PROCESS AND COMPOSITIONS FOR THE PASSIVATION OF IRON AND STEEL SURFACES

PCT No. PCT/EP81/00128 Sec. 371 Date Apr. 5, 1982 Sec. 102(e) Date Apr. 5, 1982 PCT Filed Aug. 19, 1981 PCT Pub. No. WO82/00665 PCT Pub. Date Mar. 4, 1982.The metal surfaces are treated with 0.5 to 5 wt. % aqueous solutions (pH value 7.5 to 10.5), in which is contained a synergistic combination-givi...

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Hauptverfasser:	DROSDZIOK HERMAN, GEKE JUERGEN, GERMSCHEID HANS GUENTHER
Format:	Patent
Sprache:	eng
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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Zusammenfassung:	PCT No. PCT/EP81/00128 Sec. 371 Date Apr. 5, 1982 Sec. 102(e) Date Apr. 5, 1982 PCT Filed Aug. 19, 1981 PCT Pub. No. WO82/00665 PCT Pub. Date Mar. 4, 1982.The metal surfaces are treated with 0.5 to 5 wt. % aqueous solutions (pH value 7.5 to 10.5), in which is contained a synergistic combination-giving a clear solution in water-of corrosion-inhibiting substances. The combination consists of: a. one or more maleic acid mono-n- or -iso-alkylamides with 6 to 14, preferably 8 to 10 C atoms, b. one or more alkalolamines, preferably mono-, di- and/or tri-ethanolamine, and c. complexing phosphonic acids, preferably 1-hydroxy-alkyl-1,1-diphosphonic acid, 1-aminoalkyl-1,1-diphosphonic acid, phosphonocarboxylic acid and/or a phosphonic acid of the formula: Preferred phosphonic acids are 1-hydroxyethane-1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid and/or nitrilotrimethylene-phosphonic acid. The weight ratio of a:b should be in the solutions 1:0.3 to 1:10, that of a:c, 1:0.01 to 1:0.5. The solutions can contain additionally surfactants, preferably non-ionogenic surfactants in small quantities, also builders, preferably phosphates and/or borates.