|
| Galvanic Corrosion in Cyclic Wet-Dry Immersion Test of 7A52 Aluminium Alloy |
| Received:December 07, 2015 Revised:April 15, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2016.02.005 |
| KeyWord:7A52 galvanic corrosion cyclic wet-dry immersion test |
| Author | Institution |
| WANG Wei |
The Academy of Armored Forces Engineering，Beijing ，China |
| HUANG Yan-bin |
The Academy of Armored Forces Engineering，Beijing ，China |
| XU Ke-ke |
The Academy of Armored Forces Engineering，Beijing ，China |
| ZHOU Ke-ke |
The Academy of Armored Forces Engineering，Beijing ，China |
| DONG Xiao-lin |
The Academy of Armored Forces Engineering，Beijing ，China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To investigate galvanic corrosion phenomenon of 7A52 aluminum alloy used in cyclic wet-dry immersion test in marine environment. Methods The sample was soaked in 3.5% NaCl solution in all of the test cycle of 504 hours, with full immersion as control. Galvanic current and galvanic voltage under cyclic dry-wet immersion condition between 7A52 and 5A06, 38CrSi were tested, and the surface morphology after corrosion was analyzed. Results The galvanic current of 7A52-5A06 cyclic wet-dry immersion sample changed little, and that of full immersion sample changed much in the early stage, and was only about 1/8 in the later stage. The galvanic currents of 7A52-38CrSi full immersion sample and cyclic wet-dry immersion sample were almost the same. With the progress of the experiment, the difference of galvanic current between cyclic wet-dry immersion sample and full immersion sample became bigger, with the galvanic current increasing about 10 times than that in the early stage. The surface corrosion products of full immersion sample were dense, while those were loose of cyclic wet-dry immersion sample. Conclusion Under the condition of cyclic wet-dry immersion in 3.5% NaCl solution, the average galvanic corrosion speed of 7A52-5A06 and 7A52-38CrSi was faster than under the condition of full immersion. Under the condition of cyclic wet-dry immersion, the surface morphology of 7A52-5A06 and 7A52-38CrSi had a big difference after corrosion, and the corrosion resistance of 5A06 was better than 7A52 under the same experimental conditions. |
| Close |
|
|
|