ide, peroxidized acids, and salts thereof; and chlorous and chloric ac- ids as alkaline salts thereof, said oxi- dizing agents being fed to the bath as such or as an aqueous solution thereof.

POWDER COATING APPARATUS U.S. Patent 6,068,702. May 30, 2000 C Bertellotti et al., assignors to Nordson Corp., Westlake, Ohio

A powder coating apparatus capable of converting between at least two different powder coating systems, the apparatus comprising an operating hood having sides generally sur- rounding a powder coating area, with at least one side having an opening to allow the introduction of a part to be coated within the powder coating area; an air circulation system con- nected to the operating hood for draw- ing air from the powder coating area

as the part is coated with powder; and an adjustable air flow regulator oper- atively connected with the air circula- tion system for controlling the draw of air and powder out of the powder coating area between a first draw amount and a second, higher draw amount , wherein the first draw amount allows use of the hood as one powder coating systems and the sec- ond, higher draw amount allows use of the hood as another powder coating system.

ELECTROSTATIC COATING SYSTEM U.S. Patent 6,068,877. May 30, 2000 K. Seitz et al., assignors to Wagner International AG, Alstatten, Switzerland

A method of detecting and coating workpieces in an electrostatic coating system comprising applying a high voltage to an electrode of at least one electrostatic coating device, in which

a spray current containing electrical charges for charging particles of a coating material to be sprayed is gen- erated by the electrode; passing an electrically conductive workpiece to be coated by the at least one coating device; determining the spray current of the high voltage electrode; detect- ing whether the workpiece is in front of the at least one coating device de- pending on the magnitude of the de- termined spray current; starting a dis- charge of the coating material by the at least one coating device when the spray current exceeds a first threshold value of spray current; and stopping the discharge of coating material by the at least one coating device when the spray current falls below a second threshold value of spray current.

POWDER COATING SYSTEM U.S. Patent 6,071,348. June 6, 2000

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170 Metal Finishing

K. Sei tz et al., assignors to Wagner Internat ional AG, Alstat ten, Swi t zer land

An electrostatic powder coating sys- tem comprising at least one coating device for delivering an electrostati- cally charged coating powder to a workpiece, a coating compar tment through which the workpiece is fed,

and a suction system for sucking off excess coating powder from the coat- ing compartment, characterized by a measuring means for determining the powder mass flow of the coating pow- der delivered by each of the at least one coating device, and an actuator means for setting the suction system in response to the powder mass flow.

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RACKING FIXTURE U.S. Patent 6,071,385. June 6, 2000 E.R. Long, assignor to The Boeing Company, Seattle, Wash.

A racking fixture for holding compo- nents while they are electrochemi- cally processed comprising a plurality of bus bars for supplying electrical current to the components, a shelf for holding the components and electri- cally connected to at least one of the plurality of bus bars; and a drive as- sembly electrically powdered by the plurality of bus bars and mechani- cally engaged with the shelf to agitate the shelf to remove gases trapped in the component.

C O M P O S m O N FOR TREATING A ZINCUFEROUS SURFACE U.S. Patent 6,071,435. June 6, 2000 S. Komiyama et al., assignors to Henkel Corp., Gulph Mills, Pa.

An aqueous liquid composition for t reat ing the surface of zinciferous metal having a pH not exceeding 2.5 and consisting essentially of water and ions containing hexavalent chro- mium, t r i v a l e n t ch romium ions, nickel ions, phosphoric acid, and a water-based emulsified resin.

VENICLE POWDER COATING SYSTEM U.S. Patent 6,071,558. June 6, 2000 J.R. Shutic, assignor to Nordson Corp., Westlake, Ohio

A method of applying powder coating material onto objects moving through a powder spraybooth comprising us- ing negative pressure in a powder col- lection housing to t ransmit powder coating material through a transfer line connected between a p r imary hopper containing the powder coating material and the powder collection housing; t ransmitt ing powder coating material from the powder collection housing to a second hopper; and transmitt ing powder coating material from the second hopper to at least one powder spray device associated with the powder spraybooth.

CONVERSION COATING OF A L U M I N U M U.S. Patent 6,074,495. June 13, 2000 Y. Sung and C.L. Chang, assignors to Chung Shan Institute of Science & Technology, Taoyuan, Taiwan

A method for treating aluminum to

June 2001 171