Method for manufacturing products

Abstract

Method of coating products, such as workpieces, in particular made from valve metals and their alloys, by micro-arc oxidation or electrophoresis in the presence of at least one additive incorporated in an alkaline solution, characterised in that before applying the coating, a nozzle element is mounted at a distance of 5-15 mm from the zone of the surface of the workpiece to be processed, the nozzle cross section being selected depending on the geometry of the part of the workpiece surface to be processed, and, when the alkaline solution is delivered through the nozzle element, an electric circuit is established cathode to anode by the uninterrupted and forcibly and selectively directed and/or automatically ejected jet of solution in order to avoid additional cooling of the workpiece and to ensure that the coating is fused through its entire depth, and the powdered components or the ultra-dispersion powder needed for the chemical composition may be used as additives.

1 . Method of coating products, such as workpieces, in particular made from valve metals and their alloys, by micro-arc oxidation or electrophoresis in the presence of at least one additive incorporated in an alkaline solution, characterised in that before applying the coating, a nozzle element is mounted at a distance of 5-15 mm from the zone of the surface of the workpiece to be processed, the nozzle cross section being selected depending on the geometry of the part of the workpiece surface to be processed, and, when the alkaline solution is delivered through the nozzle element, an electric circuit is established cathode to anode by the uninterrupted and forcibly and selectively directed and/or automatically ejected jet of solution in order to avoid additional cooling of the workpiece and to ensure that the coating is fused through its entire depth, and the powdered components or the ultra-dispersion powder needed for the chemical composition may be used as additives.  
     
     
         2 . Method as claimed in  claim 1 , characterised in that, when individual regions of the workpieces are temporarily insulated, the nozzle element is displaced at a speed of not more than 25 mm/min consistently along the entire surface of the workpiece to be processed which has a complicated configuration.  
     
     
         3 . Method as claimed in  claim 1  or  2 , characterised in that Al, Ti are used as valve metals and, as their alloys, duraluminum 1, duraluminum 16hard, aluminium magnesium, AlMn (aluminium manganese) alloys on a titanium base and AlV (aluminium vanadium) alloys on a titanium base.  
     
     
         4 . Method as claimed in one or more of the preceding claims, characterised in that Al, Ti, Al 2 O 3 m TiO 2 , aluminium alum are used as the powdered components and Al, Ti and Mg are used as the ultra-dispersion powder.  
     
     
         5 . Method as claimed in one or more of the preceding claims, characterised in that the product is provided with a conductive layer, in particular in those surface regions across which the nozzle passes.