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Influence of Cr content on high-temperature oxidation behaviour of arc sprayed Ni-Cr coatings

机译：Cr含量对电弧喷涂Ni-Cr涂层高温氧化行为的影响

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摘要

In this study, the high-temperature oxidation behaviour of arc-sprayed Ni-Cr coatings with high Cr contents of 30, 45 and 50 at.% was investigated in comparison with reference AISI 1020 steel. X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy were utilised to characterise the oxide scales. The oxidation resistance of the steel substrates was found to be enhanced after the application of the Ni-Cr coatings since the oxidation kinetics followed the parabolic law. In addition, the oxidation rate of Ni-50Cr coating was 56.5% lower than that of Ni-30Cr coating, indicating that the oxidation performance of coatings was improved with increasing Cr content. The oxide layers of Ni-Cr coating were found to be a double layer structure protecting the substrate from severely oxidation, which composed of a top layer of NiO and a basal layer of Cr2O3 and NiCr2O4. The surface of Ni-30Cr coating contained lots of multi-angle NiO crystals, while the surface of Ni-50Cr coating contained a dense Cr2O3 structure, suggesting that the growth of NiO crystals was limited due to the large amount of Cr-rich oxides.
机译：在该研究中，与参考AISI 1020钢相比，研究了高Cr含量为30,45和50的高Cr含量的电弧喷涂的Ni-Cr涂层的高温氧化行为。 X射线衍射，扫描电子显微镜和能量分散光谱被用来表征氧化物鳞片。发现钢基材的氧化耐氧化抗性在施用Ni-Cr涂层之后被增强，因为氧化动力学跟随抛物线法。此外，Ni-50cr涂层的氧化速率低于Ni-30cr涂层的氧化速率56.5％，表明Cr含量增加，提高了涂层的氧化性能。发现Ni-Cr涂层的氧化物层是保护基材免受严重氧化的双层结构，其由NiO顶层和Cr2O3和NiCr2O4的基底层构成。 Ni-30CR涂层的表面含有大量的多角度NiO晶体，而Ni-50CR涂层的表面含有致密Cr2O3结构，表明由于大量的Cr富氧化物，NiO晶体的生长受限。

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