Corrosion Behavior of N6 and Monel400 Nickel Alloy in Deep Sea Environment of South China Sea

doi:10.11902/1005.4537.2013.104

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (2): 165-170 DOI: 10.11902/1005.4537.2013.104

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Corrosion Behavior of N6 and Monel400 Nickel Alloy in Deep Sea Environment of South China Sea

SUN Feilong, LU Lin, LI Xiaogang, XIAO Kui, WU Junsheng, WANG Song

Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract The corrosion behavior of N6 nickel and Monel400 nickel alloy in 800 and 1200 m deep sea environment of South China Sea was studied by field test. The morphology and composition of corrosion product were examined by means of SEM, EDS and XRD techniques. The results indicated that the resistance to localized corrosion of Monel400 nickel alloy was better than that of N6 nickel. The green corrosion product of N6 nickel was composed of NiCl₂6H₂O with a small amount of CaCO₃ and MgCO₃, under which severe tunnel corrosion occurred, while localized corrosion induced perforation even took place on N6 nickel samples. However, shallow and large size corrosion pits formed on Monel400 nickel alloy, which were covered by green corrosion product consisted of (CuNi)₂Cl(OH)₃. Comparing with the data of literatures, the maximum pit depth of N6 and Monel400 nickel alloy decreased as the depth of test side increased.

Key words: nickel alloy pitting corrosion tunnel corrosion deep sea field test

Received: 06 June 2013

ZTFLH:

TG172.5

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SUN Feilong, LU Lin, LI Xiaogang, XIAO Kui, WU Junsheng, WANG Song. Corrosion Behavior of N6 and Monel400 Nickel Alloy in Deep Sea Environment of South China Sea. Journal of Chinese Society for Corrosion and protection, 2014, 34(2): 165-170.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.104 OR https://www.jcscp.org/EN/Y2014/V34/I2/165

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