火焰重熔对 HVOF 喷涂的 NiCrBSi 涂层的微观结构、耐磨性和耐腐蚀性的影响

Cheng Wei Liu, En Wei Qin, Guo Xing Chen, Shao Chong Wei, Yang Zou, Lin Ye, Shu Hui Wu
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摘要

作为一种后处理方法,热重熔是消除孔隙和建立热喷涂涂层冶金结合的有效方法。然而,要同时获得高耐腐蚀性和高耐磨性却相当困难,因为额外的能量输入通常会导致涂层的微观结构更加均匀,从而降低机械硬度。在这项工作中,对高速氧气燃料喷涂的自流镍铬BSi 涂层进行了火焰重熔。重熔对微观结构的影响主要体现在孔隙率和相分析上。比较了基体钢、喷涂后和重熔后涂层的显微硬度、耐磨性和腐蚀性。结果表明,经过重熔后,喷涂涂层中的片状边界和内部缺陷已被消除。涂层孔隙率从 7.36% 大幅降至 0.75%,并且在涂层/基底界面形成了冶金结合。与喷涂涂层相比,重熔涂层的显微硬度提高了约 21%,磨损失重降低了约 42%。通过火焰重熔,磨损机理从沟槽磨损和磨料磨损转变为微切削和局部断裂。通过盐雾和电位测试,重熔涂层还表现出更好的耐腐蚀性。
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Effect of Flame Remelting on the Microstructure, Wear and Corrosion Resistance of HVOF Sprayed NiCrBSi Coatings
As a post treatment, thermal remelting is an effective method to eliminate pores and establish a metallurgical bonding for thermal sprayed coatings. However, it is rather difficult to obtain simultaneously high corrosion and wear resistance, since additional energy input usually leads to more homogeneous microstructure in coatings, which deteriorates mechanical hardness. In this work, flame remelting has been imposed to high velocity oxygen-fuel sprayed self-flux NiCrBSi coatings. The remelting effects on microstructure were characterized in terms of porosity and phase analysis. The microhardness, wear resistance and corrosive behaviors were compared among substrate steel, as-sprayed and as-remelted coatings. Results show that the lamellar boundaries and internal defects in the as-sprayed coatings have been eliminated by remelting. The coating porosity has substantially reduced from 7.36% to 0.75%, and a metallurgical bonding at the coating/substrate interface has been formed. Comparing with the as-sprayed coatings, the microhardness of the remelted coatings increases about 21% and the wear weight loss reduces about 42%. By flame remelting, the wear mechanism changes from furrow and abrasive wear to micro-cutting and local fracture. The remelted coatings have also exhibited better corrosion resistance by means of salt spraying and potentiodynamic tests.
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