Development of hybrid material using plasma spraying for thermo-chemical hydrogen production IS process

Iwatsuki, Jin ; Ioka, Ikuo  ; Kuriki, Yoshiro*; Kubo, Shinji  ; Inagaki, Yoshiyuki

JAEA has pursued the development of a thermochemical water-splitting iodine-sulfur process (IS process) to realize hydrogen production systems for high temperature gas cooled reactors. The IS process is a chemical process to produce hydrogen and oxygen from water by combining chemical reactions of iodine (I) and sulfur (S). One of important tasks is to develop corrosion-resistant structural materials because the process uses very corrosive chemicals such as sulfuric acid. A surface reforming technique forming a corrosion-proof coating was introduced to develop a material which is provided with workability, strength, and corrosion resistance. Specimens was fabricated using a silicon plasma spraying, which were examined for corrosion resistance in sulfuric acid solution, concentrations of 47wt% and 95wt%, at temperature of the boiling points. Test results showed the technique is promising to improve corrosion resistance in such harsh environment.