H13 steel samples were implanted with C+Ti dual ions. The electrochemical polarization measurements showed that the C+Ti dual ion implantation could improve H13 steel’s corrosion resistance properties. The degree of improvement increased with the increasing Ti ion implantion doses. The pitting corrosion experiments showed that the dual ion implantation could also improve H13 steel’s pitting corrosion resistance. The TEM and SEM tests confirmed that a micrograin layer was produced on the surface

so the nucleus-formation spots of corrosion were decreased

and the corrosion resistance improved after the C+Ti ion implantation.