电泳沉积制备<strong>MnCo</strong>尖晶石涂层的高温长期稳定性研究

doi:10.11902/1005.4537.2023.310

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 972-978 CSTR: 32134.14.1005.4537.2023.310 DOI: 10.11902/1005.4537.2023.310

研究报告

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电泳沉积制备MnCo尖晶石涂层的高温长期稳定性研究

王碧辉, 刘聚, 崔志翔, 肖博, 杨天让, 张乃强(

)

华北电力大学能源动力与机械工程学院北京 102206

Long-term Stability of MnCo Spinel Coatings Prepared by Electrophoretic Deposition at High Temperatures

WANG Bihui, LIU Ju, CUI Zhixiang, XIAO Bo, YANG Tianrang, ZHANG Naiqiang(

)

College of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

引用本文:

王碧辉, 刘聚, 崔志翔, 肖博, 杨天让, 张乃强. 电泳沉积制备MnCo尖晶石涂层的高温长期稳定性研究[J]. 中国腐蚀与防护学报, 2024, 44(4): 972-978.
Bihui WANG, Ju LIU, Zhixiang CUI, Bo XIAO, Tianrang YANG, Naiqiang ZHANG. Long-term Stability of MnCo Spinel Coatings Prepared by Electrophoretic Deposition at High Temperatures[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 972-978.

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摘要:

采用电泳沉积工艺在不同Cr含量钢表面制备了Mn_1.5Co_1.5O₄尖晶石涂层，探究了温度对Mn_1.5Co_1.5O₄/钢体系的长期稳定性和导电性能的影响。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和4线法电阻(ASR)测试对样品进行表征。结果表明，两步烧结法得到了相对致密性的涂层。在800℃氧化1000 h 后，Mn_1.5Co_1.5O₄/钢的氧化速率约为(1~3) × 10^-14 g²·cm^-4·s^-1，随着氧化温度的降低，氧化速率常数下降1~2个数量级。SUS430钢凭借自身较低Cr含量，在Mn_1.5Co_1.5O₄/SUS430样品中形成了更薄的含Cr氧化层。同时，氧化过程中钢中Fe向外扩散促进涂层致密性，最终Mn_1.5Co_1.5O₄/SUS430获得了比Mn_1.5Co_1.5O₄/Crofer22H更低的ASR值。

关键词 ：固体氧化物燃料电池, 铁素体钢, 尖晶石涂层, 电泳沉积

Abstract：

Spinel coatings Mn_1.5Co_1.5O₄ on steels SUS430 and Crofer22H were prepared via electrophoretic deposition, aiming to improve their high-temperature oxidation resistance and electrical conductivity as SOFC interconnector. Afterwards, their oxidation behavior at 700-800^oC and electrical conductivity after oxidation were characterized by means of intermittent weighing method, X-ray diffraction (XRD), scanning electron microscope (SEM) and 4-wire electrical resistance tester (ASR). The result showed that relatively dense coatings may be acquired by two-step sintering. The oxidation rate of Mn_1.5Co_1.5O₄/SUS430 oxidized at 800^oC for 1000 h is about (1-3) × 10^-14 g²·cm^-4·s^-1, and the oxidation rate constant decreases by 1-2 orders of magnitude as the temperature decreases. Mn_1.5Co_1.5O₄/SUS430 formed a thinner Cr-containing oxide scale due to its own low Cr content, at the same time, the Fe diffused outward from the substrate steel during the oxidation process to further promote the coating densification. Ultimately, after high temperature oxidation, the Mn_1.5Co_1.5O₄/SUS430 showed ASR values lower than those of the Mn_1.5Co_1.5O₄/Crofer22H.

Key words： solid oxide fuel cell ferrite steel spinel coating electrophoretic deposition

收稿日期: 2023-09-27 32134.14.1005.4537.2023.310

ZTFLH:

TG172

通讯作者: 张乃强，E-mail：zhnq@ncepu.edu.cn，研究方向为金属高温腐蚀行为

Corresponding author: ZHANG Naiqiang, E-mail: zhnq@ncepu.edu.cn

作者简介: 王碧辉，女，1994年生，博士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.310 或 https://www.jcscp.org/CN/Y2024/V44/I4/972

表1 SUS430钢和Crofer22H钢的标准化学成分 (mass fraction / %)

图1 涂层制备方法示意图以及烧结后表面和截面形貌

图2 Mn1.5Co1.5O4/SUS430和Mn1.5Co1.5O4/Crofer22H两种试样在不同温度下的氧化增重曲线

图3 Mn1.5Co1.5O4/SUS430和Mn1.5Co1.5O4/Crofer22H试样在不同温度下氧化200 h以及1000 h后的表面形貌和XRD谱

图4 Mn1.5Co1.5O4/SUS430和Mn1.5Co1.5O4/Crofer22H两种试样在不同温度下氧化1000 h后的截面形貌及元素分布图(图中黄线标记为含Cr氧化层厚度)

图5 Mn1.5Co1.5O4/钢在800℃氧化200 h以及1000 h后在不同温度下的面比电阻

图6 Mn1.5Co1.5O4/钢试样氧化过程中元素扩散示意图

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