Patent ID: 7468158
Filing Date: 2008-12-23
Classification: C01D,C23F

Abstract:
1. A method of protecting metallic materials in chlorate ion containing, sodium hydoxide solutions comprising: reducing the corrosive effects of the chlorate ions contacting the metallic materials by adding a polyamine to the chlorate ion containing, sodium hydroxide solution having a sodium hydroxide concentration of 5 to 95% by weight, and wherein the polyamine is selected from the group consisting of the reaction products of dichloroethane with ammonia and/or amines, or from the group consisting of the reaction products of ethylene oxide with ammonia or amines, or wherein the polyamine has one of the formulae (II) and (III) below: where n is 0 or an integer from 1 to 300, p, q, s and t are each 1 or 2, and r is 0 or 1, where the sum of the substituents on a nitrogen is three or an anion, additionally present to balance the charge when a nitrogen is bound to 4 substituents, or wherein the polyamine has the formula (IV) below: where v is H or an aminoalkyl radical.