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

doi:10.11902/1005.4537.2016.174

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

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

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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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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

Received: 22 September 2016

Fund: Supported by National Natural Science Foundation of China (51325102, 21673162) and International Science & Technology Cooperation Program of China (2015DFA90750)

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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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.174 OR https://www.jcscp.org/EN/Y2017/V37/I5/421

Fig.1 Schematic diagram of the experimental set-up

Fig.2 Anodic polarization curves of QSn7-0.2, T2 and Pt (a) electrodes in molten Li₂CO₃-Na₂CO₃-K₂CO₃ at 450 ℃ in Ar and the consecutive anodic polarization curves of QSn7-0.2 (b) (the scan rate was 5 mV/s)

Fig.3 Macro photo of QSn7-0.2 electrode before and after anodic polarization (a), optical micrograph (b) and XRD pattern (c) of QSn7-0.2 electrode after anodic polarization in molten Li₂CO₃-Na₂CO₃-K₂CO₃ at 450 ℃ in Ar

Fig.4 Macro photo (a) and XRD pattern (b) of the reduction products on the counter electrode during the anodic polarization of QSn7-0.2 electrode in molten Li₂CO₃-Na₂CO₃-K₂CO₃ at 450 ℃ in Ar

Fig.5 Potentiostatic electrolysis curve of QSn7-0.2 electrode at a constant potential of 0.2 V for 20 h (a) and its anodic polarization curves before and after potentiostatic electrolysis in molten Li₂CO₃-Na₂CO₃-K₂CO₃ at 450 ℃ in Ar (b)

Fig.6 Macro photo of QSn7-0.2 electrode before and after potentiostatic electrolysis (a), optical micrograph (b) and XRD pattern (c) of QSn7-0.2 electrode after polarization for 20 h at 0.2 V in molten Li₂CO₃-Na₂CO₃-K₂CO₃ at 450 ℃ in Ar

Fig.7 OCP evolution curves of T2 and QSn7-0.2 electrodes during immersion in molten carbonates for 170 h at 450 ℃ in air (a) and anodic polarization cu-rves of the QSn7-0.2 before and after immersion in molten Li₂CO₃-Na₂CO₃-K₂CO₃ at 450 ℃ in Ar (the scan rate was 5 mV/s)

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