Inhibition of corrosion in aqueous systems

Details Inhibition of corrosion in aqueous systems Inhibition of corrosion in aqueous systems

C - Chemistry, Metallurgy

23

F

31/51

C23F 11/14 (2006.01) C23F 11/10 (2006.01) C23F 11/167 (2006.01) C23F 11/173 (2006.01)

Patent

CA 2015718

ABSTRACT THE INHIBITION OF CORROSION IN AQUEOUS SYSTEMS A method for controlling corrosion in an aqueous system which comprises incorporating in the system at least one phosphonate of the formula: Image (I) in which R1 represents hydrogen or a C1-C4 alkyl group and R2 represents -COOH or -PO3H2 or a salt thereof, and at least one polyampholyte which possesses recurring units of the formula (II) Image and either recurring units of the formula: (III) Image or recurring units of the formula Image (IV) in which R1 represents hydrogen or a C1-C4 alkyl group, X represents hydrogen or -COOH, Y represents Image in which Z represents -O- or -NH-, n is 2 or 3 and R2, R3, R4 and R5 individually represent C1-C4 alkyl, especially methyl or ethyl, and A represents an anion especially Cl, Br, CH3SO4 or C2H5SO4, or a salt thereof.

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