The influence of conditions of C3W3C3-implanted H13 steel on corrosion resistance was studied using multi-sweep cyclic voltammetry. The structure and formation conditions of phases in corrosion resistance and effects on corrosion resistance were researched. A super-saturated solid solution of W and C atoms was formed in C3W3C3-implanted steel; the phases of Fe 2W
WC and FeW 3C were obtained in the implanted surface of steel. A passivation layer was formed. Because the multi-implantation possessed both advantage of W and C single implantation in corrosion resistance
so that the implantation is better than single and dual-implantation. The corrosion resistance of the multi-implantation was enhanced following increase of ion dose. After corrosion for 50 voltage sweeps
the J p of C3W3C3 and C3W3 decreased 60% and 47% comparing to H13 steel respectively. The J p of C3W3C3 decreased 34% comparing to C3W3. It is found from SEM observation that after corrosion the passivation layer still existed.