Enhanced galvanized corrosion inhibitor
AssigneeJohnsonDiversey, Inc.
InventorsJames Emerson, Lyle Steimel
Life of this patent
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Abstract
The corrosion inhibiting activity of quaternary ammonium compounds is enhanced by the addition of a carbamide, specifically urea. In particular, the arylquinolinium halide corrosion inhibitor's activity with respect to a galvanized surface is significantly enhanced by the addition of the urea.
Claims24
A method of removing scale on a surface comprising applying to said surface an acidic composition comprising an acid, a quaternary ammonium corrosion inhibitor and a water soluble carbamide.
A corrosion inhibitor comprising an aryl quaternary ammonium compound in combination with urea.
The composition claimed in claim 14 further comprising a thickening agent.
The method of preventing corrosion on a galvanic surface comprising applying to said galvanic surface a composition comprising 1-benzylquinolinium chloride in combination with urea.
A method of removing white rust from galvanized surfaces of a cooling tower comprising draining water from said cooling tower, applying an acidic gel to said galvanic surfaces for a period of time sufficient to dissolve said white rust wherein said acidic gel comprises a gelling agent, and acid and a corrosion inhibitor.
A gel for removing white rust comprising an acid, an acid thickener, urea and a quaternary ammonium compound.
Dependencies are inferred from the claim text.