Patent ID: 6143243
Filing Date: 2000-11-07
Classification: C09K,C23F

Abstract:
A method for inhibiting the cavitation-erosion corrosion of aluminum surfaces comprising the step of contacting said surfaces with a formulation comprising a corrosion inhibitor composition, said corrosion inhibitor composition comprises (a) one or more carboxylic acids, or salts thereof, and (b) a polymerizable-acid graft polymer comprising from about 1.0% to about 60% by weight of an unsaturated grafting acid and an alkylene oxide polymer, said polymerizable-acid graft polymer having the following formula:R""--[(OC.sub.n H.sub.2n).sub.z OR'].sub.awhereineach R' is independently selected from the group consisting of a hydrogen atom, hydrogen radicals and acyl radicals free of aliphatic unsaturation;R"" is selected from the group consisting of a hydrogen atom, hydrogen radicals, amine-containing radicals and acyl radicals, provided that all the R' and R"" groups are not, at the same time, a hydrogen atom;each ""n"" has, independently, a value of from 2 to 4;each ""z"" has, independently, a value of from 4 to about 3500;""a"" has a value of from 1 to 4and said formulation further comprising an alkali metal hydroxide in an amount sufficient to adjust the pH of the formulation to from 6.0 to 9.0.