Aminosilane salts and silanamides of carboxylic acids as corrosion inhibitors

A coating composition comprising

• a) an organic film-forming binder and
• b) as corrosion inhibitor at least one salt (.alpha.) and/or at least one amide (.beta.), both components (.alpha.) and (.beta.) derived from i) a polyacrylic acid, an acrylic acid-maleic acid copolymer, or a carboxylic acid of the formula I ##STR60## in which R.sub.1 is hydrogen, C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl interrupted by oxygen or sulfur;
• C.sub.2 -C.sub.24 alkenyl, C.sub.4 -C.sub.15 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 allyl and/or carboxyl;
• C.sub.5 -C.sub.15 cycloalkenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl and/or carboxyl;
• C.sub.13 -C.sub.26 polycycloalkyl, C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl ring by C.sub.1 -C.sub.4 alkyl;
• --COR.sub.6, a 5- or 6-membered heterocyclic ring which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or carboxyl;
• a 5- or 6-membered heterocyclic ring which is benzo-fused and is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or carboxyl;
• or else R.sub.1 is a radical of the formula II, III or IV ##STR61## R.sub.2, R.sub.3, R.sub.4 and R.sub.5 independently of one another are hydrogen, hydroxyl, C.sub.1 -C.sub.18 alkoxy, C.sub.2 -C.sub.18 alkoxy which is interrupted by oxygen or sulfur;
• C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl which is interrupted by oxygen or sulfur;
• C.sub.2 -C.sub.24 alkenyl, C.sub.5 -C.sub.15 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• C.sub.5 -C.sub.15 cycloalkenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• phenyl or naphthyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl ring by C.sub.1 -C.sub.4 alkyl;
• C.sub.10 -C.sub.12 naphthylalkyl which is unsubstituted or substituted on the naphthyl ring system by C.sub.1 -C.sub.4 alkyl;
• or are --COR.sub.6, with the proviso that, if one of the radicals R.sub.2, R.sub.3, R.sub.4 and R:.sub.5 is hydroxyl, the other radical attached to the same carbon atom is other than hydroxyl;
• or else R.sub.2 and R.sub.3 or R.sub.4 and R.sub.5, together with the carbon atom to which they are attached, form an unsubstituted or C.sub.1 -C.sub.4 alkyl-substituted C.sub.5 -C.sub.12 cycloalkylidene ring,
• R.sub.6 is hydroxyl, C.sub.1 -C.sub.18 alkoxy, C.sub.2 -C.sub.18 alkoxy which is interrupted by oxygen or sulfur;
• or ##STR62## R.sub.7, R.sub.8, R.sub.9, R.sub.10 and R.sub.11 independently of one another are hydrogen, hydroxyl, halogen, nitro, cyano, CF.sub.3, --COR.sub.6, C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl which is interrupted by oxygen or sulfur;
• C.sub.1 -C.sub.25 haloalkyl, C.sub.1 -C.sub.18 alkoxy, C.sub.2 -C.sub.18 alkoxy which is interrupted by oxygen or sulfur;
• C.sub.1 -C.sub.18 alkylthio, C.sub.2 -C.sub.24 alkenyl, C.sub.5 -C.sub.15 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• C.sub.5 -C.sub.15 cycloalkenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• phenyl or naphthyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl ring by C.sub.1 -C.sub.4 alkyl;
• C.sub.10 -C.sub.12 naphthylalkyl which is unsubstituted or substituted on the naphthyl ring system by C.sub.1 -C.sub.4 alkyl;
