New Developments in the Metal Finishing Field Compiled by Anselm Kuhn, Metal Finishing Information Services Ltd.

Recently published patents

M e t h o d s a n d A p p a r a t u s fo r

P r o d u c t i o n o f C o m p o s i t e -

C o a t e d R ig id F l a t - R o l l e d S h e e t

M e t a l S u b s t r a t e

WO 2004101839 (Weirton Steel Corp.) Sinsel, J.A.; Loen, M.A., et al. Methods and apparatus for pro- ducing composite-coated rigid flat-rolled sheet metal substrate in which thermoplastic polymer- ic materials are selected and combined for dual-layer molten- film extrusion presenting a first- contracting tie-layer and an externally located finish layer, which are simultaneously

extruded for one single substrate surface at a time, in which the tie layer selection includes an ethylene-glycol modified PET, requiring a substrate-surface temperature between 230°F and 300°F, and a maleic-anhydride modified polyethylene free of any substrate surface heating requirement. The tie layer pro- vides sufficient green strength adhesion for a finish layer select- ed from PBT, PET, and a combi- nation of PBT and PET. Each substrate surface is separately activated for desired adhesion and separately polymeric coated. Dual-surface finishing process- ing is carried out by remelting

the coated polymeric materials for completing bonding of the dual polymeric layers on each inorganic metallic protectively coated surface of the substrate.

O z o n e P o s t - D e p o s i t i o n T r e a t m e n t to R e m o v e C a r b o n

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WO 2004102651 (Micron Tech Inc). Sandhu, G.S.; Li, L. Method of removing residual car- bon deposits from a flowable, insulative material, which com- prises silicon, carbon, and hydro- gen and is a flowable oxide mate- rial or a spin-on, flowable oxide material. The residual carbon

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Chromic Acid:Rake =Chromic Acid Crystal

Fume Suppressants Brighteners

Testing and Support

C o b a l t C o p p e r Brass B r o n z e

Nicke l Crowns and Rounds Z inc Tin Rec*angtes a ~ OvaLs M O R E Stars, l n g ~ and Shot

C u s t o m A l loys C u s t o m A n o d e s

C u s t o m B a s k e t s C u s t o m B lends

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deposits are removed from the flowable, insula t ive mater ia l by exposing the mater ia l to ozone. The mater ial is used to form an insulative layer in a trench locat- ed on a semiconductor substrate.

Coated Ar t i c l e w i t h N iob ium Z i rcon ium Inc lus ive Layer(s) and M e t h o d of M a k i n g Same WO 2004101937 (Guardian Ind.) Stachowiak, G. Coating of NbZr, its oxide, or nitride for use as low-E coating on glass, etc.

Wear Ind ica tor for Sacri f ic ia l A n o d e WO 2004101851 (Performance Metals Inc.) Wigg, M.; Leipert, H., et al. Apparatus for indicating when a predetermined portion of a sacrifi- cial anode has been corroded com-

prises a detector embedded within the interior of the sacrificial anode initially at a predetermined dis- tance from an exposed exterior sur- face of the anode. The detector detects the absence of sacrificial anode material when the predeter- mined portion has corroded and generates a detection signal. A monitoring system communicates with the detector and generates an indicator signal when a detection signal is received.

Poly te t ra f luoroe thy lene D ispers ion for E lectro less N icke l P lat ing App l ica t ions WO 2004101848 (MacDermid Inc.) Crotty, D.; Bengston, J. A low-viscosity silicone glycol sur- factant together with glycerin is added to a polytetraf luoroethyl- ene dispersion for use with an electroless nickel plat ing bath.

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The improved plat ing ba th pro- duces a s table PTFE dispersion tha t continues to work as the plat ing ba th ages and produces an electroless nickel deposit with grea ter than 20 percent by vol- ume of PTFE in the deposit.

A q u e o u s A lka l ine Z incate So lu t ions and M e t h o d s WO 2004101854 (Atotech Deutschland GmbH) Joshi, N.H.; Mehta, M.D. Aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions, and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more ni t rogen atoms, sulfur atoms, or both nitrogen and sul- fur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxy- lamine. Also, methods for deposit-

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May 2005 105