Protection of low-carbon steel from corrosion in hydrochloric acid by 4-substituted 1,2,4-triazole

Abstract

A new corrosion inhibitor of low-carbon steel in hydrochloric acid solutions, IFKhAN-96, which is a derivative of 4-substituted 1,2,4-triazole and is more efficient than the known industrial inhibitor catamine AB, has been developed. Based on data of weight loss studies, IFKhAN-96 can be used for protection of low-carbon steels in hydrochloric acid solutions with wide ranges of concentration (1.0–6.0 M) and temperature (25–95°C). XPE spectroscopy showed that the high protective action of the IFKhAN-96 inhibitor against corrosion of steel is a consequence of the formation of the protective layer on the metal surface, which consists of a mixture of iron(II) chloride and oxide with a thickness of 4–7 nm. The adsorbed monolayer of IFKhAN-96 inhibitor is located above it.