PROCEDIMENTO E AGENTE PER PASSIVARE SUPERFICI DI FERRO E DI ACCIAIO

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: JURGEN GEKE, HERMANN DROSDZIOK, HANS GUNTHER GERMSCHEID
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creator JURGEN GEKE
HERMANN DROSDZIOK
HANS GUNTHER GERMSCHEID
description 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.
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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. 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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.</abstract><edition>3</edition><oa>free_for_read</oa></addata></record>
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subjects 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
title PROCEDIMENTO E AGENTE PER PASSIVARE SUPERFICI DI FERRO E DI ACCIAIO
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