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首页> 外文期刊>Journal of Materials Engineering and Performance >Performance of high-velocity oxyfuel-sprayed coatings on an Fe-based superalloy in Na2SO4-60%V2O5 environment at 900 °C part II: Hot corrosion behavior of the coatings
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Performance of high-velocity oxyfuel-sprayed coatings on an Fe-based superalloy in Na2SO4-60%V2O5 environment at 900 °C part II: Hot corrosion behavior of the coatings

机译：Na2 SO4 -60％V2 O5 环境中Fe基高温合金上高速含氧燃料喷涂涂层的性能在900°C下第二部分：热腐蚀行为涂料的

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摘要

NiCrBSi, Cr3C2-NiCr, Ni-20Cr, and Stellite-6 coatings were deposited on an Fe-based superalloy by the high-velocity oxyfuel (HVOF) thermal spray process. The hot corrosion behavior of the coatings in an aggressive environment of Na2SO4-60%V2O5 at 900 °C under cyclic conditions was studied. The thermogravimetric technique was used to establish the kinetics of corrosion. X-ray diffraction, scanning electron microscopy/energy-dispersive x-ray and electron probe microanalysis techniques were used to analyze the corrosion products. Hot corrosion resistances of all the coatings were found to be better than the uncoated superalloy. The Ni-20Cr coating was found to be the most protective, followed by Cr3C2-NiCr coatings. The Ni-20Cr coating had reduced the mass gain by 90% of that gained by the uncoated superalloy. The hot corrosion resistance shown by the Cr3C2-NiCr coating was slightly better compared with the NiCrBSi coating; however, both of the coatings performed better than the Stellite-6 coating. The Stellite-6 coating was the least effective among the coatings studied, but it was still successful in decreasing the mass gain to about one fourth compared with the uncoated superalloy. The formation of oxides and spinels of nickel, chromium, or cobalt may be contributing to the development of hot corrosion resistance in the coatings. This article focuses on the hot corrosion behavior of HVOF coatings. The characterization of these coatings has been presented in part I included in this issue.
机译：NiCrBSi，Cr3 C2 -NiCr，Ni-20Cr和Stellite-6涂层通过高速氧燃料（HVOF）热喷涂工艺沉积在铁基高温合金上。在循环条件下，研究了Na2SO4 -60％V2 O5 O5腐蚀环境中涂层的热腐蚀行为。使用热重技术来建立腐蚀动力学。用X射线衍射，扫描电子显微镜/能量分散X射线和电子探针显微分析技术分析腐蚀产物。发现所有涂层的抗热腐蚀性能均优于未涂层的高温合金。发现Ni-20Cr涂层最具保护性，其次是Cr3 C2 -NiCr涂层。 Ni-20Cr涂层使质量增加量减少了未经涂层的超合金获得的质量增加量的90％。 Cr3 C2 -NiCr涂层表现出的耐热腐蚀性能比NiCrBSi涂层稍好。但是，两种涂层的性能均优于Stellite-6涂层。在所研究的涂层中，Stellite-6涂层的效果最差，但与未涂层的超合金相比，它仍能成功地将质量增加降低至约四分之一。镍，铬或钴的氧化物和尖晶石的形成可能有助于涂层中抗热腐蚀的发展。本文重点介绍HVOF涂层的热腐蚀行为。这些涂料的特性已在本期第一部分中介绍过。

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