Evaluation of container using hybrid technique for thermochemical water-splitting iodine-sulfur process

Ioka, Ikuo  ; Kuriki, Yoshiro*; Iwatsuki, Jin ; Kubo, Shinji  ; Yokota, Hiroki*; Kawai, Daisuke*

A thermochemical water-splitting iodine-sulfur processes (IS process) is one of candidates for the large-scale production of hydrogen using heat from solar power. Severe corrosive environment which is thermal decomposition of sulfuric acid exists in the IS process. A hybrid material with the corrosion-resistance and the ductility was made by a plasma spraying and laser treatment. The specimen had excellent corrosion resistance in the condition of 95 mass% boiling sulfuric acid. This was attributed to the formation of SiO on the surface. A corrosion test of the container was performed in 95 mass% boiling sulfuric acid until 500 hours to evaluate the corrosion characteristic of the container. No peeling was observed on the inner surface of the container after the corrosion test. The container had excellent corrosion resistance in the condition of 95 mass% boiling sulfuric acid.