EP 0058711 A1 19820901 - PROCESS AND PRODUCT FOR THE PASSIVATION OF IRON AND STEEL SURFACES.
Title (en)
PROCESS AND PRODUCT FOR THE PASSIVATION OF IRON AND STEEL SURFACES.
Title (de)
VERFAHREN UND MITTEL ZUM PASSIVIEREN VON EISEN-UND STAHLOBERFLÄCHEN.
Title (fr)
PROCEDE ET PRODUIT POUR PASSIVER LES SURFACES EN FER ET EN ACIER.
Publication
Application
Priority
DE 3032226 A 19800827
Abstract (en)
[origin: WO8200665A1] Metal surfaces are treated with 0,5 to 5% by weight of aqueous solutions (pH 7.5 to 10.5) containing a combination of anticorrosive substances giving a clear aqueous solution. This combination includes: a) one or several alkylamides of n-monomaleic or isomaleic acid with 6 to 14, preferably 8 to 10 carbon atoms. b) one or several alkanolamines, preferably mono-, di and/or triethanolamine and c) complexing phosphonic oxides, preferably 1-hydroxy-alkyl-1, 1-diphosphonic oxyde, 1-aminoalkyl-1 acid, 1-diphosphonic, phosphonocarbonic acid and/or a phosphonic acid having the formula: (FORMULA) Preferred phosphonic acids are 1-hydroxyethane-1, 1-diphosphonic, 2-phosphonobutane-1,2,4-tricarbonic and/or nitrilotrimethylenphosphonic acid. The ratio a:b in the solutions has to be from 1:0,3 to 1:10, the ratio a:c has to be from 1:0.01 to 1:0,5. The solutions may further contain surfactants, preferably phosphates and/or borates. These solutions provide a better protection against corrosion than that obtained with the means used heretofore.
Abstract (fr)
On traite les surfaces metalliques avec des solutions aqueuses a 0,5 a 5% en poids (pH 7,5 a 10,5) renfermant une combinaison de substances anticorrosives donnant une solution aqueuse limpide. Cette combinaison se compose de: a) un ou plusieurs alkylamides de l'acide n - monomaleique ou isomaleique avec 6 a 14, de preference 8 a 10 atomes de carbone, b) un ou plusieurs alkanolamines, de preference la mono-, di et/ou triethanolamine et c) des oxydes phosphoniques complexants, de preference l'oxide 1-hydroxy-alkyl-1,1-diphosphonique, l'acide 1-aminoalkyl-1,1-diphosphonique, l'acide phosphonocarbonique et/ou un acide phosphonique de formule: (FORMULE) Des acides phosphoniques preferes sont l'acide 1-hydroxyethane-1,1-diphosphonique, l'acide 2-phosphonbutane-1,2,4-tricarbonique et/ou l'acide nitrilotrimethylenephosphonique. Le rapport de a:b dans les solutions doit etre de 1:0,3 a 1:10, celui de a:c de 1:0,01 a 1:0,5. Les solutions peuvent, en outre, renfermer des agents tensio-actifs, de preference des phosphates et/ou des borates. Ces solutions permettent d'obtenir une meilleure protection contre la corrosion que celle obtenue avec les moyens employes jusqu'a present.
IPC 1-7
IPC 8 full level
C23F 11/14 (2006.01); C23C 22/62 (2006.01); C23F 11/10 (2006.01); C23F 11/16 (2006.01)
CPC (source: EP US)
C23F 11/10 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE GB NL SE
DOCDB simple family (publication)
WO 8200665 A1 19820304; BE 890068 A 19811216; BR 8108760 A 19820706; CA 1169337 A 19840619; DE 3032226 A1 19820401; DE 3164174 D1 19840719; EP 0058711 A1 19820901; EP 0058711 B1 19840613; ES 504978 A0 19820816; ES 8206660 A1 19820816; FR 2489372 A1 19820305; FR 2489372 B1 19860411; IT 1137644 B 19860910; IT 8123630 A0 19810825; JP H0132313 B2 19890630; JP S57501289 A 19820722; MX 157164 A 19881031; US 4437898 A 19840320; ZA 815967 B 19820929
DOCDB simple family (application)
EP 8100128 W 19810819; BE 205753 A 19810825; BR 8108760 A 19810819; CA 383308 A 19810806; DE 3032226 A 19800827; DE 3164174 T 19810819; EP 81902484 A 19810819; ES 504978 A 19810826; FR 8116392 A 19810827; IT 2363081 A 19810825; JP 50286281 A 19810819; MX 18889781 A 19810826; US 36502582 A 19820405; ZA 815967 A 19810827