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| Determination of Maximum Pit Depth of Aluminium Alloy with Foil Penetration Technique |
| Received:October 21, 2018 Revised:March 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.03.004 |
| KeyWord:aluminium alloy foil penetration technique corrosion pit environmental testing |
| Author | Institution |
| LUO Chen |
Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
| SUN Zhi-hua |
Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
| TANG Zhi-hui |
Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
| LU Feng |
Key Laboratory on Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, AECC, Beijing , China |
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| Abstract: |
| Objective To research the relationship between maximum corrosion pit depth in aluminium alloy and environmental testing time to provide technology foundation for corrosion resistance evaluation for new alloys prior to service and life prediction of structures during service. Methods The types of corrosion of a new aluminium alloy in marine atmosphere were analyzed with optical microscopy and SEM. The relationship between maximum corrosion pit depth in aluminium alloy foil and testing time was studied with the foil penetration technique. Results Severe pitting occurred and developed deep into the 2A97 aluminium alloy substrate after exposure in marine atmosphere. Time of foil penetration during environmental testing could be determined by examination the time of appearance of electrolyte from the back of the foil. After measurement of the penetration time of foils in various thicknesses, the relationship between the depth of the fastest growing corrosion pit and time could be determined. Conclusions In neutral salt fog testing environment, it generally takes the same time for 2A97 aluminium alloy and AA2024 aluminum alloy to reach the same maximum corrosion depth. |
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