The present study aims to develop composite (amorphous + nanocrystalline) coating using blast furnace (BF) pig iron composition with the help of atmospheric plasma spray process for the first time. The usage of cheap and lean chemical composition of pig iron for the development of economical composite coating on mild steel substrate has led to the improvement in its hardness as well as corrosion resistance in 3.5% NaCl solution. The corrosion resistance of the BF metal composite coating in 3.5% NaCl solution has rivaled that of the heavily alloyed (like Cr, Ni and Mo) 316L stainless steel coating. The as-sprayed coating has been characterized using x-ray diffraction, scanning electron microscope and transmission electron microscope. The improvement in corrosion resistance of composite coating can be attributed to the presence of amorphous, nanocrystalline phase and higher content of P and Si and protective rust phases.

中文翻译：

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高炉生铁组成的常压等离子喷涂非晶/纳米晶复合涂层及其电化学响应

本研究旨在首次利用高炉（BF）生铁成分在大气等离子喷涂工艺的帮助下开发复合（非晶+纳米晶）涂层。使用廉价且贫化的生铁化学成分在低碳钢基材上开发经济的复合涂层，提高了其硬度以及在 3.5% NaCl 溶液中的耐腐蚀性。BF 金属复合涂层在 3.5% NaCl 溶液中的耐腐蚀性能与重合金（如 Cr、Ni 和 Mo）316L 不锈钢涂层相媲美。使用 X 射线衍射、扫描电子显微镜和透射电子显微镜对喷涂后的涂层进行了表征。复合涂层耐腐蚀性的提高可归因于非晶态的存在，