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| Corrosion Performance and Mechanism of Typical Aviation Metal Materials under Different Acid Salt Spray Test Environments |
| Received:October 29, 2018 Revised:April 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.04.007 |
| KeyWord:environmental worthiness corrosion acid salt spray salt/SO2 composite test |
| Author | Institution |
| LI Ming |
China Aero-Polytechnology Establishment, Beijing , China |
| ZHU Jin-yang |
China Aero-Polytechnology Establishment, Beijing , China |
| LI Gang |
China Aero-Polytechnology Establishment, Beijing , China |
| ZHU Meng |
China Aero-Polytechnology Establishment, Beijing , China |
| FU Yun |
China Aero-Polytechnology Establishment, Beijing , China |
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| Abstract: |
| Objective To compare and analyze environmental effect and mechanism difference of vitriol fog test and salt spray/SO2 composite test. Methods In this work, three metal specimens (4130 Cr-plated specimen, 40CrNiSi Ni-plated specimen, 2A12 aluminum alloy specimen) and two self-locking nuts (30CrMnSiA Cd-plated nut, 30CrMnSiA Zn-plated nut) were selected as experimental samples to conduct corrosion tests under two different acid salt spray test conditions (sulfate salt spray test and salt/SO2 spray test in appendix A4-X4 of ASTM G85). SEM and EDS were used to investigate the morphology and chemical composition of the corrosion film formed on the samples. In this way, the environmental effects and mechanism differences between the two acetic acid-salt spray test conditions were compared and analyzed. Furthermore, CMAS technique was used to study the environmental corrosion severity differences between the two acid salt spray test conditions. Results Salt fog/SO2 composite test under the condition of CMAS electrode corrosion depth is about 10 times of that under the same cycle sulfate fog test. During salt fog/SO2 composite test, the sample surface corrosion products are detected of S element. Compared with sulfate fog test, salt spray/SO2 composite test and field carrier platform environment has better consistency. Conclusion The present salt/SO2 composite test of US arm is more consistent with the outfield environment. |
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