Patent ID: 6537678
Filing Date: 2003-03-25
Classification: C09D,C23F

Abstract:
A non-carcinogenic corrosion inhibiting additive comprising an anodic corrosion inhibitor and a cathodic corrosion inhibitorwherein the anodic corrosion inhibitor is a compound that is characterized by being soluble in alkaline media, while precipitating as a reduced, insoluble oxide under neutral and acidic reducing conditions, that is, existing as an insoluble oxide below âˆ’600 mv vs Ag/AgCl at pH 7, and below âˆ’300 mv vs Ag/AgCl at pH 2 and the cathodic corrosion inhibitor is a compound that is characterized by being soluble in acidic media, while undergoing a valance change to precipitate as an insoluble oxide under neutral and alkaline and moderately oxidizing conditions, that is, existing as an insoluble oxide above âˆ’300 mv vs Ag/AgCl at pH 7, and above âˆ’900 mv vs Ag/AgCl at pH 12.