Passivating iron or steel surface with aqs. nitrite soln. - synergistic mixt. with alkanolamine and carboxylic acid

Iron or steel surfaces are passivated by an aqs. alkaline soln. contg. 0.05-2% of, (a) >=1 7-10 C aliphatic carboxylic acid, (b) >=1 alkanolamines, (c) >=1 salts of nitrous acid, the molar ratio of carboxylic acid:alkanolamine being 1:0.3-5, and the weight ratio of carboxylic acid + alkanol...

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Bibliographische Detailangaben
Hauptverfasser:	PFEIFER,RUDOLF, DROSDZIOK,HERMANN, LINGMANN,HERBERT,DR
Format:	Patent
Sprache:	eng ; ger
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 SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	Iron or steel surfaces are passivated by an aqs. alkaline soln. contg. 0.05-2% of, (a) >=1 7-10 C aliphatic carboxylic acid, (b) >=1 alkanolamines, (c) >=1 salts of nitrous acid, the molar ratio of carboxylic acid:alkanolamine being 1:0.3-5, and the weight ratio of carboxylic acid + alkanolamine: nitrite being 20-1:1 and the pH of the soln. being 7.5-10. Pref. the carboxylic acid has 8 or 9 C and the molar ratio of carboxylic acid to alkanolamine is 1:1-3. The weight ratio of carboxylic acid + alkanolamine: nitrite is 10-3:1. The pH of the solution is adjusted with alkali and a non-ionic wetting agent in an amount of 0.005-0.3% may be added to the solution.