Comparison of descaling methods to study the corrosion kinetics of ferritic steels after dynamic exposure to molten carbonates

T91 ferritic-martensitic steel was exposed to Li, Na and K molten carbonates at 650ºC under dynamic conditions up 1000 h. After testing, three descaling methods, two from the ISO8407 one ISO17245 standards were applied remove corrosion products determine rates. The methods more appropriate although procedure required several steps fully products. method led a higher mass loss affecting probably base material. Oxides identification performed by XRD following step layers removal. Li-, Na-, K-containing oxides chromates/chromites detected.