| abstract |
Corrosion protection agent containing a) an imidazoline of the formula I, <IMAGE> wherein R¹ is hydrogen, C1-C6-hydroxyalkyl, C1-C6-aminoalkyl, C2-C19-carboxyalkyl or its ammonium or amine salts and R² is hydrogen, C1-C17-alkyl or C2-C17-alkenyl, b) a heterocyclic polyacid of the formula II, <IMAGE> in which R³ is C2-C6-carboxyalkyl or its alkali metal, alkaline earth metal, ammonium or amine salts, c) at least one alkanolamine of the formula III, < IMAGE> where R 4 is C1-C6-hydroxyalkyl and R 5 and R 6 are the same or different and are hydrogen, C1-C6-alkyl or C1-C6-hydroxyalkyl, and d) water are outstandingly suitable for the corrosion-inhibiting treatment of iron and steel fittings. |