Patent ID: 8845930
Filing Date: 2014-09-30
Classification: C04B,C09D,C09K,C23F

Abstract:
1. A method of inhibiting corrosion of metal surfaces in a cooling system using a water-based coolant, the method comprising: preparing an oxyaminophosphate by: reacting the formed organic phosphate with 6-25% metal oxide and/or metal hydroxide to form the oxyaminophosphate; and drying the oxyaminophosphate; and contacting a mixture comprising the dried oxyaminophosphate with the water-based coolant, to form a corrosion protective layer internally on the metal surfaces, consisting of metal oxide and/or metal hydroxide precipitants, wherein the metal is magnesium, wherein the mixture is non-toxic; wherein a ratio of the metal oxide and/or metal hydroxide to phosphoric acid and/or inorganic phosphate is between 1:4 and 4:1, causing the formation of the corrosion protective layer through the precipitation of the metal oxide and/or metal hydroxide internally on the metal surfaces, wherein the thickness of said layer is between 1 to 100 nm.