Abstract Scope |
Our knowledge of chemistry and material compatibility in molten salt-cooled energy systems remains outpaced by interest in, and applications of, these salts in generating clean energy. This holds particularly true for molten fluoride salts. Compared to the dominating contribution of oxygen in chloride, sulfide, or nitrate systems, the behavior of oxygen in fluorides and the impact upon corrosion pathways are poorly understood. Though most initial oxygen content in the salt can be removed by purification, the oxygen in the environment can hardly be avoided, calling for understanding the behavior of oxygen in a molten fluoride system. Once present, oxygen can exist as a gas, oxygen anions, or oxyanions. This talk will show experimental results indicating the pathway of oxygen evolution in fluoride systems and the impact on corrosion of metals. Some metals, usually considered corrosion-resistant, are readily attacked in the presence of oxygen, suggesting the importance of understanding oxygen involvement. |