Corrosion of metallic surfaces by aqueous alkanolamine solutions employed in acid gas removal is inhibited by combinations of particular vanadium compounds and an organic compound selected from the group consisting of nitro-substituted aromatic acids, nitro-substituted acid salts, and 1,4-naphthoquinone, preferably from the group consisting of p- nitrobenzoic acid, m-nitrobenzoic acid, 3,5-dinitrobenzoic acid, p- nitrophenol, m-nitrophenol, m-nitrobenzenesulfonic acid, 1,4- naphthoquinone, and mixtures thereof.
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