Nitrite-based corrosion inhibitors with improved anodic and cath

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

1995-07-19

1997-06-03

Green, Anthony

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

106 1442, 106644, 106724, 106727, 106728, 106808, 106810, 106823, 524 2, 524 5, 524650, 526262, 528322, C04B 2208, C04B 2402, C09D 500

Patent

active

056349661

ABSTRACT:
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 increases 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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