Microstructural Charactistics of Plasma Sprayed NiCrBSi Coatings and Their Wear and Corrosion Behaviors

Huang Songqiang, Jingzhong Zhou, Sun Kuoteng, Hailiang Yang, Cai Weichen, Yi Liu, P. Zhou, Shuangjie Wu, Hua Li
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引用次数: 10

Abstract

Nickel-based alloys are commonly used as protective coating materials for surface protection applications owing to their superior resistance to corrosion, wear and high-temperature oxidation. It is urgent to study the fundamental mechanism between the structure and corrosion properties of the Nickel-base composite coatings. This paper, therefore, focuses on clarifying the mechanisms of the microstructure influencing the acid corrosion and mechanical characteristics of the as-sprayed NiCrBSi coating and post-heat-treated coating. The formation mechanisms of the amorphous phase of flat particles during the plasma spray process were studied by using X-ray diffraction analysis, Raman spectroscopy and confocal laser scanning microscope at first. Then the evolutionary process of the corrosion structure and phase of the coating in the accelerated corrosion experiment is directly visualized by using scanning electron microscopy and energy spectrum analysis. The mechanical properties of the amorphous NiCrBSi coatings are lastly measured by microhardness and friction wear tests. The critical phenomena and results help to elucidate the relative influence of the surface features of atmospheric plasma sprayed coatings on acid corrosion responses and wear resistance, aiming at contributing to the development of a protective technique for electrical engineering.
等离子喷涂NiCrBSi涂层的组织特性及其磨损和腐蚀行为
由于镍基合金具有优异的耐腐蚀、耐磨损和耐高温氧化性能,因此通常用作表面保护涂层材料。研究镍基复合镀层的结构与腐蚀性能之间的基本机理是当务之急。因此,本文的重点是澄清微观组织影响喷态NiCrBSi涂层和热处理后涂层的酸蚀和力学特性的机理。首先利用x射线衍射分析、拉曼光谱和激光共聚焦扫描显微镜对等离子体喷射过程中扁平颗粒非晶相的形成机理进行了研究。然后利用扫描电镜和能谱分析直接可视化了涂层在加速腐蚀实验中腐蚀结构和相的演化过程。最后通过显微硬度和摩擦磨损试验测定了非晶NiCrBSi涂层的力学性能。这些关键现象和结果有助于阐明大气等离子喷涂涂层表面特征对酸腐蚀响应和耐磨性的相对影响,旨在促进电气工程防护技术的发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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