FR2331628A1 - Chromium electroplating bath using trivalent chromium - with complex forming chemicals such as hypophosphites and glycine - Google Patents

Chromium electroplating bath using trivalent chromium - with complex forming chemicals such as hypophosphites and glycine

Info

Publication number
FR2331628A1
FR2331628A1 FR7534794A FR7534794A FR2331628A1 FR 2331628 A1 FR2331628 A1 FR 2331628A1 FR 7534794 A FR7534794 A FR 7534794A FR 7534794 A FR7534794 A FR 7534794A FR 2331628 A1 FR2331628 A1 FR 2331628A1
Authority
FR
France
Prior art keywords
chromium
hypophosphites
glycine
complex
electroplating bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7534794A
Other languages
French (fr)
Other versions
FR2331628B3 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Lead Zinc Research Organization Inc
Original Assignee
International Lead Zinc Research Organization Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Lead Zinc Research Organization Inc filed Critical International Lead Zinc Research Organization Inc
Priority to FR7534794A priority Critical patent/FR2331628A1/en
Publication of FR2331628A1 publication Critical patent/FR2331628A1/en
Application granted granted Critical
Publication of FR2331628B3 publication Critical patent/FR2331628B3/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium
    • C25D3/06—Electroplating: Baths therefor from solutions of chromium from solutions of trivalent chromium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Abstract

Process for prepg. an aq. bath for the electrodeposn. of chromium, comprises (a) making an aq. soln. with pH 2.5-5 contg. min. 0.1 N dissolved triavelent Cr ions plus at least sufficient weak complex former to form a complex with all the Cr; (b) maintaining the pH value for >=5 mins.; (c) adding an acid to lower the pH to 1-4. The complex former is pref. selected from hypophosphites, glycine, gluconates, glycolates, formates, or formamide, and in step (b) the soln. may be heated and/or held =60 hrs. at pH 2.5-5. Several pref. baths are listed including compsn.: 0.1-2 M Cr3+, with 0.1-6 M. complex former and 0.03-1 M boric acid or borate. Bath avoids the use of hexavalent Cr which involves serious effluent problems, but is less costly than other trivalent Cr solns.
FR7534794A 1975-11-14 1975-11-14 Chromium electroplating bath using trivalent chromium - with complex forming chemicals such as hypophosphites and glycine Granted FR2331628A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7534794A FR2331628A1 (en) 1975-11-14 1975-11-14 Chromium electroplating bath using trivalent chromium - with complex forming chemicals such as hypophosphites and glycine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7534794A FR2331628A1 (en) 1975-11-14 1975-11-14 Chromium electroplating bath using trivalent chromium - with complex forming chemicals such as hypophosphites and glycine

Publications (2)

Publication Number Publication Date
FR2331628A1 true FR2331628A1 (en) 1977-06-10
FR2331628B3 FR2331628B3 (en) 1978-08-18

Family

ID=9162408

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7534794A Granted FR2331628A1 (en) 1975-11-14 1975-11-14 Chromium electroplating bath using trivalent chromium - with complex forming chemicals such as hypophosphites and glycine

Country Status (1)

Country Link
FR (1) FR2331628A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2394621A2 (en) * 1977-06-14 1979-01-12 Ibm PROCESS AND SOLUTION FOR ELECTROLYTIC DEPOSITS OF CHROME AND CHROME ALLOYS
CN115485420A (en) * 2020-04-23 2022-12-16 萨夫罗克有限公司 Aqueous electroplating bath and use thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2394621A2 (en) * 1977-06-14 1979-01-12 Ibm PROCESS AND SOLUTION FOR ELECTROLYTIC DEPOSITS OF CHROME AND CHROME ALLOYS
CN115485420A (en) * 2020-04-23 2022-12-16 萨夫罗克有限公司 Aqueous electroplating bath and use thereof
US11781232B2 (en) 2020-04-23 2023-10-10 Savroc Ltd Aqueous electroplating bath and its use
US11795559B2 (en) 2020-04-23 2023-10-24 Savroc Ltd Adhesion of a chromium-based coating on a substrate
US12006586B2 (en) 2020-04-23 2024-06-11 Savroc Ltd Object comprising a chromium-based coating with a high Vickers hardness, production method, and aqueous electroplating bath therefor

Also Published As

Publication number Publication date
FR2331628B3 (en) 1978-08-18

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Legal Events

Date Code Title Description
ST Notification of lapse