copper anode;  passivation;  sulfuric acid medium;  Cyclic voltammetry

The electrochemical behavior of copper anode in sulfuric acid medium was studied by potentiodynamic scanning technology, and the effects of different electrolyte concentrations, different holding times, different holding potentials, and the presence of molecular oxygen and Cu2+ in the electrolyte on the cyclic voltammetry curve of copper anode were investigated. The results show that the presence of molecular oxygen and Cu2+ in the electrolyte, a longer holding time and a more positive holding potential can increase the peak current, which is conducive to the passivation of the metal. The passivation film formed in different concentrations of H2SO4 media has two layers, but its composition is different, and the passivation mechanism of copper is further inferred.