The properties of corrosion resistance for C and W dual-implanted H13 steel were studied using multi-sweep cyclic voltammetry. The corrosion morphologies were investigated by scanning electron microscopy (SEM). The results show that after corrosion for 30 voltage scanning-loops

serious corrosion morphology appears on the surface of H13 steel: dense corrosion pits are distributed on the surface. Both shape and distribution morphology of these pits indicate the crystal proper-ties: some pits are triangle or rectangle

and the pits are located along grain boundaries. But after corrosion of the W and C dual implantated steel samples

surface corrosion pits are shallow and small. Shallow corrosion pits are dislocated random

their shape and distribution are not provided with crystal properties. When the fluence is increased and after corrosion for 88 voltage scanning-loops

the surface corrosion pits are still shallow and small

showing the corrosion resistance to be enhanced further. Finally the mechanism of corrosion resistance was discussed.