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Report No.

Corrosion resistance of materials of construction for high temperature sulfuric acid service in thermochemical IS process, Alloy 800, Alloy 600, SUSXM15J1 and SiC

Tanaka, Nobuyuki ; Onuki, Kaoru; Shimizu, Saburo; Yamaguchi, Akihisa*

Exposure tests of candidate materials were carried out up to 1000 hr in the sulfuric acid environments of thermochemical hydrogen production IS process, focusing on the corrosion of welded portion and of crevice area. In the gas phase sulfuric acid decomposition condition at 850$$^{circ}$$C, welded samples of Alloy 800 and of Alloy 600 showed the same good corrosion resistance as the bare materials. Also, in the boiling condition of 95wt% sulfuric acid solution, negligible corrosion was observed in crevice corrosion test sample of SiC.



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