ZAlSi7Mg铝合金在深海环境中的腐蚀行为研究

doi:10.11902/1005.4537.2022.226

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 516-524 CSTR: 32134.14.1005.4537.2022.226 DOI: 10.11902/1005.4537.2022.226

研究报告

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ZAlSi7Mg铝合金在深海环境中的腐蚀行为研究

彭文山(

), 段体岗, 马力, 辛永磊, 程文华, 刘少通

中国船舶集团有限公司第七二五研究所海洋腐蚀与防护重点实验室青岛 266237

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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摘要:

为研究深海低温高压环境中ZAlSi7Mg铝合金的腐蚀行为，采用深海高效串型试验装置进行西太平洋海域腐蚀试验，利用SEM、EDS、XPS等技术分析了ZAlSi7Mg铝合金在500、800、1200和2000 m海深下的长周期腐蚀速率、点蚀深度、腐蚀形貌及腐蚀产物，并与中国南海海域深海腐蚀规律进行对比。结果表明：(1) ZAlSi7Mg铝合金在西太平洋500和2000 m深度处的腐蚀速率和腐蚀产物厚度均高于800和1200 m深度处，且随着海水深度增加，铝合金平均点蚀深度逐渐减小；(2) 深海环境中ZAlSi7Mg铝合金的腐蚀类型主要是点蚀、缝隙腐蚀和晶间腐蚀；(3) 在西太平洋深海环境中，试验深度较大处试样与较浅处试样相比，表面腐蚀产物中含Al化合物含量较高，而含Mg的化合物含量较低，腐蚀产物主要包括Al₂O₃、Al(OH)₃、Al₂SiO₅和Mg(OH)₂。(4) 在西太平洋和中国南海同一海水深度处，ZAlSi7Mg铝合金的腐蚀速率和点蚀深度均存在较大差别。在中国南海2000 m海深处铝合金腐蚀速率略小于1200 m海深处，而2000 m海深处点蚀深度略大于1200 m海深处，而在西太平洋海域，这两个海深处的腐蚀速率和点蚀深度变化规律与中国南海海域的相反。

关键词 ：深海, ZAlSi7Mg铝合金, 腐蚀, 实海试验

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.

Key words： deep sea ZAlSi7Mg Al-alloy corrosion real sea test

收稿日期: 2022-07-08 32134.14.1005.4537.2022.226

ZTFLH:

TG172

基金资助:国家自然科学基金(51931008)

通讯作者: 彭文山，E-mail: pengwenshan1386@126.com，研究方向为海洋环境腐蚀、多相流冲蚀及腐蚀/冲蚀仿真

Corresponding author: PENG Wenshan, E-mail: pengwenshan1386@126.com

作者简介: 彭文山，男，1987年生，博士，高级工程师

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引用本文:

彭文山, 段体岗, 马力, 辛永磊, 程文华, 刘少通. ZAlSi7Mg铝合金在深海环境中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(3): 516-524.
PENG Wenshan, DUAN Tigang, MA Li, XIN Yonglei, CHENG Wenhua, LIU Shaotong. Corrosion Behavior of ZAlSi7Mg Al-alloy in Deep-sea Environments in Western Pacific Ocean and South China Sea. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 516-524.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.226 或 https://www.jcscp.org/CN/Y2023/V43/I3/516

图1 ZAlSi7Mg铝合金在不同海深下的腐蚀速率及点蚀深度

图2 ZAlSi7Mg铝合金深海腐蚀2 a去除腐蚀产物前后宏观形貌

图3 ZAlSi7Mg铝合金深海腐蚀2 a后微观形貌

图4 ZAlSi7Mg铝合金深海腐蚀2 a去除腐蚀产物后微观形貌

表1 在不同深度海水环境中腐蚀产物元素组成 (atomic fraction/%)

图5 ZAlSi7Mg铝合金试样在不同深度海水中暴露2 a后的表面腐蚀产物XPS分析

图6 ZAlSi7Mg铝合金在西太平洋和中国南海的深海腐蚀速率及点蚀深度

图7 中国南海不同海水深度处铝合金去除腐蚀产物前后腐蚀形貌

图8 中国南海海域铝合金腐蚀2 a去除腐蚀产物后微观形貌3D形貌

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