过渡层对钕铁硼表面蒸发镀铝涂层耐腐蚀性能的影响

发布时间：2018-12-27 18:42

【摘要】：目的提高钕铁硼磁体表面Al防护涂层的结合强度及耐腐蚀性能。方法通过磁控溅射在钕铁硼磁体表面沉积Al过渡层,用高偏压进行轰击后,使用离子辅助蒸发镀技术沉积Al防护涂层。用扫描电子显微镜观察涂层表面及截面形貌,电化学工作站及盐雾试验检测涂层腐蚀性能,拉伸试验评价涂层与基体结合强度。结果随着磁控溅射靶电流从10 A提高到25 A,所制备的Al层自腐蚀电压从-0.7367 V递减到-0.9075 V,耐中性盐雾腐蚀性能下降。在用相同工艺制备表面离子辅助蒸发镀Al防护涂层的前提下,磁控溅射靶电流为25 A时制备的100 nm和500 nm过渡层的防护涂层耐盐雾腐蚀时间分别为48 h和36 h,耐腐蚀性能不如无过渡层的纯蒸发镀铝涂层(72 h);磁控溅射靶电流为15 A制备的100 nm和500 nm过渡层的防护涂层耐盐雾腐蚀时间分别为96 h和103 h,其耐腐蚀性能优于无过渡层的纯蒸发镀铝涂层。采用过渡层技术的Al防护涂层结合强度均大于40 MPa,与钕铁硼基体结合良好。结论过渡层技术均可使Al涂层与Nd Fe B基体结合良好,合适的过渡层工艺可提高离子辅助蒸发镀铝涂层的耐腐蚀性能。
[Abstract]:Objective to improve the bonding strength and corrosion resistance of Al protective coatings on NdFeB magnets. Methods the Al transition layer was deposited on the surface of NdFeB magnets by magnetron sputtering. After bombarded with high bias voltage, the Al protective coating was deposited by ion-assisted evaporation plating. The surface and cross section morphology of the coating was observed by scanning electron microscope (SEM), the corrosion resistance of the coating was examined by electrochemical workstation and salt spray test, and the bonding strength between the coating and the substrate was evaluated by tensile test. Results with the increase of the target current from 10 A to 25 A, the self-corrosion voltage of the prepared Al layer decreased from-0.7367 V to-0.9075 V, and the corrosion resistance to neutral salt spray decreased. On the premise of preparing the surface ion-assisted evaporative plating Al protective coating with the same process, the corrosion resistance time of the 100 nm and 500 nm transition layer prepared by magnetron sputtering target current 25 A is 48 h and 36 h, respectively. Corrosion resistance of pure evaporative aluminum coating without transition layer (72 h);) The corrosion resistance time of 100 nm and 500 nm transition layers prepared by magnetron sputtering target current of 15 A is 96 h and 10 3 h, respectively. The corrosion resistance of the coating is better than that of pure evaporative aluminum coating without transition layer. The bonding strength of Al protective coating with transition layer technology is more than 40 MPa, and the bonding strength of NdFeB substrate is good. Conclusion the technology of transition layer can make the Al coating bind well to the Nd Fe B substrate, and the proper interlayer process can improve the corrosion resistance of the ion-assisted evaporative aluminum coating.
【作者单位】：广东省新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室;
【基金】：广东省科技计划项目(2013B090500115) 广东省科学院平台建设项目(2016GDASPT-0206,2016GDASPT-0317)~~
【分类号】：TG174.4

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