EP 0716163 A1 19960612 - Chromating bath and process for finishing surfaces of zinc, zinc alloys or cadmium
Title (en)
Chromating bath and process for finishing surfaces of zinc, zinc alloys or cadmium
Title (de)
Lösung und Verfahren zum Chromatieren zur Endbehandlung von Zink, Zinklegierungen oder Cadmium
Title (fr)
Bain de chromatation et procédé pour la finition de surfaces de zinc, d'alliage de zinc, ou de cadmium
Publication
Application
Priority
FR 9414701 A 19941207
Abstract (en)
A chromating bath for anti-corrosion treatment of Zn, Zn alloy or Cd surfaces, esp. galvanised steel, comprises an aqueous soln. with a pH of 1-5 (pref. 1.2-1.8). The solution contains per litre 5-40 (pref. 7-15) g hexavalent Cr ions 5-20 (pref. 7-12) g sulphate ions, 0.1-0.3 (pref. 0.1-0.2) g Co ions, 0.1-0.65 (pref. 0.15-0.3) g Ag ions and 50-150 (pref. 70-120) ml of weak organic acid such as acetic, formic or oxalic acid.
Abstract (fr)
Procédé pour la finition de surfaces de zinc, d'alliage de zinc, ou de cadmium, consistant à mettre en contact les pièces à traiter d'abord avec un bain de chromatation acide à base de sels de chrome, de cobalt et d'argent, puis avec un bain de finition comprenant une silice colloïdale, un inhibiteur de corrosion, un agent complexant, un agent tensio-actif et un colorant noir.
IPC 1-7
IPC 8 full level
C23C 22/27 (2006.01); C23C 22/30 (2006.01); C23C 22/84 (2006.01)
CPC (source: EP KR US)
C23C 22/27 (2013.01 - EP KR US); C23C 22/30 (2013.01 - EP KR US); C23C 22/84 (2013.01 - EP KR US)
Citation (applicant)
- FR 2522023 A1 19830826 - WALDBERG [FR]
- EP 0264472 A1 19880427 - PROCOAT S A FA [ES]
Citation (search report)
- [Y] FR 947164 A 19490624 - UNITED CHROMIUM
- [Y] EP 0274543 A1 19880720 - NIHON PARKERIZING [JP]
- [A] GB 2216905 A 19891018 - NIHON PARKERIZING [JP]
- [DA] EP 0087288 A1 19830831 - M & T CHEMICALS INC [US] & FR 2522023 A1 19830826 - WALDBERG [FR]
- [A] EP 0508207 A1 19921014 - NIPPON KOKAN KK [JP]
- [A] DE 4005112 A1 19910627 - BOSCH GMBH ROBERT [DE]
- [X] CHEMICAL ABSTRACTS, vol. 111, no. 16, 16 October 1989, Columbus, Ohio, US; abstract no. 138906s, MARINESCU: "Passivation on zinc and cadmium coatings" XP000059807 & RO 94238 A2 19880330 - INST CERCETARI STIINTIFICE [RO]
- [A] PATENT ABSTRACTS OF JAPAN vol. 013, no. 255 (C - 606) 13 June 1989 (1989-06-13)
- [A] PATENT ABSTRACTS OF JAPAN vol. 014, no. 299 (C - 0733) 27 June 1990 (1990-06-27)
- [A] CHEMICAL ABSTRACTS, vol. 94, no. 18, 4 May 1981, Columbus, Ohio, US; abstract no. 144073q, DIKINIS: "Treatment of black chromate coatings" page 284; & HU 18661 A
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0716163 A1 19960612; EP 0716163 B1 19990120; CA 2164555 A1 19960608; CA 2164555 C 20010911; DE 69507441 D1 19990304; DE 69507441 T2 19990715; ES 2128679 T3 19990516; FR 2727983 A1 19960614; FR 2727983 B1 19970124; JP H08218182 A 19960827; KR 100322935 B1 20020627; KR 960023236 A 19960718; US 5876517 A 19990302
DOCDB simple family (application)
EP 95402602 A 19951120; CA 2164555 A 19951206; DE 69507441 T 19951120; ES 95402602 T 19951120; FR 9414701 A 19941207; JP 31084295 A 19951129; KR 19950047170 A 19951206; US 95971397 A 19971028