SUS430合金表面Co3O4 和La0.6Sr0.4CoO3-δ双层涂层的制备及性能研究

doi:10.15541/jim20140377

摘要/Abstract

摘要：

采用电镀法在SUS430合金表面镀钴作为阻挡层, 然后通过丝网印刷和高温烧结在钴镀层表面制备La_0.6Sr_0.4CoO_3-_δ接触层。为提高接触层的低温烧结效果, 添加了适量的 Co₃O₄作为烧结助剂。经热处理, 合金试样表面最终形成Co₃O₄和La_0.6Sr_0.4CoO_3-_δ双层涂层。利用XRD、SEM 和EDS 对涂层的物相、微观形貌和元素扩散进行了分析, 结果表明所制得的双层涂层均致密平整, 涂层之间及涂层与基体之间结合紧密, 阻挡层有效地限制了合金表面氧化膜的生长和Cr的往外扩散, 并用直流四端子法测得金属连接体在800℃下连续氧化200 h后的表面比电阻为23 mΩ·cm²。双层涂层有效地改善了SUS430合金的高温抗氧化性能和电学性能。

关键词: 固体氧化物燃料电池, 金属连接体, 钴镀层, 双层涂层

Abstract:

The cobalt for protective layer on SUS430 steel was firstly deposited by electroplating, and La_0.6Sr_0.4CoO_3-_δ for cathode contact layer was then prepared by screen printing. Co₃O₄was used as sintering additives to improve sintering behavior of the contact layer. Dual layer coatings Co₃O₄and La_0.6Sr_0.4CoO_3-_δ were formed by subsequent oxidation at 800℃ in air. The phases, morphology and element diffusion of the dual layer coatings were analyzed by XRD, SEM and EDS. The results show that the dual layer coatings achieve good bonding and adhesion, and effectively block chromium diffusion. The interconnect with dual layer coatings exhibits a low ASR value of 23 mΩ·cm² after isothermal oxidation at 800℃ for 200 h. The dual layer coatings effectively improve the oxidation resistance and electrical properties of SUS430 steel substrate.

Key words: solid oxide fuel cell, metallic interconnect, cobalt layer, dual layer coatings

中图分类号:

TQ174

杨晓龙, 屠恒勇, 余晴春. SUS430合金表面Co₃O₄和La_0.6Sr_0.4CoO_3-δ双层涂层的制备及性能研究[J]. 无机材料学报, 2015, 30(4): 379-384.

YANG Xiao-Long, TU Heng-Yong, YU Qing-Chun. Fabrication and Property of Co₃O₄ and La_0.6Sr_0.4CoO_3-_δ Dual Layer
Coatings on SUS430 Steel[J]. Journal of Inorganic Materials, 2015, 30(4): 379-384.

图/表 8

表1 钴镀液的化学组成

Table 1 Electroplating parameters for the cobalt coating on SUS430 substrates

Bath composition	Concentration/(g·L^-1)
CoSO₄·7 H₂O	278
CoCl₂·6 H₂O	36
H₃BO₃	45
Sodium dodecyl sulfate	0.2
Saccharin sodium	1.65
De-ionised water	Balance

图1 测量试样表面比电阻的结构示意图

Fig. 1 Schematic representation of specimen for area-specific resistance (ASR) measurement

图2 GNP法合成的LSC粉体的XRD图谱(a)和表面有双层涂层保护的基板在800 ℃下氧化200 h后表面的XRD谱图(b)

Fig. 2 XRD patterns of synthesized LSC powder by GNP (a) and XRD patterns (b) of dual layer coated surfaces after oxidation at 800 ℃ in air for 200 h

图3 SUS430基体表面钴镀层的SEM照片

Fig. 3 SEM micrograph of electrodeposited cobalt coating on SUS430 steel

图4 SUS430基体表面钴镀层氧化不同时间的表面SEM照片

Fig. 4 SEM images of the cobalt coatings on SUS430 substrate after oxidation at 800℃ in air for different time (a) 2 h; (b) 10 h; (c) 100 h

图5 SUS430基体表面LSC接触层的表面SEM照片

Fig. 5 SEM images of LSC contact layer coated on SUS430 substrate

图6 SUS430合金双层涂层截面的SEM照片(a)和EDS元素 (b)Cr, (c)Co, (d)Fe, (e)O, (f)La, (g)Sr分析结果

Fig. 6 SEM image (a) and EDS analysis of (b) Cr, (c) Co, (d) Fe, (e) O, (f) La and (g) Sr in cross-section of dual layer coated SUS430 substrate

图 7 表面有双层涂层保护的基板的ASR随氧化时间变化

Fig. 7 ASR values for dual layer coated substrate as a function of oxidation time

参考文献 16

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SUS430合金表面Co₃O₄和La_0.6Sr_0.4CoO_3-δ双层涂层的制备及性能研究

Fabrication and Property of Co₃O₄ and La_0.6Sr_0.4CoO_3-_δ Dual Layer
Coatings on SUS430 Steel

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