深海低溶解氧环境下Al-Zn-In-Mg-Ti牺牲阳极性能研究

doi:10.11902/1005.4537.2019.180

中国腐蚀与防护学报

2020, Vol. 40

Issue (6): 508-516 DOI: 10.11902/1005.4537.2019.180

研究报告

本期目录 | 过刊浏览

深海低溶解氧环境下Al-Zn-In-Mg-Ti牺牲阳极性能研究

孙海静(

), 覃明, 李琳

沈阳理工大学环境与化学工程学院沈阳 110159

Performance of Al-Zn-In-Mg-Ti Sacrificial Anode in Simulated Low Dissolved Oxygen Deep Water Environment

SUN Haijing(

), QIN Ming, LI Lin

School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China

全文: PDF(13139 KB) HTML

摘要:

对浅海中大量使用的Al-Zn-In-Mg-Ti牺牲阳极在深海低溶解氧环境下的性能进行了研究。通过恒电流法对Al-Zn-In-Mg-Ti牺牲阳极开路电位、工作电位、实际电容量、电流效率及溶解形貌等使役性能进行研究，并结合浸泡失重、动电位极化曲线、电化学阻抗谱、循环伏安等电化学方法以及SEM/EDS分析手段，探讨浅海现役Al-Zn-In-Mg-Ti牺牲阳极在深海低溶解氧环境下的电化学性能。结果表明：深海低溶解氧条件下，Al-Zn-In-Mg-Ti溶解速度减缓，活性元素的再沉积过程受到抑制，活化作用减弱，从而导致铝阳极表面氧化膜不易溶解，大量附着，造成其活化困难，放电性能下降，电流效率降低，阴极保护设计时需留出相应设计裕量。

关键词 ：深海环境, 低溶解氧, 牺牲阳极, 电化学性能

Abstract：

The performance of the Al-Zn-In-Mg-Ti sacrificial anode, which is usually used in shallow sea area, was studied in a simulated deep-sea water of low dissolved oxygen via weight loss measurement, galvanostatic method, potentiodynamic polarization curves, electrochemical impedance spectroscopy and cyclic voltammograms test and scanning electron microscope (SEM/EDS), in terms of the open circuit potential, work potential, actual electric capacity, electric current efficiency and corrosion morphology of the Al-Zn-In-Mg-Ti sacrificial anode. It was found that, the dissolution rate of the Al-Zn-In-Mg-Ti sacrificial anode decreased in the simulated seawater of a low dissolved oxygen. The re-deposition process of the active elements was suppressed and the oxide scale on the anode surface was hard to be dissolved. Correspondingly, both the discharge performance and the current efficiency decrease, therefore a corresponding design margin should be set aside in the design course of cathodic protection.

Key words： deep water environment low dissolved oxygen sacrificial anode electrochemical performance

收稿日期: 2019-10-15

ZTFLH:

TG174

基金资助:辽宁省博士启动基金(201601181);辽宁省教育厅科学研究一般项目(L2015464);辽宁省教育厅青年科技人才“育苗”项目(LG201928)

通讯作者: 孙海静 E-mail: hjsun@alum.imr.ac.cn

Corresponding author: SUN Haijing E-mail: hjsun@alum.imr.ac.cn

作者简介: 孙海静，女，1985年生，博士，副教授

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引用本文:

孙海静, 覃明, 李琳. 深海低溶解氧环境下Al-Zn-In-Mg-Ti牺牲阳极性能研究[J]. 中国腐蚀与防护学报, 2020, 40(6): 508-516.
Haijing SUN, Ming QIN, Lin LI. Performance of Al-Zn-In-Mg-Ti Sacrificial Anode in Simulated Low Dissolved Oxygen Deep Water Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 508-516.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.180 或 https://www.jcscp.org/CN/Y2020/V40/I6/508

图1 Al-Zn-In-Mg-Ti牺牲阳极在两种溶解氧条件下的开路电位随时间的变化

图2 Al-Zn-In-Mg-Ti牺牲阳极在两种溶解氧条件下工作电位随时间的变化

表1 Al-Zn-In-Mg-Ti牺牲阳极在两种溶解氧含量下的电化学性能

图3 Al-Zn-In-Mg-Ti牺牲阳极在两种溶解氧条件下恒电流实验后宏观腐蚀形貌

图4 Al-Zn-In-Mg-Ti牺牲阳极在两种溶解氧条件下恒电流实验除锈后微观腐蚀形貌

表2 Al-Zn-In-Mg-Ti合金在两种溶解氧条件下浸泡168 h后的腐蚀失重测试结果

图5 Al-Zn-In-Mg-Ti合金在两种溶解氧含量下动电位极化曲线

图6 Al-Zn-In-Mg-Ti合金在两种溶解氧条件下循环伏安曲线

图7 Al-Zn-In-Mg-Ti合金在两种溶解氧条件下的Nyquist谱

图8 EIS数据对应的等效电路图

表3 Al-Zn-In-Mg-Ti合金在两种溶解氧条件下EIS数据的拟合结果

图9 Al-Zn-In-Mg-Ti合金在两种溶解氧条件下浸泡168 h后宏观腐蚀形貌

图10 Al-Zn-In-Mg-Ti合金在两种溶解氧条件下浸泡168 h后微观腐蚀形貌

图11 Al-Zn-In-Mg-Ti合金在两种溶解氧条件下浸泡168 h后表面EDS结果

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