以微蚀液稳定性、微蚀速率、微蚀后的亮度和粗糙度为考量,通过实验分析,确定了高密度线路板微蚀液中主要组分硫酸和双氧水,以及清洗剂、光亮剂、有机溶剂、稳定剂的用量,获得了一种新型微蚀液,并确定了微蚀温度。用该微蚀液对线路板进行处理,可以获得光亮、粗糙的表面,从而使线路板表面与干膜的贴合力提高;此外,该微蚀液的微蚀速率高,稳定可控,能适应高密度线路板的规模化生产。

A new microetchant and formulation for high density printed circuit board were developed. Based on the stability, etching rate of the microetchant, the surface brightness and roughness after etching, the microetchant was mainly consist of sulfuric acid and hydrogen peroxide. The amount of cleaning agents, brighteners, organic solvents, stabilizers and the reaction temperature were also determined. It can make the surface of the circuit board bright and rough. The affinity of metal surface and dry film can be improved. The rate of etching was high, stable and controlled and it can be used on PCB large scale production.