Mo Ion Implantation Research Articles

Ion Implantation of Ti,Mo W,Mo+C and W+C in H13 Steel and Aluminum at Elevated Temperature

ABSTRACTThe chemical change in the surface of H13 steel or aluminum is produced by implanting a reactive elements, such as Ti, Mo and W. The X-ray diffraction pattern shows that implanted Ti at 400 C has reacted with carbon(0.35 in wt.%) forming a second phase TiC. Auger analysis shows that the carbon atoms have been condensed in the Ti implanted region. Carbon peak concentration of 30 At.% is greater than Ti atom peak concentration of 12 At.%.Several second phases are formed during pulsed Mo ion implantation 2 into aluminum with high ion flux of 50˜80µA/cm2 which raises the target temperature from 400°C to 600°C.More second phases are formed by dual Mo+C implantation with high dose of 3˜5×10 17/cm2 and high flux of 50˜75µA/cm2 . And the target temperature is raised from 400 to 600°C. The FeMo Fe3Mo2, Fe2MoC, Mo2C, MoC, MoCx, phases and iron carbides are identified by X-ray diffraction technique.

Effects of B, N, Cr and Mo ion implantation on the corrosion resistance of pure iron and its alloys (GCr15 and Cr4Mo4V)

The corrosion behaviors of B, N, Cr and Mo ions implanted into iron and its alloys were investigated in 0.5 M H 2SO 4 and 0.1 M NaCl buffered solution for the high fluence implantation and multi-implantation of Cr, Mo, N and B. The experimental results have shown that homogeneous and local corrosion of iron and its alloys were significantly improved by ion implantation. A qualitative order of corrosion resistance is (from best to worst) Cr+Mo+B, Cr+Mo+N, Cr+Mo, Cr, implanted. The corrosion rates were reduced by approximately three orders of magnitude in 0.5 M H 2SO 4 solution.

The effect of molybdenum ion implantation on the general and pitting corrosion behaviour of pure aluminium and a high strength aluminium alloy

The effect of Ar and Mo ion implantation on the corrosion behaviour of pure Al and a high strength aluminium alloy (7075-T6) has been investigated in Cl −-free and Cl −-containing sulphate solutions. In Cl −-free environments, Mo implantation markedly affects the general corrosion behaviour of both the pure metal and the alloy. Ar implantation, on the other hand, has no permanent effect on the potentiodynamic polarization behaviour of pure Al but does alter somewhat the polarization characteristics of 7075-T6. In Cl −-containing environments, Mo implantation significantly improves the resistance of pure Al to pitting corrosion, and increases the breakdown potential by about 200 mV. A similar, though less marked effect is observed with the alloy. Ar implantation has no major effect on the behaviour of either the pure metal or 7075-T6 in Cl −-containing environments. On the basis of Rutherford backscattering and potential-time measurements it is suggested that the beneficial effect of Mo may be due to either the incorporation of Mo in the passive film or to dissolution and reprecipitation of some Mo-containing species on the passive film.