(19)
(11) EP 3 241 928 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.01.2018 Bulletin 2018/02

(43) Date of publication A2:
08.11.2017 Bulletin 2017/45

(21) Application number: 17168294.1

(22) Date of filing: 26.04.2017
(51) International Patent Classification (IPC): 
C25D 3/06(2006.01)
C25D 5/18(2006.01)
 C25D 3/10(2006.01)
C25D 17/10(2006.01)
(84) Designated Contracting States:
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 States:
BA ME
Designated Validation States:
MA MD

(30) Priority: 02.05.2016 US 201615144688

(71) Applicant: The Boeing Company
Chicago, IL 60606-1596 (US)

(72) Inventors:
  • IJERI, Vijaykumar S.
    Huntington Beach, CA 92647 (US)
  • PRAKASH, Om
    Huntington Beach, CA 92647 (US)
  • GAYDOS, Stephen P.
    Huntington Beach, CA 92647 (US)
  • MOHAN, Subramanian
    Huntington Beach, CA 92647 (US)

(74) Representative: Harris, Jennifer Lucy et al
Kilburn & Strode LLP Lacon London 84 Theobalds Road
London WC1X 8NL
London WC1X 8NL (GB)

   


(54) TRIVALENT CHROMIUM PLATING FORMULATIONS AND PROCESSES


(57) An electrolyte solution for chrome plating from trivalent chromium is prepared by dissolving in an aqueous medium a trivalent chromium salt (e.g., chromium (III) chloride or chromium (III) sulfate), dissolving an oxalate compound (e.g., sodium oxalate, potassium oxalate, or oxalic acid), dissolving a metal salt (e.g., aluminum sulfate or aluminum chloride), dissolving an alkali metal sulfate (e.g., sodium sulfate or potassium sulfate), and dissolving an alkali metal halide (e.g., sodium fluoride or potassium fluoride). A substrate is chrome plated from trivalent chromium using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit chromium on the substrate.







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