High-temperature inhibitors of stainless steel corrosion in sulfuric acid solutions

The corrosion of chromium-nickel steel 08Kh18N10T in 2 M H 2 SO 4 has been studied in a broad temperature range, t = 0-200°C.Under these conditions, the metal corrosion is enhanced with an increase in t to reach 9.7 kg/(m 2 •h) at 200°C.It has been shown that a formulation of IFKhAN-92 inhibitor (a substituted triazole) with KI in a molar ratio of 1:1 protects this steel in 2 M H 2 SO 4 at temperatures up to 140°C, inclusive.The threecomponent mixture of IFKhAN-92, KI and urotropine (1:1:4) is more promising in this respect, as it efficiently inhibits corrosion at temperatures up to 180°C and allows the protective effect to be maintained for at least 8 h.This formulation also reliably protects low-carbon steel 20 in 2 M H 2 SO 4 at temperatures up to 180°C, inclusive; what is more, corrosion slows down with time in the presence of this mixture.