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| Corrosion Behavior of Al-Mg-Cu Aluminum Alloy |
| Received:May 11, 2015 Revised:August 15, 2015 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2015.04.006 |
| KeyWord:2D12 aluminum alloy intergranular corrosion exfoliation stress corrosion cracking |
| Author | Institution |
| SUN Zhi-hua |
AVIC Beijing Institute of Aeronautical Materials，Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material，Beijing ，China |
| GAO Jian |
AVIC Beijing Institute of Aeronautical Materials，Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material，Beijing ，China |
| WANG Qiang |
AVIC Beijing Institute of Aeronautical Materials，Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material，Beijing ，China |
| WANG Zhi-shen |
AVIC Beijing Institute of Aeronautical Materials，Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material，Beijing ，China |
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| Abstract: |
| Objective To study the anti-environment corrosion properties of 2D12 alloy. Methods According to the standard test methods, the corrosion tests including intergranular corrosion test, exfoliation test and stress corrosion cracking test were carried out for 2D12 Al-Mg-Cu aluminum alloys with different specifications, and the test data was analyzed and evaluated. Results The intergranular corrosion depth, exfoliation degree, stress corrosion cracking time and threshold stress intensity factor for susceptibility to stress corrosion cracking (KICC) were obtained. There was intergranular corrosion tendency for 2D12 aluminum in natural aging condition, and the maximum intergranular corrosion depth was 0.18 mm. The anti-exfoliation corrosion property of 2D12 aluminum alloys with different specifications varied from P to Ec degree. The tensile stress corrosion cracking time decreased with the increase of the test stress, and the critical stress corrosion threshold of two sheets (δ=1.5 mm and δ=2.0 mm) and EL2805 section bar were 160, 140 and 230 MPa, respectively. The KICC values of S-L and S-T orientation were 22.6 MPa·m1/2 and 27.1 MPa·m1/2, respectively. Conclusion The anti-stress corrosion test of 2D12 aluminum alloy showed that the anti-SCC property of S-L orientation was lower than that of S-T orientation, which was in accordance with the C-ring result, and the fractographies of 2D12 aluminum revealed typical intergranular fracture stress corrosion cracking characteristics. |
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