High Temperature Corrosion in Water Vapor of Fe–2.25Cr–0.54Mo Coated with Ni-Based Alloy Containing WC–Co Using an HVOF Spraying Technique

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-02-09 DOI:10.1007/s11085-024-10224-3

Jennarong Tungtrongpairoj, Penpisuth Thongyoug, Thanasak Nilsonthi, Somrerk Chandra-ambhorn

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Abstract

The high temperature corrosion of Fe-2.25Cr-0.54Mo steel coated with WC–Co/NiCrFeSiB using a high-velocity oxy-fuel spraying technique was investigated. Coated and uncoated steel samples were tested in air and in a humidified atmosphere consisting of N₂-50%, O₂-10%, and H₂O at 750 °C for 120 h. Microstructural and phase analyses of the studied samples were performed by scanning electron microscopy equipped with energy-dispersive spectroscopy and X-ray diffraction. When compared to oxidation in air, the oxidation rate of the uncoated sample in the humidified atmosphere was faster. This occurred because there was a thicker and denser iron oxide layer at the outer subscale, and the thicker layer of inner iron oxide subscale contained chromium (Cr). Moreover, the WC–Co/NiCrFeSiB coating greatly suppressed the rates of oxidation in both the air and the humidified oxygen atmospheres. This occurred because the formation of magnetite (Fe₃O₄) was suppressed, while the protective oxides, especially nickel–chromium (Ni–Cr) spinel and chromia (Cr₂O₃) were formed during oxidation. Water vapor in the atmosphere enhanced the oxidation rate of the coated steel, with higher iron-containing oxide forming as a subscale at the outer coating.

Graphic Abstract

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使用 HVOF 喷射技术在含 WC-Co 的镍基合金上喷涂 Fe-2.25Cr-0.54Mo 的水蒸气中进行高温腐蚀

研究人员采用高速纯氧喷涂技术研究了涂有 WC-Co/NiCrFeSiB 涂层的 Fe-2.25Cr-0.54Mo 钢的高温腐蚀情况。涂层和未涂层钢材样品分别在空气中和由 N2-50%、O2-10% 和 H2O 组成的湿润气氛中进行了 750 °C 120 小时的测试。与在空气中氧化相比，未涂层样品在加湿气氛中的氧化速度更快。这是因为外层的氧化铁层较厚且密度较大，而内层较厚的氧化铁层中含有铬（Cr）。此外，WC-Co/NiCrFeSiB 涂层大大抑制了空气和加湿氧气环境中的氧化速度。这是因为磁铁矿（Fe3O4）的形成受到抑制，而保护性氧化物，尤其是镍铬尖晶石和铬铁矿（Cr2O3）在氧化过程中形成。大气中的水蒸气提高了涂层钢的氧化速度，在外层形成了较高的含铁氧化物子鳞片。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.