Alkaline earth metal salts, transition metal salts and transition metal complexes of ketocarboxylic acids as corrosion inhibitors

摘要

Novel alkaline earth metal salts and transition metal salts as well as transition metal complexes of compounds of the formula I IMAGE in which R1, R2, R3, R4 and R5 independently of one another are hydrogen, halogen, nitro, cyano, CF3, C1-C15-alkyl, C5-C12-cycloalkyl, C2-C15-alkenyl, C1-C12-haloalkyl, C1-C12-alkoxy, C1-C12 -alkylthio, C6-C10-aryl which is unsubstituted or substituted by C1-C4-alkyl; C6-C10-aryloxy which is unsubstituted or substituted by C1-C4-alkyl; C7-C12-arylalkyl which is unsubstituted or substituted on the aryl radical by 1 to 3 C1-C4-alkyl; -CO2R6, -COR6 or IMAGE at least one of the radicals R1 to R5 being hydrogen, halogen or C1-C15-alkyl, and also the radicals R1 and R2, R2 and R3, R3 and R4 or R4 and R5, together with the carbon atoms to which they are bonded, forming a benzo or cyclohexenyl ring, R6 is C1-C20-alkyl, C2-C20-alkyl interrupted by oxygen, sulphur or N-R9, C7-C12-arylalkyl which is unsubstituted or substituted on the aryl radical by 1 to 3 C1-C4-alkyl, R7 and R8 independently of one another are hydrogen, C1-C24-alkyl or C1-C24-alkyl which is interrupted by oxygen, sulphur or 1-R9, R9 is hydrogen or C1-C8-alkyl, and n is an integer in the range from 1 to 10, as corrosion inhibitors in coating compositions for the protection of metallic surfaces are described.