The Corrosion of a 50Cr-50Ni Alloy in Liquid Vanadate Systems in the Temperature Range 750–950°C

A 50Cr-50Ni commercial alloy has been corroded in pure V₂O₅ and in vanadate melts containing sodium, sulphate, and chloride in the temperature range 750–950° C in a rotating disk apparatus. The results are discussed in terms of the material’s capability of forming a protective barrier layer and the subsequent dissolution of this layer into the liquid vanadate melt. Marked internal oxidation of a chromium rich phase has been noted throughout the temperature range. At 750 and 810° C this is associated only with chloride containing melts, but at 950° C the attack, while enhanced by chloride, also occurs in nonchloride melts.