US3902978A - Electroplating bath for preparation of glossy rhodium coating - Google Patents

Electroplating bath for preparation of glossy rhodium coating Download PDF

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Publication number
US3902978A
US3902978A US459370A US45937074A US3902978A US 3902978 A US3902978 A US 3902978A US 459370 A US459370 A US 459370A US 45937074 A US45937074 A US 45937074A US 3902978 A US3902978 A US 3902978A
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US
United States
Prior art keywords
chloride
liter
grams
rhodium
bath according
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.)
Expired - Lifetime
Application number
US459370A
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English (en)
Inventor
Wolfgang Zilske
Wolfgang Engelhardt
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Application granted granted Critical
Publication of US3902978A publication Critical patent/US3902978A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C25D3/50—Electroplating: Baths therefor from solutions of platinum group metals

Definitions

  • the present invention is directed to a rhodium electroplating bath to which a metal chloride is added to obtain a glossy coating.
  • the problem of the present invention was to develop a bath from which glossy rhodium layers of over 0.2 mu thickness could be deposited.
  • the rhodium electroplating bath for example can contain 2 to 10 grams per liter of rhodium phosphate, and 10 to 40 grams per liter of phosphoric acid or 2 to 10 grams per liter of rhodium sulfate and 20 to 60 grams per liter of sulfuric acid.
  • chlorides were considered as disturbing impurities in rhodium baths which caused gray and matte coatings. It has now been surprisingly found that by the addition of chlorides of metals of main groups I and ll of the periodic system as well as aluminum chloride and/or chromium (lll) that it is possible to deposit glossy rhodium layers having a thickness of 1 my. (one millimicron) or greater from otherwise conventional rhodium electroplating baths. It has been found advantageous to have 0.1 to 5 grams/liter of chloride in the form of the named metal chlorides.
  • metals of main groups I and II whose chloride can be used there may be mentioned sodium, potassium, lithium, rubidium, cesium, magnesium, calcium, strontium and barium.
  • sodium chloride, potassium chloride, lithium chloride, rubidium chloride, cesium chloride, magnesium chloride, calcium chloride, strontium chloride and barium chloride as well as the above-mentioned aluminum chloride and chromium (lll) chloride. It has been found especially advantageous to add either lithium chloride or magnesium chloride.
  • the rhodium coatings can be applied to steel and other metals as well as other substrates conventionally coated with rhodium.
  • An aqueous bath suitable for the electroplating of glossy rhodium coatings said bath containing either (a) 2 to 10 grams/liter of rhodium phosphate and 10 to 40 grams/liter of phosphoric acid or (b) 2 to 10 grams/liter of rhodium sulfate and 20 to 60 grams/liter of sulfuric acid and at least 50 mg/liter of a chloride in the form of a metal chloride or main group II of the periodic system, lithium chloride, aluminum chloride or chromium (lll) chloride.
  • a bath according to claim 1 wherein the amount of chloride is between 0.1 and 5 grams/liter.
  • An aqueous bath according to claim 1 suitable for the electroplating of glossy rhodium coatings said bath containing (1) either 2 to 10 grams/liter of rhodium phosphate and 10 to 40 grams/liter of phosphoric acid or 2 to 10 grams/liter of rhodium sulfate and 20 to 60 grams/liter of sulfuric acid and (2) at least 50 rng/liter of lithium chloride or magnesium chloride.
  • An aqueous bath according to claim 6 containing 2 grams/liter of rhodium as rhodium sulfate, 40 grams/- liter of sulfuric acid and 1 gram/liter of chloride as magnesium chloride.
  • a bath according to claim 1 wherein the chloride is a metal chloride of a main group ll metal.
  • a bath according to claim 1 wherein the chloride is chromium (lll) chloride.
  • a bath according to claim 1 wherein the chloride is aluminum chloride.
  • a bath according to claim 1 wherein the amount of chloride is from 50 mg/liter to 10 grams/liter.

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)
  • Chemically Coating (AREA)
US459370A 1973-06-09 1974-04-09 Electroplating bath for preparation of glossy rhodium coating Expired - Lifetime US3902978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2329578A DE2329578C3 (de) 1973-06-09 1973-06-09 Galvanisches Bad zum Abscheiden glänzender Rhodiumüberzüge

Publications (1)

Publication Number Publication Date
US3902978A true US3902978A (en) 1975-09-02

Family

ID=5883607

Family Applications (1)

Application Number Title Priority Date Filing Date
US459370A Expired - Lifetime US3902978A (en) 1973-06-09 1974-04-09 Electroplating bath for preparation of glossy rhodium coating

Country Status (10)

Country Link
US (1) US3902978A (de)
JP (1) JPS5033125A (de)
BR (1) BR7404724D0 (de)
CH (1) CH593352A5 (de)
DE (1) DE2329578C3 (de)
ES (1) ES425541A1 (de)
FR (1) FR2232618B1 (de)
GB (1) GB1402521A (de)
IT (1) IT1011582B (de)
NL (1) NL7405200A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156721A (en) * 1990-12-03 1992-10-20 Whewell Christopher J Process for extraction and concentration of rhodium
US5522932A (en) * 1993-05-14 1996-06-04 Applied Materials, Inc. Corrosion-resistant apparatus
US5891253A (en) * 1993-05-14 1999-04-06 Applied Materials, Inc. Corrosion resistant apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6324193Y2 (de) * 1980-10-22 1988-07-04
JPS57172816U (de) * 1981-01-22 1982-10-30

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949131A (en) * 1932-11-14 1934-02-27 Thomas P Shields Rhodium plating
US2461933A (en) * 1947-12-24 1949-02-15 Paul T Smith Rhodium alloy coatings and method of making same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE484443A (de) * 1947-08-19

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949131A (en) * 1932-11-14 1934-02-27 Thomas P Shields Rhodium plating
US2461933A (en) * 1947-12-24 1949-02-15 Paul T Smith Rhodium alloy coatings and method of making same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156721A (en) * 1990-12-03 1992-10-20 Whewell Christopher J Process for extraction and concentration of rhodium
US5522932A (en) * 1993-05-14 1996-06-04 Applied Materials, Inc. Corrosion-resistant apparatus
US5593541A (en) * 1993-05-14 1997-01-14 Applied Materials, Inc. Method of manufacturing using corrosion-resistant apparatus comprising rhodium
US5891253A (en) * 1993-05-14 1999-04-06 Applied Materials, Inc. Corrosion resistant apparatus

Also Published As

Publication number Publication date
CH593352A5 (de) 1977-11-30
BR7404724D0 (pt) 1975-09-23
DE2329578B2 (de) 1979-02-22
IT1011582B (it) 1977-02-10
NL7405200A (de) 1974-12-11
AU6959374A (en) 1975-12-04
DE2329578C3 (de) 1981-11-12
ES425541A1 (es) 1976-12-16
FR2232618A1 (de) 1975-01-03
JPS5033125A (de) 1975-03-31
GB1402521A (en) 1975-08-13
DE2329578A1 (de) 1975-01-23
FR2232618B1 (de) 1978-08-04

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