Process and compositions for the passivation of iron and...

Details Process and compositions for the passivation of iron and... Process and compositions for the passivation of iron and...

C - Chemistry, Metallurgy

23

F

148/17

C23F 11/10 (2006.01)

Patent

CA 1169337

PROCESS AND COMPOSITIONS FOR THE PASSIVATION OF IRON AND STEEL SURFACES ABSTRACT OF THE DISCLOSURE A composition for the passivation of iron and steel surfaces consisting essentially of an aqueous alkaline solution having a pH of from 7.5 to 10.5 containing from 0.5% to 5% by weight of the total weight of a corrosion inhibitor combination of a) at least one monoalkylamide of maleic acid having from 6 to 14 carbon atoms in said monoalkyl, b) at least one alkanolamine having from 2 to 12 carbon atoms, c) at least one phosphonic acid capable of complexing metals, said combination forming a clear solution in water/ where the weight ratio of a:b is from 1:0.3 to 1:10 and the weight ratio of a:c is from 1:0.01 to 1:0.5; as well as the process of passi- vating iron and steel surfaces by treating the same with an effective amount of the above composition. The solutions can contain in addition tensides, preferably nonionic tensides, in small amounts, also builders, preferably phosphates and/or borates. The protection against corrosion, which is obtained with the claimed solutions, surpasses that of passivating agents used until now. -1-

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