Uranium Ions Injected Carbon Adsorption Behavior

In this study, the Auger Electron Spectroscopy (AES) was used to study the adsorption process and initial stage of oxidation reactions on clean surface of pure iron,uranium and surface of their C⁺ ion-implanted samples.Firstly, AES was used to study adsorption and initial oxidation of pure iron , uranium and their C⁺ ion-implanted samples at different exposure doses of oxygen. The experimental results show that at room temperature the velocity of adsorption and initial oxidation on the surface of pure iron is quicker than that of its C⁺ ion-implanted samples. The curve of oxygenic adsorption on uranium is beeline. For C⁺ ion-implanted samples of uranium, the curve of oxygenic adsorption exists switched dot, the velocity of adsorption and initial oxidation reactions on the surface of its C⁺ ion-implanted samples decreases after the switched dot. The interactional odds of oxygen and the surface of C⁺ ion implanted samples is reduced , so the antioxidant properties of ion implanted surface is enhanced. At the same time, the analysis results of surface show that corresponding carbide form on the C⁺ ion-implanted samples. Due to formation of carbide, the diffusion of O^-(O^2-) in the interface region is prevented in the process of adsorption and initial oxidation reactions stage, accordingly the oxidation resistance of C⁺ ion-implanted sample to oxygen is greatly enhanced.Secondly, heated process of each sample after initial oxidation had been studied. Conclusions could be dropped out as below: at temperatures from 298K to 473K, increasing reaction temperature was of great benefit to oxidation reactions of oxygen on specimen's surface. When surface temperatures of pure ion, uranium and C⁺ ion-implanted samples increase, heating was observed to deplete surface oxygen by accelerating its transport into the bulk and separate carbon (ion implanted samples) was enriched on the surface. So there was carbide formed on the surface of C⁺ ion-implanted samples.Finally, the results of electrochemical corrosion indicate that ion-implanted C⁺ can effectively enhance anticorrosion properties of pure iron and uranium.