铝基碳化硅复合材料表面镀金前处理工艺探讨

Study on Pre-Treatment Processes for Gold Plating on Surface of Al-SiC Composite Materials

为在铝基碳化硅复合材料表面制备结合力和可焊性良好的金镀层,通过对前处理和材料表面金属化工艺探索试验,确定了在洁净的活化基材表面直接采用敏化和活化来实现铝基碳化硅材料表面异种元素自催化中心原子的均一性,再以硫酸镍体系进行化学镍沉积,最后通过电镀金在基材表面形成均匀、致密的镀金层。采用扫描电子显微镜对镀层截面和表面形貌进行分析,结果表明镀金层表面颜色均匀,镀层厚度均匀连续且结合力良好,说明了该工艺方法的可行性和合理性,对后续铝基碳化硅镀金生产具有较强的指导意义。

To prepare a gold plating layer with good bonding strength and weldability on the surface of Al-SiC composite materials, experiments exploring pre-treatment and surface metallization processes of materials were conducted. It was determined that using sensitization and activation directly on a clean, activated surface of substrate could achieve uniformity of heteroatomic autocatalytic center atoms on the surface of Al-SiC materials. Subsequent chemical nickel deposition was performed using a nickel sulfate system, followed by electroplating gold to form a uniform and dense gold plating layer on the substrate surface. The coating's cross-section and surface morphology were analyzed using scanning electron microscopy(SEM). Results showed that the surface of the gold layer was uniformly colored, with uniform, continuous thickness and good bonding strength, demonstrating the feasibility and rationality of this process method. This study had significant implications for guiding subsequent gold plating production on Al-SiC materials.