<strong>Al-Zn-In</strong>系牺牲阳极在模拟海洋环境下的电化学性能研究

doi:10.11902/1005.4537.2023.362

中国腐蚀与防护学报

2024, Vol. 44

Issue (5): 1223-1233 CSTR: 32134.14.1005.4537.2023.362 DOI: 10.11902/1005.4537.2023.362

研究报告

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Al-Zn-In系牺牲阳极在模拟海洋环境下的电化学性能研究

张炬焕¹, 刘静¹(

), 彭晶晶¹, 张弦¹, 吴开明¹^,²

1 武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心，耐火材料与冶金省部共建国家重点实验室，冶金工业过程系统科学湖北省重点实验室，武汉 430081
2 材谷金带(佛山)金属复合材料有限公司，佛山 528000

Electrochemical Performance of a Novel Al-Zn-In-Sn-La Sacrificial Anode Alloy in Simulated Marine Environments

ZHANG Juhuan¹, LIU Jing¹(

), PENG Jingjing¹, ZHANG Xian¹, WU Kaiming¹^,²

1 Collaborative Innovation Center for Advanced Steels, State Key Laboratory of Refractory Material and Metallurgy, Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081, China
2 Metals Valley & Band (Foshan) Metallic Composite Co., Ltd., Foshan 528000, China

引用本文:

张炬焕, 刘静, 彭晶晶, 张弦, 吴开明. Al-Zn-In系牺牲阳极在模拟海洋环境下的电化学性能研究[J]. 中国腐蚀与防护学报, 2024, 44(5): 1223-1233.
Juhuan ZHANG, Jing LIU, Jingjing PENG, Xian ZHANG, Kaiming WU. Electrochemical Performance of a Novel Al-Zn-In-Sn-La Sacrificial Anode Alloy in Simulated Marine Environments[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1223-1233.

全文: PDF(16001 KB) HTML

摘要:

在商用Al-Zn-In牺牲阳极基础上，自行设计冶炼了Al-Zn-In-Sn-La牺牲阳极合金，并在模拟浅海和深海环境下，测试了两种合金的开路电位、动电位极化曲线、恒电位极化曲线、腐蚀失重等，对比分析讨论了两种牺牲阳极的放电量和电流效率。结果表明：模拟海洋环境下，冶炼合金放电量较商用合金略有提高，这与In、Zn、Sn协同活化作用破坏钝化膜完整性、增加钝化膜阴阳离子空位促进离子迁移有关。同时，冶炼合金电流效率较商用合金显著提高，浅海环境下电流效率由75.87%提高至90.01%，深海环境下由75.48%提高至82.99%。冶炼合金自腐蚀速率低、晶界偏析相与基体电位差较小导致微电偶作用减弱、稀土元素细化晶界促进均匀溶解等共同作用提高了电流效率。模拟深海环境下，两种合金的放电量较浅海环境大幅降低，这主要是由于低温、低含氧量导致离子溶解沉积速率降低，牺牲阳极活性点减少，Al合金牺牲阳极发生钝化。为克服深海放电量低下的问题，高熵合金的思路也许能显著提高活化合金元素的固溶度，从而提高其深海放电性能。

关键词 ： Al合金牺牲阳极, 模拟海洋环境, 放电量, 电流效率

Abstract：

Taking the commercial sacrificial anode alloy Al-Zn-In as reference, a novel alloy Al-Zn-In-Sn-La was designed and made. Then the performance of the two alloys in simulated conditions of shallow-sea and deep-sea was comparatively assessed via measurements of corrosion mass loss, open-circuit potential, potentiodynamic polarization curves, and potentiostatic polarization curves. Results showed that, the discharge capacity of the Al-Zn-In-Sn-La alloy was slightly higher than that of the commercial Al-Zn-In alloy in the simulated marine environments, which may be related to the breakdown of the integrity of the passive film and the improvement of the anion and cation vacancies of the passivation film to promote ion migration, due to the synergistic activation effect of In, Zn, and Sn. Meanwhile, the novel alloy presents current efficiency of 90.01%, which was much higher than 75.87% of the commercial alloy in shallow sea condition, similarly, that was 82.99% and 75.48% in the deep-sea conditions, respectively. All the actions of the low free-corrosion rate of the alloy, the weakened micro-galvanic effect between the precipitated phase along grain boundaries with the matrix, and the refinement of grain boundaries by rare earth elements to promote uniform dissolution may significantly promote the improvement of the current efficiency of the novel alloy. It is worth mentioning that, the discharge capacity of the two alloys are significantly reduced in the simulated deep-sea environment. Which may be ascribed to the lower temperature and oxygen content, the slow-down of dissolution and deposition rate of ions, which reduces the surface-active sites of the alloys, leading to the passivation of the sacrificial anode Al-based alloys. It is expected that the designment of high entropy alloys might be an effective approach to overcome the problem of low discharge capacity of sacrificial anode alloys in deep-sea environment, by significantly improving the solubility of active alloying elements, and thereby improving the deep-sea discharging performance.

Key words： Al alloy sacrificial anode simulated marine environment discharge capacity current efficiency

收稿日期: 2023-11-17 32134.14.1005.4537.2023.362

ZTFLH:

TG174

基金资助:湖北省教育厅科学技术研究计划重点项目(D20221103);冶金工业过程系统科学湖北省重点实验室开放基金(Y202204)

通讯作者: 刘静，E-mail：liujing2015@wust.edu.cn，研究方向为金属材料深海腐蚀与防护

Corresponding author: LIU Jing, E-mail: liujing2015@wust.edu.cn

作者简介: 张炬焕，男，1999年生，硕士生

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图1 深海高压反应釜结构示意图

图2 商用Al-Zn-In合金和冶炼Al-Zn-In-Sn-La合金金相显微形貌

图3 商用Al-Zn-In牺牲阳极显微形貌及EPMA分析结果

图4 冶炼的Al-Zn-In-Sn-La牺牲阳极显微形貌及EPMA分析结果

图5 模拟浅海和深海环境下Al-Zn-In和Al-Zn-In-Sn-La牺牲阳极的腐蚀速率

图6 Al-Zn-In和Al-Zn-In-Sn-La牺牲阳极模拟海洋环境浸泡10 d后腐蚀形貌

图7 模拟浅海和深海环境下Al-Zn-In和Al-Zn-In-Sn-La牺牲阳极动电位极化曲线对比

表1 两种牺牲阳极动电位极化曲线Tafel外推拟合的腐蚀电流密度与腐蚀电位

图8 模拟浅海和深海环境下Al-Zn-In和Al-Zn-In-Sn-La牺牲阳极OCP对比

图9 模拟浅海和深海环境下Al-Zn-In和Al-Zn-In-Sn-La牺牲阳极恒电位极化曲线

表2 两种牺牲阳极合金在不同模拟海洋环境下的放电性能

图10 Al-Zn-In和Al-Zn-In-Sn-La牺牲阳极在两种模拟海洋环境下恒电位极化后溶解形貌

图11 Al-Zn-In和Al-Zn-In-Sn-La牺牲阳极表面形貌及SKPFM分析结果

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