DE69702238D1 - Process and object for coating metals - Google Patents

Process and object for coating metals

Info

Publication number
DE69702238D1
DE69702238D1 DE69702238T DE69702238T DE69702238D1 DE 69702238 D1 DE69702238 D1 DE 69702238D1 DE 69702238 T DE69702238 T DE 69702238T DE 69702238 T DE69702238 T DE 69702238T DE 69702238 D1 DE69702238 D1 DE 69702238D1
Authority
DE
Germany
Prior art keywords
metal
ceramic coating
electric current
maximum height
opposite electrode
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 - Fee Related
Application number
DE69702238T
Other languages
German (de)
Other versions
DE69702238T2 (en
Inventor
Misha Hiterer
Victor Samsonov
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.)
ALMAG AL GIVAT SHAUL
Original Assignee
ALMAG AL GIVAT SHAUL
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 ALMAG AL GIVAT SHAUL filed Critical ALMAG AL GIVAT SHAUL
Application granted granted Critical
Publication of DE69702238D1 publication Critical patent/DE69702238D1/en
Publication of DE69702238T2 publication Critical patent/DE69702238T2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/26—Anodisation of refractory metals 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon

Abstract

The invention provides a process for forming a ceramic coating on a valve metal selected from the group consisting of aluminium, zirconium, titanium, hafnium and alloys of these metals. The process includes immersing the metal as an electrode in an electrolytic bath comprising an aqueous solution of an alkali metal hydroxide, providing an opposite electrode immersed in or containing the electrolyte liquid, passing a modified shaped-wave alternate electric current from a high voltage source of at least 700 V through a surface of the metal to be coated and the opposite electrode, wherein the modified shaped-wave electric current rises from zero to its maximum height and falls to below 40% of its maximum height within less than a quarter of a full alternating cycle, thereby causing dielectric breakdown, heating, melting, and thermal compacting of a hydroxide film formed on the surface of the metal to form and weld a ceramic coating to the metal, and changing the composition of the electrolyte while the ceramic coating is being formed, the change being effected by adding an oxyacid salt of an alkali metal. The invention also provides apparatus for carrying out this method.
DE69702238T 1997-03-11 1997-03-11 Process and object for coating metals Expired - Fee Related DE69702238T2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97301617A EP0867530B1 (en) 1997-03-11 1997-03-11 Process and apparatus for coating metals

Publications (2)

Publication Number Publication Date
DE69702238D1 true DE69702238D1 (en) 2000-07-13
DE69702238T2 DE69702238T2 (en) 2001-01-25

Family

ID=8229243

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69702238T Expired - Fee Related DE69702238T2 (en) 1997-03-11 1997-03-11 Process and object for coating metals

Country Status (3)

Country Link
EP (1) EP0867530B1 (en)
AT (1) ATE193735T1 (en)
DE (1) DE69702238T2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4438609B2 (en) † 2004-11-16 2010-03-24 アイシン精機株式会社 piston
DE102015212325A1 (en) * 2015-07-01 2017-01-05 Bosch Mahle Turbo Systems Gmbh & Co. Kg Method for producing a housing part for a turbine of an exhaust gas turbocharger
DE102015212330A1 (en) * 2015-07-01 2017-01-19 Bosch Mahle Turbo Systems Gmbh & Co. Kg Process for coating an impeller, in particular a turbine wheel and / or compressor wheel, of an exhaust gas turbocharger

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4668347A (en) * 1985-12-05 1987-05-26 The Dow Chemical Company Anticorrosive coated rectifier metals and their alloys
DE4104847A1 (en) * 1991-02-16 1992-08-20 Friebe & Reininghaus Ahc Prodn. of uniform ceramic layers on metal surfaces by spark discharge - partic. used for metal parts of aluminium@, titanium@, tantalum, niobium, zirconium@, magnesium@ and their alloys with large surface areas
DE4139006C3 (en) * 1991-11-27 2003-07-10 Electro Chem Eng Gmbh Process for producing oxide ceramic layers on barrier layer-forming metals and objects produced in this way from aluminum, magnesium, titanium or their alloys with an oxide ceramic layer

Also Published As

Publication number Publication date
EP0867530A1 (en) 1998-09-30
DE69702238T2 (en) 2001-01-25
EP0867530B1 (en) 2000-06-07
ATE193735T1 (en) 2000-06-15

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee