深海环境5A06铝合金腐蚀行为与表面特性

doi:10.11902/1005.4537.2022.102

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 352-358 CSTR: 32134.14.1005.4537.2022.102 DOI: 10.11902/1005.4537.2022.102

中国腐蚀与防护学报编委、青年编委专栏

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深海环境5A06铝合金腐蚀行为与表面特性

段体岗, 李祯, 彭文山, 张彭辉, 丁康康, 郭为民, 侯健, 马力, 许立坤(

)

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 Characteristics of 5A06 Al-alloy Exposed in Natural Deep-sea Environment

DUAN Tigang, LI Zhen, PENG Wenshan, ZHANG Penghui, DING Kangkang, GUO Weimin, HOU Jian, MA Li, XU Likun(

)

State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266237, China

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摘要:

通过自主研制的高效串型深海环境试验装置在西太平洋深海自然环境下开展了5A06铝合金的腐蚀行为实验，分析了5A06铝合金在500，800，1200和2000 m深海环境下暴露1 a的腐蚀形貌、腐蚀规律和电化学行为。实海结果显示，5A06铝合金的腐蚀形式以点蚀为主，平均腐蚀速率随海水深度增加先升高后降低，最大值出现在水深500 m处，为17 μm/a，是浅表海水环境下的3.1倍；而在800~2000 m水深范围，5A06铝合金腐蚀状况大大减弱，腐蚀速率在0.9~1.4 μm/a水平，800 m时仅为浅表海水的0.21倍，2000 m时则为0.14倍。电化学测试结果显示，试样自腐蚀电位随海水深度增加而正移，2000 m深度下达到-0.640 V (vs. Ag/AgCl)；电荷转移阻抗随着试验深度的增加而显著增大，2000 m深度下达到了最大值，为1.91×10⁸ Ω·cm²。

关键词 ：西太平洋, 深海环境, 5A06铝合金, 界面特性

Abstract：

The deep-sea corrosion behavior of 5A06 Al-alloy was investigated through field exposure corrosion testing in the Western Pacific Ocean via a home-made cascade-type testing facility. After being exposed for 1 a in the marine environment at the depth of 500, 800, 1200 and 2000 m, respectively, the tested samples of 5A06 Al-alloy were examined by means of electrochemical test methods, scanning electron microscope with energy dispersive spectrometer and X-ray photoelectron spectroscope, in terms of electrochemical performance, corrosion morphology and corrosion characteristics etc. Results show that the average corrosion rate of 5A06 Al-alloy increases and then decreases with the increasing depth. The maximum average corrosion rate is 17 μm/a at the depth of 500 m, which is 3.1 times superior to that in the shallow. At the depth ranges from 800 m to 2000 m, the corrosion rate varies within 0.9-1.4 μm/a. Electrochemical test results show that the self-corrosion potential shifts positively with the increasing depth, while the charge transfer resistance increases.

Key words： Western Pacific Ocean deep-sea corrosion 5A06 Al-alloy surface characteristics

收稿日期: 2022-04-11 32134.14.1005.4537.2022.102

ZTFLH:

TD123

作者简介: 段体岗，男，1987年生，博士，高级工程师

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引用本文:

段体岗, 李祯, 彭文山, 张彭辉, 丁康康, 郭为民, 侯健, 马力, 许立坤. 深海环境5A06铝合金腐蚀行为与表面特性[J]. 中国腐蚀与防护学报, 2023, 43(2): 352-358.
Tigang DUAN, Zhen LI, Wenshan PENG, Penghui ZHANG, Kangkang DING, Weimin GUO, Jian HOU, Li MA, Likun XU. Corrosion Characteristics of 5A06 Al-alloy Exposed in Natural Deep-sea Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 352-358.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.102 或 https://www.jcscp.org/CN/Y2023/V43/I2/352

图1 5A06铝合金在不同深度下暴露1 a的宏观腐蚀形貌

图2 5A06铝合金5A06在500，800，1200和2000 m深海环境下暴露1 a的SEM图

图3 不同深度下5A06铝合金腐蚀产物EDS结果图

表1 5A06铝合金在暴露1 a后的Tafel分析结果

表2 EIS图谱拟合结果

图4 不同深度下5A06铝合金表面膜成分XPS分析

图5 5A06铝合金腐蚀速率随是实验深度变化及点蚀深度变化

图6 5A06铝合金在暴露1 a后的Tafel曲线

图7 5A06铝合金的EIS谱图及等效电路图

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