The surface layer optimized in resistance of corrosion and wear has been obtained by W+C dual implantation on H13 steel. The electrochemical polarization measurements show that the peak current density ID is increased and then saturated with increasing of voltage scanning loops. The ID is 100 times smaller than that of H13 steel

and 2-3 times smaller than that of tungsten. The influence of dual implantation order on corrosion resistance is also studied. The ID for W 5C 8 implanted first with W is half of that for C 5W 5 implanted first with C. The corrosion resistance structure of the samples after corrosion is observed by SEM. The X-ray analysis indicates that the structure consists of disperse phases of WC

W2 C FeW

Fe 2W

FeW 2C and iron carbides. It is shown from Auger analysis that the optimum complex layer for corrosion resistance consists of thin carbon film on surface

disperse phases of these metal compounds in middle and then iron carbides layer below.