Global patent index - EP 0867530 B1

EP 0867530 B1 2000-06-07 - Process and apparatus for coating metals

Title (en)

Process and apparatus for coating metals

Title (de)

Verfahren und Gegenstand für die Beschichtung von Metallen

Title (fr)

Procédé and dispositif pour le revêtement des métaux

Publication

EP 0867530 B1 (EN)

Application

EP 97301617 A

Priority

EP 97301617 A

Abstract (en)

[origin: EP0867530A1] 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.

IPC 1-7 (main, further and additional classification)

C25D 11/04; C25D 11/26

IPC 8 full level (invention and additional information)

C25D 11/04 (2006.01); C25D 11/26 (2006.01)

CPC (invention and additional information)

C25D 11/26 (2013.01); C25D 11/04 (2013.01)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0867530 A1 19980930; EP 0867530 B1 20000607; AT 193735 T 20000615; DE 69702238 D1 20000713; DE 69702238 T2 20010125

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