PROCESS AND COMPOSITIONS FOR THE PASSIVATION OF IRON AND STEEL SURFACES

PROCESS AND COMPOSITIONS FOR THE PASSIVATION OF IRON AND STEEL SURFACES 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 inhibito...

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Bibliographische Detailangaben
Hauptverfasser:	GEKE, JUERGEN, DROSDZIOK, HERMANN, GERMSCHEID, HANS-GUENTHER
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PROCESS AND COMPOSITIONS FOR THE PASSIVATION OF IRON AND STEEL SURFACES 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 passivating 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.