Patent ID: 6261346
Filing Date: 2001-07-17
Classification: C09K,C23F

Abstract:
A process for protecting a metal surface against corrosion, the process comprising:(a) providing a metal surface to be protected against corrosion;(b) providing a compound of the general formula (I): ##STR10##wherein R.sup.1, R.sup.2 and R.sup.3 each independently represent an alkyl or hydroxyalkyl group having from 1 to 4 carbon atoms, an aryl or alkylaryl group or a group corresponding to the general formula (II): ##STR11##wherein A.sup.- represents an anion, n is equal to 2 or 3, p is a number from 1 to 3 and R.sup.5 represents an alkyl or alkenyl group having from 7 to 23 carbon atoms and up to 3 double bonds, and R.sup.4 represents a group corresponding to the general formula (II) or (III): ##STR12##wherein R.sup.1, R.sup.2 and R.sup.3 are as defined above and Z represents --(CH.sub.2).sub.m -- or a group corresponding to the general formula (IV): ##STR13##wherein m is an integer of from 1 to 6, each X independently represents an --NH-- group or an oxygen atom and D represents a dimer fatty acid residue containing an average number of carbon atoms of from 36 to 54; and(c) contacting the metal surface with a corrosion-inhibiting effective amount of the compound.