PULSE VOLTAMMETRIC TECHNIQUES APPLIED TO THE ANODIZATION OF COPPER MICROELECTRODES

Pulse techniques at microelectrodes have been used to show their utili ty for the investigation of reactions important in corrosion and, spec ifically, to characterize the anodization of copper in ethylene glycol -water mixtures containing chloride. Pulse techniques render accessibl e the entire voltammetric wave and yield values of equilibrium constan ts T or complex formation from transient measurements. The formal valu e of the formation constant for dichlorocuprate(I) in 50% v/v ethylene glycol water is given by log beta(2) = 5.8. At sufficiently high conc entrations of chloride and low current density the reaction product is CuCl2-, whereas in the limiting current region the product is the neu tral monochloro complex.