Effect of Pulse Plating Mode on Structure and Physical-Mechanical Properties of Copper Coatings
Pulsing current is one of the ways to get uniform thickness of copper coatings in throughholes of PCB's. Using different operating conditions in order to optimize the characteristic of copper coatings a study of deposits microhardness, ultimate strength, elongation and roughness was made. Experimental technique is described in detail. Results of these tests are given for different current densities and coating thicknesses (Figs.2,3, Table 1). An effect of the length of anodic pulse on the coating roughness was studied and a reduction in the roughness was found at longer pulses (Fig.4, Table 3).