EP 2503025 A1 20120926 - Multi-step corrosion-resistant treatment of metallic workpieces having at least partially zinc or zinc alloy surfaces
Title (en)
Multi-step corrosion-resistant treatment of metallic workpieces having at least partially zinc or zinc alloy surfaces
Title (de)
Mehrstufige korrosionsschützende Behandlung metallischer Bauteile, die zumindest teilweise Oberflächen von Zink oder Zinklegierungen aufweisen
Title (fr)
Traitement en plusieurs étapes de protection contre la corrosion des pièces métalliques ayant au moins partiellement une surface en zinc ou en alliages de zinc
Publication
Application
Priority
EP 11159220 A 20110322
Abstract (en)
Anticorrosive treatment of the metal surfaces of a component comprising at least partially surfaces of zinc or zinc alloys comprises contacting the component with an alkaline aqueous composition (A) and subsequently contacting with an acidic aqueous composition (B) for zinc phosphating, optionally with an intermediate rinsing step, and optionally with a preceding activation step. Anticorrosive treatment of the metal surfaces of a component comprising at least partially surfaces of zinc or zinc alloys comprises contacting the component with an alkaline aqueous composition (A) and subsequently contacting with an acidic aqueous composition (B) for zinc phosphating, optionally with an intermediate rinsing step, and optionally with a preceding activation step, where: the composition (A) comprises (a) at least 50 mg/l of iron(III) ions and (b) at least 100 mg/l of complexing agents (C) comprising organic compounds (C1) having at least one functional group of formula (-COOX), (-OPO 3X) and/or (-PO 3X) and/or condensed phosphates (C2); the composition (A) has a free alkalinity of at least one point, but less than 6 points and a pH value of 10.5-14; the composition (B) comprises (a1) 0.2-3 g/l of zinc(II) ions, (b1) 5-30 g/l of phosphate ions evaluated as phosphorus pentoxide and (c) less than 0.1 g/l of ionic compounds of metals of nickel and cobalt; and the composition (B) has a pH value of 2.5-3.6. X : H or an alkali metal and/or alkaline earth metal atom. An independent claim is included for a component, which at least partially contains zinc surfaces, where the zinc surfaces are coated by a two-layer system consisting of a first inner, iron-containing passive layer located on the zinc surface and a second outer, crystalline zinc phosphate layer located on the inner layer, the coating of the inner layer contains 20-150 mg/m 2>based on the element iron, and the coating of the outer layer is 0.5-3.5 g/m 2>.
Abstract (de)
Die vorliegende Erfindung betrifft das Gebiet der Phosphatierung zur korrosionsschützenden Vorbehandlung von Zinkoberflächen, wobei auf die Verwendung weitgehend Nickel- und Cobalt-freier Zinkphosphatierlösungen abgezielt wird. Mit der vorliegenden Erfindung wird eine Alternative zur Trikation-Zinkphosphatierung bereitgestellt, bei der die Zinkoberflächen eines Bauteils vor der Zinkphosphatierung zunächst mit einer alkalischen Zusammensetzung enthaltend Eisen(III)-Ionen passiviert und damit für eine weitgehend Nickel- und Cobalt-freie Zinkphosphatierung vorkonditioniert werden. Die Erfindung betrifft in einem weiteren Aspekt ein Bauteil, insbesondere eine Automobilkarosserie, das zumindest teilweise Oberflächen von Zink aufweist, wobei die Zinkoberflächen von einem Zweischichtsystem bestehend aus einer ersten inneren, auf der Zinkoberfläche aufliegenden Passivschicht enthaltend Eisen und einer zweiten äußeren, auf der inneren Schicht aufliegenden kristallinen Zinkphosphatschicht bedeckt sind.
IPC 8 full level
C23C 22/00 (2006.01); B05D 7/14 (2006.01); C23C 22/12 (2006.01); C23C 22/34 (2006.01); C23C 22/36 (2006.01); C23C 22/60 (2006.01); C23C 22/73 (2006.01); C23C 22/83 (2006.01)
CPC (source: EP KR US)
B05D 7/14 (2013.01 - KR); C23C 22/00 (2013.01 - KR); C23C 22/12 (2013.01 - EP US); C23C 22/34 (2013.01 - KR); C23C 22/364 (2013.01 - EP US); C23C 22/60 (2013.01 - EP KR US); C23C 22/73 (2013.01 - EP US); C23C 22/83 (2013.01 - EP KR US); C23F 11/184 (2013.01 - US); Y10T 428/12799 (2015.01 - EP US)
Citation (applicant)
- DE 19834796 A1 20000203 - HENKEL KGAA [DE]
- DE 19705701 A1 19980820 - HENKEL KGAA [DE]
- DE 4341041 A1 19950608 - HENKEL KGAA [DE]
- DE 19606017 A1 19970821 - HENKEL KGAA [DE]
- EP 1368508 A1 20031210 - HENKEL KGAA [DE]
Citation (search report)
- [A] DE 2317896 A1 19731115 - METALLGESELLSCHAFT AG
- [A] DE 1521854 B1 19701105 - METALLGESELLSCHAFT AG [DE]
- [A] DE 2017327 A1 19710121
- [A] US 3515600 A 19700602 - JONES WILLIAM N, et al
- [A] EP 0240943 A2 19871014 - METALLGESELLSCHAFT AG [DE]
- [A] DE 19733972 A1 19990211 - HENKEL KGAA [DE]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2503025 A1 20120926; EP 2503025 B1 20130703; BR 112013024075 A2 20161206; CA 2830676 A1 20120927; CA 2830676 C 20190326; CN 103492611 A 20140101; CN 103492611 B 20160330; ES 2428290 T3 20131106; JP 2014510197 A 20140424; JP 5956555 B2 20160727; KR 101858782 B1 20180628; KR 20140018942 A 20140213; MX 2013010758 A 20131007; MX 351392 B 20171013; PL 2503025 T3 20131231; TW 201241235 A 20121016; TW I585235 B 20170601; US 2014023882 A1 20140123; US 9534301 B2 20170103; WO 2012126734 A1 20120927
DOCDB simple family (application)
EP 11159220 A 20110322; BR 112013024075 A 20120307; CA 2830676 A 20120307; CN 201280018084 A 20120307; EP 2012053907 W 20120307; ES 11159220 T 20110322; JP 2014500315 A 20120307; KR 20137027679 A 20120307; MX 2013010758 A 20120307; PL 11159220 T 20110322; TW 101106639 A 20120301; US 201314031213 A 20130919