CH559253A5 - Aluminium anodising plant - using positive and negative current pulses in turn in specified proportions - Google Patents

Aluminium anodising plant - using positive and negative current pulses in turn in specified proportions

Info

Publication number
CH559253A5
CH559253A5 CH1328671A CH1328671A CH559253A5 CH 559253 A5 CH559253 A5 CH 559253A5 CH 1328671 A CH1328671 A CH 1328671A CH 1328671 A CH1328671 A CH 1328671A CH 559253 A5 CH559253 A5 CH 559253A5
Authority
CH
Switzerland
Prior art keywords
positive
current
aluminium
anodising
turn
Prior art date
Application number
CH1328671A
Original Assignee
Scionics Corp
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 Scionics Corp filed Critical Scionics Corp
Priority to CH1328671A priority Critical patent/CH559253A5/en
Publication of CH559253A5 publication Critical patent/CH559253A5/en

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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/024—Anodisation under pulsed or modulated current or potential

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 polyphase galvanising plant for anodising workpieces made of aluminium or an aluminium alloy uses negative as well as positive current pulses in turn, after a polyphase mains supply current has been transformed to a current with a higher number of phases. The supplies are so adjusted that the ratio of average negative current to the average positive current lies between 3% and 20%. The frequency of these positive and negative pulses is held between 2 and 20 pulses per sec. This produces thick, high-quality and hard coatings which are easy to paint. The set values are automatically maintained when the voltages or resistances fluctuate. The full current density can be applied from the start without risk of burn marks. The galvanising throughput is high.
CH1328671A 1971-09-10 1971-09-10 Aluminium anodising plant - using positive and negative current pulses in turn in specified proportions CH559253A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH1328671A CH559253A5 (en) 1971-09-10 1971-09-10 Aluminium anodising plant - using positive and negative current pulses in turn in specified proportions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1328671A CH559253A5 (en) 1971-09-10 1971-09-10 Aluminium anodising plant - using positive and negative current pulses in turn in specified proportions

Publications (1)

Publication Number Publication Date
CH559253A5 true CH559253A5 (en) 1975-02-28

Family

ID=4391069

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1328671A CH559253A5 (en) 1971-09-10 1971-09-10 Aluminium anodising plant - using positive and negative current pulses in turn in specified proportions

Country Status (1)

Country Link
CH (1) CH559253A5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132226A1 (en) * 1983-07-14 1985-01-23 Schweizerische Aluminium Ag Process for the continuous pretreatment of an aluminium ribbon or foil by electrochemical oxidation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132226A1 (en) * 1983-07-14 1985-01-23 Schweizerische Aluminium Ag Process for the continuous pretreatment of an aluminium ribbon or foil by electrochemical oxidation

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Legal Events

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