A Polymer Nano-Composite Based Corrosion and Radiation Coating For Radioactive Waste Storage Containers

Abstract

The safe storage of radioactive waste presents critical challenges requiring materials that provide simultaneous protection against corrosion and radiation penetration. This research develops and characterizes a novel polymer nano-composite coating specifically designed for radioactive waste storage containers. We synthesized epoxy-based composite coatings incorporating tungsten oxide (WO₃) and zinc oxide (ZnO) nanoparticles at varying concentrations to achieve dual functionality. The coating formulations were optimized through systematic variation of nanoparticle loading from 5% to 25% by weight. Characterization using scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy confirmed uniform nanoparticle dispersion and successful polymer matrix formation. Gamma radiation attenuation tests demonstrated that coatings with 20% WO₃ achieved 78% radiation shielding efficiency compared to 42% for pure epoxy. Corrosion resistance evaluation through electrochemical impedance spectroscopy and salt spray testing revealed that ZnO incorporation increased corrosion protection by 85% relative to uncoated steel. The optimized composite coating containing 15% WO₃ and 10% ZnO exhibited excellent adhesion strength of 12.3 MPa, maintained integrity after 500 hours of accelerated weathering, and showed minimal degradation under gamma irradiation up to 100 kGy. This research provides practical solutions for enhancing radioactive waste container longevity while ensuring environmental safety through superior containment performance.