PNNL

Abstract

This review article is summarizing recent advances in barrier coatings to prevent hydrogen isotopes’ absorption ingress and permeation in order to avoid hydride formation and unwanted hydrogen effects in nuclear and renewable energy applications. The coating may be applied on a material that requires protection from hydrogen pick-up and hydride formation in hydrogen storage containers, in pipelines, spent nuclear fuel storage or in nuclear reactors. While existing, commercial coatings that have been much in use may be satisfactory for various applications, it is desirable to evaluate if alternative coating concepts can provide a greater resistance to hydrogen isotope permeation along with other improved properties, such as mechanical strength and thermal resistance. The information presented here is focusing on recent findings of promising hydrogen barriers including oxides, nitrides, carbon, carbide, MAX-phases and metals and their mechanical strength, hydrogen pick-up, radiation resistance and coating manufacturing techniques. Knowledge gaps were identified to provide guidance for future prospects.