• phenoxy or naphthoxy which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• C.sub.7 -C.sub.9 phenylalkoxy which is unsubstituted or substituted on the phenyl ring by C.sub.1 -C.sub.4 alkyl;
• C.sub.10 -C.sub.12 naphthylalkoxy which is unsubstituted or substituted on the naphthyl ring system by C.sub.1 -C.sub.4 alkyl;
• or else the radicals R.sub.8 and R.sub.9 or the radicals R.sub.9 and R.sub.10 or the radicals R.sub.10 and R.sub.11 or the radicals R.sub.7 and R.sub.11, together with the carbon atoms to which they are attached, form an unsubstituted or C.sub.1 -C.sub.4 alkyl-, halogen- or C.sub.1 -C.sub.4 alkoxy-substituted benzo ring, with the proviso that at least one of the radicals R.sub.7, R.sub.8, R.sub.9, R.sub.10 and R.sub.11 is hydrogen,
• R.sub.12 is hydroxyl, halogen, nitro, cyano, CF.sub.3, C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl which is interrupted by oxygen or sulfur;
• C.sub.1 -C.sub.25 haloalkyl, C.sub.1 -C.sub.18 alkoxy, C.sub.2 -C.sub.18 alkoxy which is interrupted by oxgyen or sulfur;
• C.sub.1 -C.sub.18 alkylthio or C.sub.2 -C.sub.24 alkenyl,
• R.sub.13 and R.sub.14 independently of one another are hydrogen, C.sub.1 -C.sub.25 alkyl, C.sub.1 -C.sub.18 alkoxy or --Y--(CH.sub.2).sub.s COR.sub.6,
• R.sub.15 and R.sub.16 independently of one another are hydrogen, C.sub.1 -C.sub.25 alkyl, C.sub.3 -C.sub.25 alkyl which is interrupted by oxygen or sulfur;
• C.sub.2 -C.sub.24 alkenyl, C.sub.5 -C.sub.15 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• phenyl or naphthyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl,
• X.sub.1 is a direct bond, oxygen, sulfur, ##STR63## C.sub.1 -C.sub.18 alkylene, C.sub.2 -C.sub.18 alkylene which is interrupted by oxygen or sulfur;
• C.sub.2 -C.sub.18 alkenylene, C.sub.2 -C.sub.18 alkynylene, C.sub.2 -C.sub.20 alkylidene, C.sub.7 -C.sub.20 phenylalkylidene or C.sub.5 -C.sub.8 cycloalkylene, with the proviso that, if m and n are 0, X.sub.1 is other than oxygen and sulfur,
• Y is oxygen or ##STR64## R.sub.a is hydrogen or C.sub.1 -C.sub.8 alkyl, m and n independently of one another are integers from 0 to 10,
• p is an integer from 0 to 4,
• s is an integer from 1 to 8, and
• ii) an aminosilane of the formula V ##STR65## in which R.sub.17 and R.sub.18 independently of one another are hydrogen, C.sub.1 -C.sub.25 alkyl, 2-hydroxyethyl, C.sub.3 -C.sub.25 alkyl which is interrupted by oxygen or sulfur;
• C.sub.2 -C.sub.24 alkenyl or ##STR66## R.sub.19 is C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl which is interrupted by oxygen or sulfur;
• hydroxyl, C.sub.1 -C.sub.81 alkoxy or C.sub.2 -C.sub.24 alkenyl,
• R.sub.20 is hydroxyl, C.sub.1 -C.sub.18 alkoxy or C.sub.2 -C.sub.18 alkoxy which is interrupted by oxygen or sulfur;
• and, if a and b together are 1, three radicals R.sub.20 together are N(CH.sub.2 CH.sub.2 O--).sub.3,
• R.sub.21 is hydrogen or C.sub.1 -C.sub.8 alkyl,
• X.sub.2 is C.sub.1 -C.sub.18 alkylene, C.sub.2 -C.sub.20 alkylidene, C.sub.7 -C.sub.20 phenylalkylidene, C.sub.5 -C.sub.8 cycloalkylene, phenylene or naphthylene which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl;
• or is C.sub.4 -C.sub.18 alkylene which is interrupted by oxygen, sulfur or ##STR67## with the proviso that two nitrogen atoms are not attached to the same carbon atom,
• a is 1 or 2, and
• b is 0, 1 or 2.