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coating waste
ing the directionality or anisotropy of a surface and for making the surface specular on a substrate material consisting of aluminum or an aluminum alloy, which comprises chemically etching the substrate material; subjecting the etched substrate material to electrochemical polishing by using a solution; and subjecting the substrate material to a new chemical etching and electrochemical polishing, wherein the substrate of the substrate material is not exposed to air between the etching and the electrochemical polishing. AIRFOIL
STRIPPING
SYSTEM
US. Patent 6,428,683. Aug. 6,2002 M.R. Jaworowski, et al., assignors to United Technologies Corp., Hartford, Ct.
A coating removal system comprising a stripping tank containing an electrolyte bath for remov-
ing a coating from at least one workpiece while a controlled absolute electrical potential is maintained; a rinse tank; and a distillation unit for receiving electrolyte from the stripping tank containing dissolved metals, and returning the electrolyte in a purified form to the stripping tank.
2003
RECYCLING COATING
ETCHING SELECTIVELY
PROCESS REMOVE
TO COPPER
US. Patent 6,428,719. Aug. 6,2002 X. Wu, et al, assignors to Headway Technologies Inc., Milipitas, Calif:
A process for etching copper in the presence of nickel-iron comprising providing a body of nickel iron and a layer of copper in the vicinity of the nickel-iron such that there is contact between the copper and the nickel-iron; and immersing the layer of copper and the body of nickel-iron in an aque-
Circle September
ous etching solution of ammonium persulfate, at a first concentration, to which has been added 1,4,8,11 tetraazundecane at a second concentration, whereby the copper layer is removed and the nickel-iron is unaffected.
046 on reader
POWDER
/
WASTE
US. Patent 6,428,843. Aug. 6,2002 R. Graewe and A. Rettig, assignors E.I. du Pont de Nemours & Co., Wilmington, Del.
to
A process for recycling polymeric powder coating wastes comprising intimately contacting the powder coating wastes with polymeric powder coating chips to that are at least partially covered with the powder coating wastes; and bonding the powder coating wastes to the powder coating chips by heating.
information
card or go to www.thru.to/webconnect 73
STRIPPING
SYSTEM
US. Patent 6,428,683. Aug. 6,2002 M.R. Jaworowski, et al., assignors to United Technologies Corp., Hartford, Ct.
A coating removal system comprising a stripping tank containing an electrolyte bath for remov-
ing a coating from at least one workpiece while a controlled absolute electrical potential is maintained; a rinse tank; and a distillation unit for receiving electrolyte from the stripping tank containing dissolved metals, and returning the electrolyte in a purified form to the stripping tank.
2003
RECYCLING COATING
ETCHING SELECTIVELY
PROCESS REMOVE
TO COPPER
US. Patent 6,428,719. Aug. 6,2002 X. Wu, et al, assignors to Headway Technologies Inc., Milipitas, Calif:
A process for etching copper in the presence of nickel-iron comprising providing a body of nickel iron and a layer of copper in the vicinity of the nickel-iron such that there is contact between the copper and the nickel-iron; and immersing the layer of copper and the body of nickel-iron in an aque-
Circle September
ous etching solution of ammonium persulfate, at a first concentration, to which has been added 1,4,8,11 tetraazundecane at a second concentration, whereby the copper layer is removed and the nickel-iron is unaffected.
046 on reader
POWDER
/
WASTE
US. Patent 6,428,843. Aug. 6,2002 R. Graewe and A. Rettig, assignors E.I. du Pont de Nemours & Co., Wilmington, Del.
to
A process for recycling polymeric powder coating wastes comprising intimately contacting the powder coating wastes with polymeric powder coating chips to that are at least partially covered with the powder coating wastes; and bonding the powder coating wastes to the powder coating chips by heating.
information
card or go to www.thru.to/webconnect 73