Physicochemical Changes and Mechanical Improvement of Ni Coating Layers Using High Energy Beam Treatment

Abstract

In this study, the improvement of mechanical properties by physicochemical changes of Ni coating layer after irradiation of high energy beam (HEB) was reported through spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), and nanoindenter. This surface heating method of the irradiation of HEB has advantages of short heating time, uniform temperature distribution, and high heat efficiency by selectively heating desired parts, compared to other post-heat treatment methods. The main reason for this is that irradiation of a irradiation of HEB on the Ni coating layer causes a change in the energy amplitude of the dipole formed in the material. Therefore, the intermolecular friction caused the Ni coating layer to be oxidized to NiO even in a short time, improving the mechanical properties of the surface. In order to understand the diffusion effect of the irradiation of HEB, the indentation hardness, and the skin depth of the Ni coating layer was experimentally performed and theoretically predicted simultaneously.