Improved corrosion inhibiting formulations with calcium nitrite

Details Improved corrosion inhibiting formulations with calcium nitrite Improved corrosion inhibiting formulations with calcium nitrite

C - Chemistry, Metallurgy

04

B

C04B 14/00 (2006.01) C04B 22/00 (2006.01) C04B 24/00 (2006.01) C04B 28/04 (2006.01)

Patent

CA 2211408

An admixture for cement compositions is provided which contributes both anodic and cathodic corrosion inhibition, and the cement compositions containing such additives. The cement additive is a combination of an anodic corrosion inhibitor such as calcium nitrite, and a cathodic corrosion inhibitor such as calcium stearate or other fatty acid. The mixed inhibitors in accordance with the invention provide as good or better corrosion inhibition than does calcium nitrite when used alone.

L'invention concerne des additifs de compositions de ciment contribuant à l'inhibition de la corrosion à la fois anodique et cathodique, ainsi que les compositions de ciment contenant ces additifs. Ces derniers sont constitués par une combinaison d'un inhibiteur de corrosion anodique, tel que du nitrite de calcium, et d'un inhibiteur de corrosion cathodique, tel que du stéarate de calcium ou un autre acide gras. Le mélange de ces inhibiteurs permet d'obtenir un effet d'inhibition de la corrosion égal ou supérieur à celui du nitrite de calcium lorsqu'il est utilisé seul.

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