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| Corrosion Behavior of ZAlSi7Mg Al-alloy in Deep-sea Environments in Western Pacific Ocean and South China Sea |
PENG Wenshan( ), DUAN Tigang, MA Li, XIN Yonglei, CHENG Wenhua, LIU Shaotong |
| State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China |
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Abstract The corrosion behavior of ZAlSi7Mg Al-alloy in low temperature and high pressure deep-sea environment was studied by using a home-made high-efficiency cascade device, whilst the long-term corrosion rate, pitting depth, corrosion morphology and corrosion products of ZAlSi7Mg Al-alloy at depth of 500, 800, 1200 and 2000 m in test sites located in the Western Pacific Ocean and the South China Sea were comparatively assessed by means of SEM, EDS and XPS techniques. The results show that: (1) The corrosion rate and corrosion product thickness of ZAlSi7Mg Al-alloy at 500 and 2000 m depths are higher than those at 800 and 1200 m depths respectively in the Western Pacific Ocean, and the average pitting depth of ZAlSi7Mg Al-alloy gradually decreases with the increase of the test depth. (2) The corrosion types of ZAlSi7Mg Al-alloy in the deep-sea environment are mainly pitting corrosion, crevice corrosion and intergranular corrosion. (3) In the deep-sea environment of the Western Pacific Ocean, the corrosion products of the alloy tested at larger depth have higher Al content, but lower Mg content, in comparison to those tested at shallower depth. The corrosion products mainly include Al2O3, Al(OH)3, Al2SiO5 and Mg(OH)2. (4) The ZAlSi7Mg Al-alloy presents different corrosion behavior, namely its corrosion rate and pitting depth for testing at the same seawater depth in the Western Pacific Ocean and the South China Sea respectively. In the South China Sea, the corrosion rate of Al-alloy at 2000 m depth is slightly less than that at 1200 m depth, while the pitting depth of Al-alloy at 2000 m depth is slightly greater than that at 1200 m depth. However, for the Western Pacific Ocean, change trends of corrosion rate and pitting depth of ZAlSi7Mg Al-alloy in these two depths are just opposite to those in the South China Sea.
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Received: 08 July 2022
32134.14.1005.4537.2022.226
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| Fund: National Natural Science Foundation of China(51931008) |
Corresponding Authors:
PENG Wenshan, E-mail: pengwenshan1386@126.com
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