Fabrication and Property of Co3O4 and La0.6Sr0.4CoO3-δ Dual Layer Coatings on SUS430 Steel

doi:10.15541/jim20140377

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 8

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

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

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

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

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

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

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

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

References 16

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

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