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| Study on the Galvanic Corrosion of Aluminium Alloy and Stainless Steel under a Thin Electrolyte Film |
| Received:August 31, 2014 Revised:February 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2015.01.001 |
| KeyWord:aluminium alloy stainless steel galvanic corrosion morphological analysis ELS |
| Author | Institution |
| LIU Yan-jie |
Institute of Metal Research， Chinese Academy of Sciences，Shenyang ，China |
| WANG Zhen-yao |
Institute of Metal Research， Chinese Academy of Sciences，Shenyang ，China |
| KE Wei |
Institute of Metal Research， Chinese Academy of Sciences，Shenyang ，China |
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| Abstract: |
| Objective To study the galvanic corrosion behavior and mechanism of aluminium alloy coupled with stainless steel. Methods Galvanic samples were prepared according to the ASTM G149 standard, and the galvanic corrosion process between the 2024 aluminium alloy and the 316L stainless steel under the thin electrolyte film was simulated in a cyclic corrosion tester. Samples were taken out after 6, 12, 18, 24 and 30 d of corrosion. Mass loss analysis, morphological analysis of sections and pits, as well as electrochemical impedance spectroscopy were used to analyze the corroded samples. Results The mass loss of 2024 AA coupled with 316L SS was about 10 times that of the mass loss of 2024 AA without coupling. A corrosion product layer with a thickness of about 20 μm was formed on the coupled 2024 AA after 6 d of corrosion, and the corrosion product layer became more and more thick and compact with the corrosion time. The area of pits on the coupled 2024 AA was increased, while the depth varied to a smaller extent. Conclusion Galvanic corrosion did not only promote the corrosion of 2024 AA， but also changed the corrosion process. And the effects were much more obvious at the later stage of the corrosion than the initial stage. |
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