Electrochemical Roughening Process U.S. Patent 5,667,666. Sept. 16, 1997 A. Mafsuura and A. Uesugi, assignors to Fuji Pbofo film Co. Ltd., Kanagawa, Japan

A process for roughening a surface of a metal web comprising alternately applying. from one terminal of a power source. a positive current and a negative current to a plurality of electrodes spaced apart from adjacent electrodes by a pause section; sub- jecting the metal web to electrochemical processing in an electrolyte by an electric current formed between the metal web and the plurality of electrodes facing the metal web; and pausing the electrochemical pro- cessing at the pause section between two of the electrodes for I to 30 sec.

Coated Abrasive U.S. Patent 5667,842. Sepf. 16, 1997 E.G. Larson et al., assignors to 3M Co., St Paul, Minn.

Abrasive articles incorporating addition polymerirable resins and reactive diluents.

Pretreating Zinciferous Surfaces U.S. Pafenf 5,667,843. Sept 16, 1997 N. Yoshifake et a/., assignors to Henkel Corp., Plymouth Meeting, Pa.

A process for treating a zinciferous sur- face comprising coating with a film of an aqueous liquid pretreatment composition consisting essentially of water; cations se- lected from the group consisting of cobalt, nickel. or both: anions containing hexava- lent chromium; and sufficient anions to balance the charge of the cations present and. optionally. complexing agents for co- balt and nickel cations: and. optionally. divalent lead cations, trivalent iron cations. or both; said composition being substan- tially free from chloride ions; drying into place: and applying a chromate coating, wherein the total mass of cobalt and nickel added to the zinciferous surface being in the range from 0.5 to 100 mg/m’.

Tool Treating Process U.S. Patent 5667,844. Sept. 16, 1997 M.R. Smifh and J.L. Maassel, assignors to Macro Specialty Industries Inc.. Napoleon, Ohio

A process for treating a cutting tool comprising placing the tool to be treated into a first bath of solvent: heating the bath of solvent to remove contaminant from the surfaces of the tool within the bath of so- vent: placing the tool in a second bath of a pertluoroethylene resin: circulating the sec- ond bath of perfluoroethylene resin for a time sufficient to coat the surfaces of the tool with perfluoroethylene resin; and re- moving the tool from the second bath to permit the tool to return to ambient tem- perature.

Circle 093 on reader information card

Electroplating of Zinc DiecasUgs by SK. Jalota 225 pages $90.00

This book provides a qu.ite exhaustive coverage of plating on zinc die castings start- ing with design and production with emphasis on its relation to plating. Subsequent chapters treat polishing, buffing and mass finishing, cleaning and pretreatment, and the equipment for plating. The balance of the book runs the gamut of the various metals that can be deposited. Each chapter devotes a portion to troubleshooting, causes of defects, and remedies. Concluding chapters concern coloring, lacquering, stripping of deposits, and analysis and testing.

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METAL FINISHING l MAY 1998 85