Global Patent Index - EP 1570100 A1

EP 1570100 A1 20050907 - METHOD FOR THE CONSERVATION OF METAL SURFACES

Title (en)

METHOD FOR THE CONSERVATION OF METAL SURFACES

Title (de)

VERFAHREN ZUR KONSERVIERUNG VON METALLOBERFLÄCHEN

Title (fr)

PROCEDE DE CONSERVATION DE SURFACES METALLIQUES

Publication

EP 1570100 A1 20050907 (DE)

Application

EP 03812556 A 20031203

Priority

  • DE 0303991 W 20031203
  • DE 10257344 A 20021206

Abstract (en)

[origin: WO2004053185A1] Disclosed is a method for the conservation of metal surfaces (10a) by means of plasma treatment in a CO2 containing and/or N2- containing reactive gas atmosphere, wherein the metal surfaces (10a) are preferably exposed to a dielectric barrier discharge (DBE) at atmospheric pressure. Ignition occurs with a high-frequency alternating current of typically approximately 1-10 kV between a discharge electrode (14) and a counter electrode (10), whereby at least one thereof is insulated dielectrically in relation to the discharge chamber (16) formed therebetween by means of a suitable dielectric (14a) such as, for instance glass or ceramic material. Preferably, the metal surface (10a) to be treated is earthed and used as a counter electrode (10) for at least one discharge electrode (14) which is embodied as a form electrode which reproduces the surface contours in a plane-parallel manner. The dielectric barrier discharge cannot, however, also be performed between plane-parallel electrodes whereby at least one of which is electrically insulated. According to the invention, an indirect dielectric barrier discharge can also be used, whereby the discharges (20) are carried out in an adjacent position in relation to the metal surface (10a) and whereby the respectively used inflowing reactive gas, is brought into contact therewith by means of plasma jets, for example. The above-mentioned method is particulary suitable for continuous or quasi-continuous conservation of metal strips (10), cut strips, circuit boards or succesively arranged individual parts.

IPC 1-7

C23C 8/36; B08B 7/00; C23C 8/16; C23C 8/24; C23C 8/28

IPC 8 full level

B08B 7/00 (2006.01); C23C 8/28 (2006.01); C23C 8/36 (2006.01); C23G 5/00 (2006.01)

CPC (source: EP)

B08B 7/0035 (2013.01); C23C 8/28 (2013.01); C23C 8/36 (2013.01); C23G 5/00 (2013.01)

Citation (search report)

See references of WO 2004053185A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

WO 2004053185 A1 20040624; AU 2003296518 A1 20040630; DE 10257344 A1 20040708; EP 1570100 A1 20050907

DOCDB simple family (application)

DE 0303991 W 20031203; AU 2003296518 A 20031203; DE 10257344 A 20021206; EP 03812556 A 20031203