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La0.6Sr0.4CoO3-?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La0.6Sr0.4CoO3-?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 m?·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。
The cobalt for protective layer on SUS430 steel was firstly deposited by electroplating, and La0.6Sr0.4CoO3-?for cathode contact layer was then prepared by screen printing. Co3O4 was used as sintering additives to improve sintering behavior of the contact layer. Dual layer coatings Co3O4 and La0.6Sr0.4CoO3-?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 m?·cm2 after iso-thermal oxidation at 800℃ for 200 h. The dual layer coatings effectively improve the oxidation resistance and electrical properties of SUS430 steel substrate.
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