N-Alkyl-N'-Poly(Oxyalkyl)Hexahydropyrimidine-Quaternary Ammonium Salts And The Use Thereof As Corrosion Inhibitors

A process for inhibiting corrosion of metal, the process comprising bringing the metal into contact with at least one compound comprising N-alkyl-N′-poly(oxyalkyl)hexahydropyrimidine-quaternary ammonium salts of the formulae (Ia)-(Ic)

• in which
• R1 is C8-C30-alkyl or C8-C30-alkenyl,
• R2 is hydrogen, C1-C3-alkyl, —COOH or a radical selected from the formulae
• wherein
• the bonding occurs via the valence containing the B residue,
• B is a single bond or a C1 to C3 alkylene group
• R3 is C1-C4-alkyl, vinyl, allyl or benzyl,
• X− is a counterion,
• A is a 1,2-alkylene group having from 2 to 10 carbon atoms and
• p is a number from 1 to 50.