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Report No.

Corrosion resistance of plasma sprayed and laser treated material with curvature for thermochemical water-splitting iodine-sulfur process

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

Hydrogen is one of the promising major energy sources in the future. 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. To achieve a massive hydrogen production system, one of the key factors is the development of structural materials. A hybrid material that combined the corrosion-resistant and the pressure-resistant functions was made by a plasma spraying and laser treatment. The flat specimen of the hybrid material showed enough corrosion resistance in boiling sulfuric acid. To confirm the applicability of the hybrid material as the structural material, corrosion tests were performed in 98 wt.% boiling sulfuric acid using round bar specimens with the curved surface. The specimens showed enough corrosion resistance in boiling sulfuric acid though some cracks were observed in the surface layer from the cross section observation.



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