Effects of minor alloying elements (Si, Mn and Al) on the corrosion behavior of stainless steels in molten carbonate fuel cell cathode environment

IF 2.7 4区材料科学 Q3 ELECTROCHEMISTRY

Corrosion Reviews Pub Date : 2023-11-13 DOI:10.1515/corrrev-2022-0096

SooHoon Ahn, MinJoong Kim, YoungJun Kim, JuYoung Youn

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Abstract

Abstract Effects of minor alloying elements (Si, Mn, and Al) on the corrosion resistance behaviors of stainless steel (SS) modified 310S used as a cathode current collector (CCC) material for molten carbonate fuel cells (MCFC) were examined in a mixture of 62 mol% Li 2 CO 3 –38 mol% K 2 CO 3 at 650 °C by measuring the change in corrosion potential and the potentio-dynamic, potentio-static polarization responses. The corrosion potential of modified 310S gradually increased after 9 h of immersion due to an active to passive transition and that of SSs added with minor alloying elements drastically increased before 6 h of immersion due to the reactive alloys. Si, Mn, and Al addition to base SS led to a decrease in corrosion resistance due to the rapid corrosion rate at the cathode operation potential, −40 mV, of the MCFC. The steady state current densities of SSs added with minor alloying elements were higher than that of 310S and modified 310S. Addition of Si, Mn, and Al induced a decrease in corrosion resistance of CCC materials in molten carbonate fuel cell operating temperatures, 650 °C.

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少量合金元素(Si, Mn和Al)对不锈钢在熔融碳酸盐燃料电池阴极环境中腐蚀行为的影响

通过测量腐蚀电位的变化以及动态电位和静态电位的极化响应，研究了少量合金元素(Si、Mn和Al)对作为熔融碳酸盐燃料电池(MCFC)阴极集流材料的不锈钢(SS)改性310S的耐蚀性能的影响。该材料在62mol % li2co3 - 38mol % k2co3混合溶液中，温度为650℃。改性310S的腐蚀电位在浸泡9 h后由于主动向被动转变而逐渐增大，添加少量合金元素的SSs的腐蚀电位在浸泡6 h前由于反应性合金而急剧增大。Si, Mn和Al加入到碱SS中导致MCFC的耐腐蚀性下降，这是由于阴极工作电位(- 40 mV)下MCFC的腐蚀速度很快。添加少量合金元素的SSs稳态电流密度高于310S和改性310S。在熔融碳酸盐燃料电池工作温度为650℃时，添加Si、Mn和Al导致CCC材料的耐腐蚀性下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion Reviews 工程技术-材料科学：膜

CiteScore

5.20

自引率

3.10%

发文量

审稿时长

4.5 months

期刊介绍： Corrosion Reviews is an international bimonthly journal devoted to critical reviews and, to a lesser extent, outstanding original articles that are key to advancing the understanding and application of corrosion science and engineering in the service of society. Papers may be of a theoretical, experimental or practical nature, provided that they make a significant contribution to knowledge in the field.