Nitrite-based corrosion inhibitors with improved anodic and...

Details Nitrite-based corrosion inhibitors with improved anodic and... Nitrite-based corrosion inhibitors with improved anodic and...

C - Chemistry, Metallurgy

04

B

C04B 24/26 (2006.01) C04B 14/36 (2006.01) C04B 24/02 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2181518

Mixed anodic/cathodic corrosion inhibitors for use in hydraulic cement, comprising a) a first component consisting of an amount of alkali or alkaline earth metal nitrite sufficient to inhibit anodic corrosion; and b) a second component comprising an agent that acts to increase the anodic corrosion performance of the first component; wherein said first and second components are present in a weight ratio of from about 1:0.1 to 1:1. Optionally an EO/PO superplasticizer can be incorporated where the weight ratio of the first component, i.e., nitrite, to EO/PO superplasticizer is from about 1:0.005 to 1:0.25, with the surprising benefit of increased protection against cathodic corrosion without harming the level of anodic corrosion inhibition.

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