抄録
An iodine-sulfur based thermochemical water splitting (IS process) for hydrogen production has been developed by JAEA as application of a high-temperature gas cooled reactor. The IS process includes a severe corrosion environment which is made to boil and decompose concentrated sulfuric acid. Two kinds of brittle materials, SiC and Fe-high Si alloy, were reported as materials having enough corrosion resistance in this corrosion environment. The hybrid pipe consisting of the Fe-high Si alloy with boiling sulfuric acid-resistant and the carbon steel with the ductility was produced by centrifugal casting. An evaluation of the characteristics was carried out. The Fe-high Si alloy lining showed enough corrosion resistance in boiling concentrated sulfuric acid. Thermal cyclic tests (100-900 ℃) were executed in order to evaluate the interface between the carbon steel and the Fe-high Si alloy. There was no detachment of the interface and it was confirmed that the interface possessed the enough strength.
