys and would be verified by galvanic corrosion simulation and galvanic corrosion test. |
| Close |
|
|
|