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| Corrosion Evaluation Method of Aluminum alloy Chemical Oxidation Film after Salt Spray Test |
| Received:October 12, 2020 Revised:January 04, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.04.010 |
| KeyWord:aluminum alloy chemical oxidation film Alodine-1200S corrosion pitting evaluation method |
| Author | Institution |
| ZHENG Hong |
Chengdu Aircraft Industry Group Co.,Ltd., Chengdu , China |
| PENG Tao |
Chengdu Aircraft Industry Group Co.,Ltd., Chengdu , China |
| SHU Chang |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| YANG Yan |
Chengdu Aircraft Industry Group Co.,Ltd., Chengdu , China |
| WANG Hui |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| The evaluation basis of corrosion point on surface of 2024 aluminum alloy for aircraft after salt spray test of alodine 1200S chemical oxide film is established.The corrosion morphology and characteristics of aluminum alloy chemical oxide film after salt spray test are characterized by visual, SEM microscopic, energy spectrum analysis and electrochemical impedance test. After the test, when the size of typical corrosion characteristics on the surface of the sample is greater than or equal to 0.15 mm, all the inspectors with normal vision can visually see it. The visible black spots, the typical cometary tail or only the comet tail and other morphologies of the chemical transformation film and substrate have been corroded, and the corrosion resistance of the film layer with local corrosion points has decreased significantly, losing the ability to block the corrosive medium. The corrosion point can not be determined as only the non-compliance with the visible and matrix corrosion characteristics. When black spots are visible to the naked eye, the typical cometary tail or only the comet tail can be judged as corrosion spots. Similar methods can be adopted to study the evaluation method of corrosion spots in the actual production inspection and test, and the corrosion maps and evaluation criteria of corrosion spots after the salt spray test of aluminum alloy surface treatment can be established. |
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