GB1082695A - Improvements in the electroplating of precious metals on to articles made of baser metals - Google Patents

Improvements in the electroplating of precious metals on to articles made of baser metals

Info

Publication number
GB1082695A
GB1082695A GB34335/64A GB3433564A GB1082695A GB 1082695 A GB1082695 A GB 1082695A GB 34335/64 A GB34335/64 A GB 34335/64A GB 3433564 A GB3433564 A GB 3433564A GB 1082695 A GB1082695 A GB 1082695A
Authority
GB
United Kingdom
Prior art keywords
acid
chromium
gold
coating
nickel
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
Application number
GB34335/64A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB34335/64A priority Critical patent/GB1082695A/en
Publication of GB1082695A publication Critical patent/GB1082695A/en
Expired 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
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/625—Discontinuous layers, e.g. microcracked layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C25D5/611—Smooth layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/623—Porosity of the layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance

Landscapes

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

Abstract

A tarnish- and corrosion-resistant coating is provided by a layer of chromium with a coating of a precious metal supported on the chromium layer and adhered to a depassivated surface thereof. The chromium coating may be depassivated by subjecting it to a cathodizing current in an acid bath, e.g. it may be treated in 5%-10% hydrochloric acid or sulphuric acid at room temperature for 5-30 minutes with a cathode current of 30-40 amps/square foot. Phosphoric and acetic acids may also be used for depassivation. The surface is then rinsed in a weak acid bath, e.g. 0.01-1% hydrochloric or sulphuric acid and then electro-plated with the precious metal which may be gold, platinum, palladium or rhodium. Specific acid gold cyanide bath compositions are referred to for plating with gold. These baths may also contain salts of base metals such as iron, nickel, cobalt, tin, cadmium or zinc to produce a gold alloy coat. For plating the platinum group metal baths may be prepared from iodo complexes containing excess of iodides of alkali metals, ammonium or magnesium, repassivation of the chromium by liberated iodine being avoided by placing the anode in a porous compartment of unglazed porcelain or fritted glass, using acid or alkaline anolytes. The substrate may be coated first with copper, then with nickel, an adherent chromium coating being applied to the nickel surface.
GB34335/64A 1966-10-13 1966-10-13 Improvements in the electroplating of precious metals on to articles made of baser metals Expired GB1082695A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB34335/64A GB1082695A (en) 1966-10-13 1966-10-13 Improvements in the electroplating of precious metals on to articles made of baser metals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB34335/64A GB1082695A (en) 1966-10-13 1966-10-13 Improvements in the electroplating of precious metals on to articles made of baser metals

Publications (1)

Publication Number Publication Date
GB1082695A true GB1082695A (en) 1967-09-06

Family

ID=10364366

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34335/64A Expired GB1082695A (en) 1966-10-13 1966-10-13 Improvements in the electroplating of precious metals on to articles made of baser metals

Country Status (1)

Country Link
GB (1) GB1082695A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2115056A1 (en) * 1970-11-26 1972-07-07 Woods Roger Gold plating - of chromium surfaces by activation acid treatment plating and heat treatment
GB2130602A (en) * 1982-11-24 1984-06-06 Stc Plc Electroplating electrical contacts
WO2001057932A1 (en) * 2000-02-07 2001-08-09 Cis Solartechnik Gmbh Flexible metal substrate for cis solar cells, and method for producing the same
US6312580B1 (en) * 1998-11-02 2001-11-06 Tivian Industries, Ltd. Method for gold plating chromium and other passive metals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2115056A1 (en) * 1970-11-26 1972-07-07 Woods Roger Gold plating - of chromium surfaces by activation acid treatment plating and heat treatment
GB2130602A (en) * 1982-11-24 1984-06-06 Stc Plc Electroplating electrical contacts
US6312580B1 (en) * 1998-11-02 2001-11-06 Tivian Industries, Ltd. Method for gold plating chromium and other passive metals
WO2001057932A1 (en) * 2000-02-07 2001-08-09 Cis Solartechnik Gmbh Flexible metal substrate for cis solar cells, and method for producing the same

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