medium wherein the surface is employed as a cathode and an anode comprises at least one member selected from the group consisting of platinum, niobium, titanium, and alloys thereof; pass- ing a current through the surface and medium at a rate and period of time sufficient to form a layer upon the surface that imparts improved corrosion resistance to the surface.

STRIPPING SOLDER AND TIN US. Patent 6,258,294. July 10, 2001 ‘1: Johnson, II and JT Fakler, assig- nors to Morton International Inc., Chicago A tin or solder stripping composi- tion for providing a printed cir- cuit board with improved insula- tion resistance consisting

essentially of 5 to 50% by volume of 69% nitric acid aqueous solu- tion; 1 to 50% by volume of 45% ferric nitrate aqueous solution; 0.1 to 10% by weight of at least one fluoride ion added to the stripping solution to provide an increase in insulation resistance of the printed circuit, the fluoride ion being selected from the group consisting of sodium fluoride, sodium bifluoride, potassium fluo- ride, and potassium bifluoride and mixtures thereof.

IRON-PLATED ALUMINUM ALLOY PAGTS US. Patent 6,258,415. July lo,2001 S. !!‘roup-Packman, assignor to Hughes Electronics Corp., El Segundo, Calif A process for plating aluminum

alloy substrates with iron consist- ing of the following steps, each step followed by a water rinse; treating with a zincate bath to deposit an immersion layer of zinc metal thereon; plating a layer of nickel from an electroless nickel bath; electroplating a layer of iron from an iron sulfate bath; and electroplating on the iron layer a layer of tin from an alka- line tin bath.

APPARATUS FOR MEDlA FINISHING US. Patent 6,261,154. July 17,200l J W McEnegy, Charlotte, N. C, An apparatus for finishing the surfaces of workpieces and that is particularly suitable for polishing the surfaces of metal workpieces comprising a toroidal tub; finish- ing media in the toroidal tub;

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56 Metal Finishing