银包覆铁硅铬粉的制备与电磁屏蔽性能研究  

Study on preparation and electromagnetic shielding properties of silver-coated ferrosilicochrome powder

作　　者：武俊智 王文卓 杨欣华 邓乐淳 陈强[1] WU Junzhi;WANG Wenzhuo;YANG Xinhua;DENG Lechun;CHEN Qiang(School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;China Ship Development and Design Center,Wuhan 430064,China)

机构地区：[1]西北工业大学材料学院,陕西西安710072 [2]中国舰船研究设计中心,湖北武汉430064

出　　处：《中国舰船研究》2024年第2期173-180,共8页Chinese Journal of Ship Research

基　　金：基础加强计划重点项目(2021-JCJQ-ZD-046-00);陕西省创新能力支撑计划青年科技新星项目(2021KJXX-101);陕西省杰出青年科学基金资助项目(2023-JC-JQ-35)。

摘　　要：[目的]针对海洋环境下电子设备的电磁屏蔽需求,开展高性能电磁屏蔽材料制备及性能研究。[方法]通过扫描电子显微镜、X射线衍射仪、四探针和振动样品磁强计对原始铁硅铬(FeSiCr)粉及银包覆改性后的FeSiCr@Ag的表面形貌、物相组成、电导率和铁磁性能进行分析,采用矢量网络分析仪对样品的S参数进行测试。借助盐雾试验箱模拟涂层在海洋环境下工作的腐蚀行为并对其宏观和微观形貌进行观察,同时使用电化学工作站监测涂层在质量分数为3.5%的氯化纳(NaCl)溶液中的腐蚀行为,并研究其腐蚀机理。[结果]结果表明:随着反应过程中硝酸银(AgNO_(3))添加量的提高,镀银层致密完整。化学镀银后其电导率可达586.79 S/cm,X波段屏蔽效率高达80 dB。在湿热、高盐雾环境加速腐蚀96 h后,FeSiCr@Ag制备的树脂涂层表面无锈蚀现象。化学镀银前后的涂层自腐蚀电位分别为-0.4和-0.09 V,表明镀覆银层后腐蚀介质渗入涂层的速率减慢,缓蚀效果良好。[结论]包覆改性后的FeSiCr@Ag材料具有高效电磁屏蔽性能及良好的耐腐蚀性。[Objective]This study focuses on the preparation and properties of high-performance electromagnetic shielding materials for electronic equipment in marine environments.[Methods]The surface morphology,phase composition,electrical conductivity and ferromagnetic properties of the original ferrosilicochrome powder(FeSiCr)and silver-coated powder(FeSiCr@Ag)are analyzed with a scanning electron microscope,X-ray diffractometer,four probes and vibrating sample magnetometer,and a vector network analyzer is used to test the S parameters of the samples.A salt spray test chamber is used to simulate the corrosion behavior of the coating under marine environment conditions and observe its macro and micro morphology.Meanwhile,an electrochemical workstation is used to monitor the corrosion behavior of the coating in a mass fraction of 3.5%NaCl solution and study its corrosion mechanism.[Results]The results show that the silver plating layer is compact and complete with the increase of the silver nitrate(AgNO_(3))addition.After electroless silver plating,the conductivity can reach 586.79 S/cm and the X-band shielding efficiency reaches 80 dB.After 96 h of accelerated corrosion in a humid heat and high salt spray environment,the surface of the resin coating prepared by FeSiCr@Ag shows no corrosion phenomenon.The self-corrosion potential of the coating before and after electroless silver plating is−0.4 V and−0.09 V respectively,indicating that the penetration rate of the corrosive medium into the coating slows down after silver plating,and a good corrosion inhibition effect is achieved.[Conclusions]The modified FeSiCr@Ag material has highly efficient electromagnetic shielding performance and good corrosion resistance properties.

关 键 词：铁硅铬 电磁屏蔽 耐腐蚀 包覆改性 

分 类 号：U668.1[交通运输工程—船舶及航道工程] TB332[交通运输工程—船舶与海洋工程]