For the formation of a dense oxide film for use as an anticorrosion film with self-diagnosis and self-healing functions on the surface of structural materials, liquid blankets, and liquid divertors of thermonuclear fusion reactors, we investigated the self-oxidation of zirconium (Zr) at 500°C in air. The microstructure, composition (O/Zr ratio), crystal structure, and formation mechanism of the film were clarified through scanning electron microscopy, energy dispersive X-ray analysis, and X-ray diffraction analysis. It was demonstrated that the dense oxide film could be prepared, and its film exhibited a continuous and layered structure that consists of multiple phases. The outermost surface was unstrained monoclinic ZrO2. The growth of the oxide film adheres to a parabolic rate law.
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Nuclear Energy and Engineering
- Materials Science(all)
- Mechanical Engineering