溶融塩腐食に及ぼす重金属塩の影響

抄録

Laboratory corrosion tests were performed for investigating influence of heavy metallic salt on corrosion behavior of SUS310S and Hastelloy C22. The synthetic ashes with/without heavy metallic salt were used in the corrosion tests. The molten salt corrosion tests were performed at 510℃. It was found that the corrosion loss rate in NaCl-KCl-Na₂SO₄K₂SO₄-CaSO₄ simulated combustion ash with heavy metallic salt is higher than that in NaCl-KCl-Na₂SO₄-K₂SO₄-CaSO₄ simulated combustion ash. Based on the thermodynamic calculations, the simulated ash containing heavy metallic salts produced gas components, including sulfur oxidant and chloride, that enhanced the corrosion reaction compared to the corrosion reaction without heavy metallic salts.