In September I’ve continued the the voltammetric studies on a copper surfaces, from stable homogeneous Zn(II)-Mo(VI) citrate baths with various concetrations of sodium citrate and sodium molybdate. The voltammetric measurements were performer in a tree-electrode cell , by means of potentiostat PARSTAT 2273 or PGSTAT302N. A copper disc was the working electrode (surface area 2.83 cm2). A platinum sheet (5cm2) was used as the counter electrode. The working electrode potentials were referred to the saturated calomel electrode (SCE) and were ohmic drop, as measured by the current interrupt method, was compensated for.