Materials compatibility was examined for the environments of hydriodic acid solution containing iodine (“HIx” solution) in the iodine-sulfur water splitting process. The testing environments were (1) HIx solution environment in the Bunsen reaction step, and (2) HIx solution environment in the high pressure distillation column. Ta and Si02 showed excellent corrosion resistance in the former environment. Ta and Nb did in the latter environment.
