湿法超声机械镀锌技术研究

Research of Ultrasonic-based Wet Mechanical Plating

目的改进滚筒式机械镀锌设备对零件尺寸的限制,实现较大尺寸零件的机械镀锌。方法提出一种新的机械镀锌工艺,即用超声振动系统为冲击介质提供动力,冲击锌粉颗粒到工件表面,形成镀锌层。观察镀锌层的微观表面形貌和断面形貌,测试镀锌层的结合强度,利用中性盐雾试验评判镀锌层的耐腐蚀性能。结果在工件表面获得了一定厚度的镀锌层,镀层表面细腻、均匀、平整,无凹凸不平结构。镀层是由锌粉颗粒镶嵌、填充而成的致密堆积体,与基体的结合强度高,耐腐蚀性能好。结论湿法超声机械镀锌工艺可以对较大尺寸零件进行机械镀锌。

Objective To improve the restriction of Rotary Mechanical Plating equipment on the size of parts and achieve zinc coatings for larger parts. Methods A novel method for Mechanical Plating was presented using ultrasonic vibrations to provide mo tives for impact media to realize zinc coating on metallic surfaces. The surface topography and section morphology of the coating were observed. The bonding strength between the coating and the substrate was tested. The corrosion resistance of the coating was evaluated by the salt spray test. Results The new process had good performance in zinc plating and a certain thickness of zinc coating could be obtained. The finish of zinccoating gained by new process was fine, uniform and smooth, and the whole surface of the coating was flat without uneven structure. The coating was fabricated by zinc powders. The bonding strength between the coat ing and substrate was high and the corrosion resistance of the coating was good. Conclusion Zinc coatings could be obtained for lar ger parts by the Wet Mechanical Plating process.