Corrosion-inhibiting substance combination (I) capable of evaporating or sublimating, comprises (a) at least one 6-10C aliphatic monocarboxylic acid, (b) at least one 6-10C aliphatic dicarboxylic acid, (c) a primary aromatic amide, and (d) an aliphatic ester of hydroxybenzoic acid. An independent claim is included for a method of preparing (I) comprising mixing the components (a)-(d) and a benzimidazole compound.
