铜锡合金阳极在熔融碳酸盐中氧化膜的形成及其防护性能

doi:10.11902/1005.4537.2016.174

中国腐蚀与防护学报

2017, Vol. 37

Issue (5): 421-427 DOI: 10.11902/1005.4537.2016.174

研究报告

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铜锡合金阳极在熔融碳酸盐中氧化膜的形成及其防护性能

杜开发,王彬,甘复兴,汪的华(

)

武汉大学资源与环境科学学院湖北省资源与能源可持续利用技术示范型国际科技合作基地武汉 430072

Corrosion Performance of Oxide Scales on Bronze QSn7-0.2 Anode in Molten Carbonates

Kaifa DU,Bin WANG,Fuxing GAN,Dihua WANG(

)

International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province, School of Resource and Environmental Science, Wuhan University, Wuhan 430072, China

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摘要:

通过动电位扫描阳极氧化成膜、恒电位预氧化成膜以及开路电位浸泡预氧化成膜3种途径分别得到了3种氧化膜各有差异的QSn7-0.2铜锡合金电极。采用光学显微分析与XRD测试,表征了各氧化膜的形貌和成分,并且利用阳极极化曲线研究了3种成膜电极在450 ℃ Li-Na-K三元共晶熔融碳酸盐中作为惰性析氧阳极的可行性。结果表明,恒电位预氧化成膜以及开路电位浸泡预氧化成膜两种成膜方法均能够在QSn7-0.2铜锡合金阳极表面形成含SnO₂的氧化膜,该膜能够显著阻碍基体合金中Cu的阳极溶解腐蚀,并且对析氧反应具有确定的电催化性能。

关键词 ：铜锡合金, 熔融碳酸盐, 氧化膜, 钝化, 防护性能

Abstract：

Three different oxide scales on the surface of bronze QSn7-0.2 electrodes were prepared in Li-Na-K eutectic molten carbonates at 450°C via potentiodynamic polarization, potentiostatic polarization by 0.2 V and simple immersion by open circuit potential respectively, then were characterized by means of optical microscopy and X-ray diffractometer (XRD). While the feasibility of which as potential inert anode for electrochemical transformation of CO₂was assessed in the melt by electrochemical method. The result shows that besides Cu₂O and CuO, SnO₂is detected in the oxide scales of the bronze QSn7-0.2 electrodes oxidized via potentiostatic polarization by 0.2 V and simple immersion by open circuit potential. The oxide scales with SnO₂ can significantly prevent the bronze QSn7-0.2 anodes from corrosion and act also as electro-catalyzer for the oxygen evolution.

Key words： Cu-Sn alloy molten carbonate oxidation film passivation protection performance

收稿日期: 2016-09-22

基金资助:国家自然科学基金 (51325102,21673162) 和国家科技部国际科技合作专项 (2015DFA90750)

作者简介: 杜开发,男,1992年生,博士生

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引用本文:

杜开发,王彬,甘复兴,汪的华. 铜锡合金阳极在熔融碳酸盐中氧化膜的形成及其防护性能[J]. 中国腐蚀与防护学报, 2017, 37(5): 421-427.
Kaifa DU, Bin WANG, Fuxing GAN, Dihua WANG. Corrosion Performance of Oxide Scales on Bronze QSn7-0.2 Anode in Molten Carbonates. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 421-427.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.174 或 https://www.jcscp.org/CN/Y2017/V37/I5/421

图1 实验装置示意图

图2 QSn7-0.2、T2和Pt电极的阳极极化曲线及QSn7-0.2电极重复测试的阳极极化曲线

图3 QSn7-0.2电极阳极极化曲线测试前后的光学照片及极化后表面氧化膜的显微照片和 XRD谱

图4 QSn7-0.2电极阳极极化曲线测试过程中对电极还原产物的光学照片与XRD谱

图5 QSn7-0.2合金阳极0.2 V (vs Ag+/Ag)恒电位极化20 h的I-t曲线和极化前后的阳极极化曲线

图6 QSn7-0.2电极在0.2 V恒电位极化20 h前后的光学照片,极化后表面氧化膜的显微照片与XRD谱

图7 T2与QSn7-0.2电极在熔融碳酸盐中浸泡170 h的开路电位变化曲线,QSn7-0.2电极浸泡前后的阳极极化曲线

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