Electrochemical Corrosion Behavior of Copper Clad Laminate in NaCl Solution

Comparing with pure copper, the corrosion behavior of copper clad laminate (CCL) in NaCl solution was studied by using linear polarization, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). It was shown that the CCL had a different corrosion behavior and showed a lower corrosion resistance compared with the pure copper. At low polarization potential, CCL dissolves through the formation of CuCl2-, which may be a determined step in the anodic process. And when the polarization potential increased, a porous film containing CuCl formed on the CCL surface, and the transportation of Cl- in the film became the controlling step in the corrosion process. An inductive loop at low frequency was observed in the EIS measurement, which was attributed to the modulation of CuCl film due to the competition between dissolution and growth processes on CCL surface.