GB1065825A - Protection of metal surfaces - Google Patents

Protection of metal surfaces

Info

Publication number
GB1065825A
GB1065825A GB1794063A GB1794063A GB1065825A GB 1065825 A GB1065825 A GB 1065825A GB 1794063 A GB1794063 A GB 1794063A GB 1794063 A GB1794063 A GB 1794063A GB 1065825 A GB1065825 A GB 1065825A
Authority
GB
United Kingdom
Prior art keywords
acid
alkaline
mins
metal phosphate
solution
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
GB1794063A
Inventor
William Graeme Livingst Miller
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.)
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Motor Co Ltd
Ford Motor Co
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 Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Motor Co Ltd
Priority to GB1794063A priority Critical patent/GB1065825A/en
Publication of GB1065825A publication Critical patent/GB1065825A/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
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
    • C25D5/44—Aluminium
    • 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
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated

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 method of protecting metal surfaces liable to chemical attack by an electrodeposition bath containing nickel salts or chromium salts prior to electrodepositing nickel and/or chromium upon them, in which the cleaned surface is both alkaline-etched and acid dipped and subsequently immersed in an acid 'coating' metal phosphate solution to form a thin electrically conductive adherent deposit of metal phosphate. The alkaline etching is preferably followed by the acid dipping, and the surface may undergo these two treatments more than once. The surface is preferably first polished, degreased and cleaned with an alkaline cleaning solution containing 1/2 -6ozs alkali per gallon by immersion therein for 1-10 mins. at 90 DEG -210 DEG F. The alkaline etching solution may contain 2-10ozs/gall of a mixture of alkaline salt of sodium and potassium, the surface being etched therein for 15 secs. to 2 mins. at 120-180 DEG F. The acid may contain between 5% v/v and 30% v/v of nitric acid, and the surface is dipped therein for 15 secs. to 2 mins. at ambient temperature. The acid coating metal phosphate solution is preferably a nitrite-accelerated zinc phosphate solution of acid content between 0.5% and 6.0%. The surface is preferably rinsed between each stage of the invention.
GB1794063A 1963-05-07 1963-05-07 Protection of metal surfaces Expired GB1065825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1794063A GB1065825A (en) 1963-05-07 1963-05-07 Protection of metal surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1794063A GB1065825A (en) 1963-05-07 1963-05-07 Protection of metal surfaces

Publications (1)

Publication Number Publication Date
GB1065825A true GB1065825A (en) 1967-04-19

Family

ID=10103910

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1794063A Expired GB1065825A (en) 1963-05-07 1963-05-07 Protection of metal surfaces

Country Status (1)

Country Link
GB (1) GB1065825A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149427A (en) * 1983-11-09 1985-06-12 Nippon Paint Co Ltd Surface treatment of aluminum materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149427A (en) * 1983-11-09 1985-06-12 Nippon Paint Co Ltd Surface treatment of aluminum materials

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