高速火焰喷涂VC-CuNiCr涂层的耐腐蚀性能  

Corrosion behavior of as-sprayed VC-CuNiCr based coatings developed by high-velocity oxygen fuel process

作　　者：SINGH Vikrant BANSAL Anuj SINGLA Anil Kumar KUMAR Vijay 

机构地区：[1]Sant Longowal Institute of Engineering and Technology Longowal,Sangrur 148106,India [2]Industrial and Production Engineering Department,Dr B R Ambedkar National Institute of Technology,Jalandhar 144011,India

出　　处：《Journal of Central South University》2024年第5期1385-1397,共13页中南大学学报（英文版）

摘　　要：本研究采用高速火焰喷涂(HVOF)沉积技术,将碳化钒(VC)和铜镍铬(CuNiCr)复合涂层应用于SS316不锈钢上,以解决不锈钢在海洋环境中的腐蚀问题。在室温环境下,在3.5%氯化钠溶液中进行电化学腐蚀,通过扫描电子显微镜(SEM)和能量色散光谱(EDS)对有涂层和未覆涂层样品的表面形貌进行检测。结果表明,涂层内由铜(Cu)、镍(Ni)和铬(Cr)组成的金属间黏合剂在氯化钠介质的影响下发生变质,从而导致出现衬底间的局部点蚀现象。有趣的是,在涂层配方中加入碳化钒(VC)显著地增强了表面的耐腐蚀性能,从而阻止了密闭腐蚀凹坑的出现。在不同类的涂层中,加入VC的效果最好,最小的腐蚀速率为72.38×10^(-3)mm/a,相比之下,SS316基底的腐蚀速率最快。In this investigation,the high-velocity oxygen fuel(HVOF)deposition technique was implemented to administer vanadium carbide(VC)and cupronickel-chromium(CuNiCr)composite coatings onto SS316 stainless steel.The significance of this research lies in its direct relevance to addressing corrosion-related challenges in marine environments.Preceding and subsequent to the execution of electrochemical corrosion examinations within a 3.5%sodium chloride(NaCl)medium at ambient temperature,a comprehensive scrutiny of the surface topographies of both the coated and uncoated specimens was conducted through scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The outcomes manifest that the intermetallic binder composed of copper(Cu),nickel(Ni),and chromium(Cr)within the coatings undergoes deterioration under the influence of the NaCl medium,thereby inducing localized pitting corrosion phenomena across the substrate.Intriguingly,the incorporation of VC within the coating formulation conspicuously amplifies the corrosion resistance attributes of the treated surface,thereby ameliorating the occurrence of confined corrosive pits.Amidst the assortment of coatings subjected to scrutiny,the VC imbued surface attains the most favorable outcome,showcasing minimal corrosion rate of 72.38×10^(-3)mm/a.In contrast,the SS316 base substrate exhibits the most escalated corrosion rate calculated at 783.82×10^(-3)mm/a.

关 键 词：高速火焰喷涂 碳化钒 铜镍铬 电化学腐蚀 氯化钠溶液 

分 类 号：TG174.4[金属学及工艺—金属表面处理]