Oxidation behavior and electrical property of ferritic stainless steel interconnects with a Cr-La alloying layer by high-energy micro-arc alloying process
Oxidation behavior and electrical property of ferritic stainless steel interconnects with a Cr-La alloying layer by high-energy micro-arc alloying process
复制标题
高能微弧合金化Cr-La合金层铁素体不锈钢互连体的氧化行为和电学性能
DOI：
10.1016/j.jpowsour.2010.06.016
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发表时间：
2010-11
影响因子：
9.2
通讯作者：
Feng, Z. J.
中科院分区：
文献类型：
--
作者：
Zeng, C. L.;Feng, Z. J.
铬的挥发性，中毒的阴极材料和迅速降低的电导率是主要的问题与铁素体不锈钢连接的固体氧化物燃料电池的应用在中间温度下运行。最近，提出了一种新的和简单的高能微弧合金化（HEMAA）工艺制备LaCrO 3基涂层的430型不锈钢互连使用LaCrO 3-Ni棒作为沉积电极。首先以Cr和La为沉积电极，采用HEMAA法在合金表面获得Cr-La合金化层，然后在850°C空气中进行氧化处理，形成热生长LaCrO 3涂层。由于形成了一层由LaCrO 3外层和少量富Cr氧化物组成的保护膜和一层薄的富Cr2 O3亚层，涂层钢的氧化速率显著降低。采用LaCrO 3基涂层可获得低而稳定的接触电阻，在850°C空气中暴露500 h后，接触电阻值小于40 m Ω cm 2。
Chromium volatility, poisoning of the cathode material and rapidly decreasing electrical conductivity are the major problems associated with the application of ferritic stainless steel interconnects of solid oxide fuel cells operated at intermediate temperatures. Recently, a novel and simple high-energy micro-arc alloying (HEMAA) process is proposed to prepare LaCrO3-based coatings for the type 430 stainless steel interconnects using a LaCrO3–Ni rod as deposition electrode. In this work, a Cr–La alloying layer is firstly obtained on the alloy surface by HEMAA using Cr and La as deposition electrode, respectively, followed by oxidation treatment at 850°C in air to form a thermally grown LaCrO3coating. With the formation of a protective scale composed of a thick LaCrO3outer layer incorporated with small amounts of Cr-rich oxides and a thin Cr2O3-rich sub-layer, the oxidation rate of the coated steel is reduced remarkably. A low and stable electrical contact resistance is achieved with the application of LaCrO3-based coatings, with a value less than 40mΩcm2during exposure at 850°C in air for up to 500h.
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影响因子：
3.2
作者：
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通讯作者：
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