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| Short-term Electrochemical Corrosion Behavior of 7B04 Aluminum Alloy and 30CrMnSiA Steel |
| Received:July 07, 2017 Revised:January 15, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.01.008 |
| KeyWord:7B04 aluminum alloy 30CrMnSiA steel galvanic corrosion rust layer |
| Author | Institution |
| CHEN Yue-liang |
Naval Aeronautical Engineering Institute, Qingdao , China |
| ZHAO Hong-jun |
Naval Aeronautical Engineering Institute, Qingdao , China |
| WANG Chen-guan |
Naval Aeronautical Engineering Institute, Qingdao , China |
| BIAN Gui-xue |
Naval Aeronautical Engineering Institute, Qingdao , China |
| ZHANG Yong |
Naval Aeronautical Engineering Institute, Qingdao , China |
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| Abstract: |
| Objective To study electrochemical performance of 7B04 Aluminum alloy and 30CrMnSiA alloy steel samples. Methods The electrochemical test, scanning electron microscopy (SEM), corrosion pit depth test were adopted to analyze and test whether 7B04 Aluminum alloy and 30CrMnSiA alloy steel samples were immersed in natural seawater or not, to obtain micro-morphology and corrosion pit depth and electrochemical performance with or without rust on the surface. Results The self-corrosion current of 7B04 aluminum alloy and 30CrMnSiA steel increased with the increase of NaCl concentration. Because of obvious potential difference between them, galvanic corrosion occurred after contacting. The galvanic current was related to the ratio of the cathode to anode area and the concentration of NaCl. Increase of the cathode to anode area ratio or NaCl concentration would lead to intensifying of galvanic effect. After short immersion in seawater, the rust layer on the surface of 7B04 aluminum alloy did not inhibit the corrosion, but increased the self–corrosion. However, the galvanic effect was weakened in deed. Conclusion Coastal equipment in use process should be avoided to work under the aluminum alloy in the rust layer |
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