深水压力-流速交互作用下Al-Zn-In牺牲阳极的自腐蚀行为研究

doi:10.11902/1005.4537.2022.056

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 329-336 CSTR: 32134.14.1005.4537.2022.056 DOI: 10.11902/1005.4537.2022.056

中国腐蚀与防护学报编委、青年编委专栏

本期目录 | 过刊浏览

深水压力-流速交互作用下Al-Zn-In牺牲阳极的自腐蚀行为研究

张睿¹, 崔宇², 刘莉¹(

), 王福会¹

^1.东北大学沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819
^2.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Effect of Synergy of Water Pressure and Flow Speed on Free-corrosion Behavior of Al-Zn-In Sacrificial Anode in Deep-sea Envioronmem

ZHANG Rui¹, CUI Yu², LIU Li¹(

), WANG Fuhui¹

^1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

以海洋常用铝基牺牲阳极为对象，研究了深水压力、流速和二者同时作用下Al-Zn-In牺牲阳极的自腐蚀现象。结果表明，深水压力和流速均促进了Al-Zn-In牺牲阳极自腐蚀，但程度有所不同，流速的作用明显大于深水压力。在深水压力作用下Al-Zn-In牺牲阳极腐蚀坑的直径和深度增大，在流速作用下腐蚀坑数量明显增加，电化学反应电阻降低，另外流水对阳极基体的机械冲刷加剧了晶粒脱落，在深水压力-流速交互作用下显著促进阳极自腐蚀。

关键词 ：深水压力, 流速, 牺牲阳极, 自腐蚀

Abstract：

The effect of synergy of water pressure and water flow on the free-corrosion behavior of Al-Zn-In alloy, a common Al-based sacrificial anode material, was studied via a home-made test set for regulating water pressure and flow rate aiming to simulate the deep-sea environment. The results show that both the water pressure and water flow could promote the free-corrosion of the Al-Zn-In sacrificial alloy. The effect of the water flow is obviously greater than that of water pressure. Under high water pressure, the diameter and depth of the corrosion pits increased. By high water flow rate, the number of pits increased significantly, and the electrochemical reaction resistance decreased. In addition, the erosion effect of flowing water on the alloy substrate may enhance the falling-off process of grains from the alloy. Generally, the free-corrosion of Al-Zn-In sacrificial alloy is significantly enhanced in the presence of synergetic effect of electrochemical corrosion and water erosion.

Key words： hydrostatic pressure flow sacrificial anode self-corrosion

收稿日期: 2022-03-04 32134.14.1005.4537.2022.056

ZTFLH:

TG174

基金资助:国家自然科学基金(U20b2026)

作者简介: 张睿，男，1997年生，硕士生

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引用本文:

张睿, 崔宇, 刘莉, 王福会. 深水压力-流速交互作用下Al-Zn-In牺牲阳极的自腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(2): 329-336.
Rui ZHANG, Yu CUI, Li LIU, Fuhui WANG. Effect of Synergy of Water Pressure and Flow Speed on Free-corrosion Behavior of Al-Zn-In Sacrificial Anode in Deep-sea Envioronmem. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 329-336.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.056 或 https://www.jcscp.org/CN/Y2023/V43/I2/329

图1 实验所用Al-Zn-In牺牲阳极合金样品的金相组织及X射线衍射图谱

图2 抛光后未经蚀刻的Al-Zn-In合金样品的微观形貌及表面EDS分析结果

图3 不同环境条件下Al-Zn-In自腐蚀失重

图4 不同环境条件下Al-Zn-In牺牲阳极自腐蚀48 h的阻抗谱及其等效电路

表1 不同环境条件下Al-Zn-In牺牲阳极自腐蚀48 h后的EIS拟合结果

图5 Al-Zn-In牺牲阳极浸泡1 h后去除腐蚀产物宏观形貌

图6 静态条件下Al-Zn-In牺牲阳极腐蚀1 h的背散射形貌及表面EDS分析结果

图7 Al-Zn-In牺牲阳极浸泡120 h后去除腐蚀产物微观形貌

图8 不同条件下Al-Zn-In牺牲阳极腐蚀120 h后的截面背散射形貌

图9 Al-Zn-In牺牲阳极在3.5%NaCl溶液中自腐蚀溶解示意图

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