Apparatus for Pretreatment of Metal Strip U.S. fateni5,472,515. Dec. 5, 1995 T.R. Roberts and RF! Metzinger, assignors to Worldsource Coil Coating Inc., Hawesville, Ky

A method for pretreating a metal web comprising moving the metal web along a path; submerging in a solution of pretreat- ing fluid; and projecting the pretreating fluid along the submerged metal web to create a flow counter to the path with a jet.

Galvanized Steel with Darkening Resistance U.S. Patent 5,472,522. Dec. 5, 1995 J. Kawaguchi et a/., assignors to Henkel Corp., Plymouth Meeting, Pa.

A method for imparting an excellent darkening resistance to a conventionally light colored and lustrous galvanized steel surface comprising treating with a phos- phate treatment solution so that zinc phos- phate crystals are formed and deposited on only a fraction that is from 10 to 60% of the total area of the surface, and then conven- tionally treating with a chromating solu- tion.

Phosphate Seal Rinse U.S. Pafenf5,472,523. Dec. 5, 1995 WA. Harelstad, assignor to Frernont lndusfries Inc., Shakopee, Minn.

A method of treating metallic surfaces for increasing corrosion protection of painted products, which includes exposing to a phosphate treatment; exposing to a seal rinse composed of OS-35% morpholine, l-35% 2-benzothiazolylthio succinic acid, and 30-98.5% water and wherein the seal rinse is used in a working solution at a range of 0.1 to 3% by volume at a temper- ature of up to 140°F for a period of at least 5 sec.

Nonchromate Conversion Coating U.S. Patent 5,472,524. Dec. 5, 1995 M./? Schriever, assignor to The Boeing Co., Seattle

A process for forming an oxide film cobalt conversion coating exhibiting corro- sion resistance and paint adhesion proper- ties on a metal substrate, wherein the sub- strate is aluminum, aluminum alloy, magnesium, magnesium alloy, a cadmium- plated substrate, or a zinc-plated substrate,

comprising providing an oxide film form- ing cobalt conversion solution comprising a soluble cobalt-III hexacoordinated com- plex, wherein the cobalt-III hexacoordi- nated complex is present in the form of Me,[Co(NO,),] wherein Me is one or more selected from the group consisting of Na, K, and Li, and the concentration is from about 0.1 mole per gallon of solution to the saturation limit and wherein the aqueous solution has a pH of 7.0 to 7.2; and con- tacting for a sufficient amount of time to oxidize the surface.

Regeneration of Spent Electroless Copper Solution U.S. Patent 5,472,585. Dec. 5, 1995 D. Dine/la et a/., assignors fo AT&T Corp., Murray Hi//, N.J.

A method for deposition of copper on an insulating substrate utilizing an electroless copper plating bath in a plating tank com- prising removing a portion of the bath from the plating tank; adding copper oxide to the portion of the bath in order to replenish copper used up during the plating; subse- quently, transporting the portion of the bath to an electrodialysis apparatus to remove

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102 METAL FINISHING ?? SEPTEMBER 1996