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Z.O.G Seminar on the electroless deposition of bondable and solderable precious metal coatings

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Report on a German seminar where various coatings for printed circuit boards are discussed including ENAG (ENIG) electroless nickel, immersion gold, ENEPIG, electroless nickel, electroless palladium, immersion gold and other variants of a similar type such as EPIG.. Instrumental techniques for characterising such deposits including SEM, Focused ion beam, pull-off and shear testing for wirebonding measurements. Erroneous results due to incorrect pull-off testing methodology are noted with both the height and the angle of the loop being critical. www.zog.de

Zeolite coatable metallic foil

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Zeolite coated metallic layer comprises steel foil containing chromium and/or aluminium covered with finely grained Al oxide layer, with slight proportions of Cr oxide and iron oxide, having mean roughness 2-4µm and averaged peak-to-valley height ca. 0.2 µm; ceramic washcoat bonding layer on oxide layer; and zeolite layer.

Zeolite particle-containing polymer and its production.

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The titled polymer having a bactericidal action, undergoing little change in properties, and being applicable to a wide variety of polymers, comprising an organic polymer and solid zeolite particles carrying bactericidal metallic ions. A zeolite particle-containing polymer comprising solid zeolite particles (those comprising A-, X-, or Y-zeolite or mordenite having a specific surface area >=150m<2>/g and an SiO2/Al2O3 molar ratio <=14) and an organic polymer (e.g., PE, PP, or PVA), wherein at least part of said solid zeolite particles carry bactericidal metallic ions (silver, copper, or zinc). When used in a liquid containing various metals or in water, ions Ag<+>, Cu<2+>, or Zn<2+> are held stably in the zeolite matrix for a long time and the bactericidal action can be sustained over a long period.

Zeolite sol and method for preparing the same, composition for forming porous film, porous film and method for forming the same, interlevel insulator film, and semiconductor device.

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Hydrolysis & decomposition of a silane type cmpd to form a film which can then be thinned as desired.

Zero Air Emissions for Hard Chromium Plating Applications: An Alternative Emission Control Technology

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Use of tank covers with membranes was described, noting their performance met environmental & Health & Safety guidelines, and offered a 12-18 month payback time

Zero cadmium emission

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Nil Cd in effluent is achieved by recirculating rinse water. Eluates and concentrates containing Cd are separated into part-streams and Cd is removed by use of selective anion or cation exchange resins. Eluates are concentrated in vacuum evaporator and Cd can be electrodeposited with good cathode efficiencies. Low concn Cd soln is returned to concentrate treatment.

Zero Charge Potentials of Electrodes

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Proceedings of lecture (in Engl.) describes concepts of pzc, experimental meas't, e.g by electrocapillary maxima or differential capacity. PZC-related phenomena include harness &coefficient of friction, electrical contact vs. applied force. Tables list pzc's for various metals & correlation between pzc & electronic work function is drawn. Comments on electrode reactions & Tafel behaviour for model Faradaic reactions. 95 refs

Zero charge potentials of platinum metals and electron work functions (Review).

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RUS

Zero Chromium Electrolytic Surface Treatment for Metallic Surfaces

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Cathodic mineralization is a proprietary electrolytic process, similar to electrogalvanising, operated by immersing a metallic (or an electrically conductive) component within an electrolyte containing aqueous silicate solution. The electrolyte can be modified by adding water-soluble dopants. A current is passed through the electrolyte such that the component is employed as the cathode. Under these conditions, the component/cathode interacts or reacts with the electrolyte to form a "mineral-like" layer. This layer is so thin that it will not affect the dimensions of tolerance-sensitive parts. The layer can replace chromating, as well as phosphating, for steel, stainless steel, electro- or mechanically plated zinc, zinc/aluminum alloys and other metal or metallized parts.

Zero Chromium Electrolytic Surface Treatment for Metallic Surfaces. Pt 1.

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CM (cathodic mineralisation) is proprietary electrolytic process in which substrate is electrolysed in aq. silicate sol'n. Under cathodic action, a mineralised layer forms on surface which is so thin that dimensional tolerances are scarcely affected. Process is alternative to chromating, phosphating & other such conversion coatings and can be used for stainless steel, zinc (however deposited), aluminium & other surfaces. Graphs show iron anodes in deionised water and for platinised titanium anodes in DI water. Photos & data show title processed fasteners etc with additional chromate coating.

Zero chromium electrolytic treatment of metallic surfaces. Pt 2. aluminium & alloys

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Corrosion resistant coating based on silicates is reported known as Elisha Chromium Mineral Coating (ECMC) which is so thin that normal tolerances remain unaffected. The coating contains no hexavalent chromium, no strontium and is VOC free. Abstr. only.

Zero defects in French plating plant

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Visit to Messrs Ludmann in Lorraine with photos of plant, computer control panels, comments on effluent treatment, evaporators and how these were selected, ventilation & exhaust

Zero defects or ?

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Introduces an alphabet soup of quality control or assurance techniques incl. Kaizen or lean six sigma and shows how title concept is applied to a metal finishing process. A fishbone diagram shows inputs & outcome. Concepts discussed incl. Pareto plot, design of experiments, Main Effects plot, Robust Design. Table ranks a wide range of quality methods, process simulation & other. 15 refs

Zero discharge - report on a research project

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Report on progress in title project with specific discussions on alkaline degreasing baths, post-degreasing rinse tanks, acid pickling & etching & associated rinses, rinses from cyanide zinc, chromate baths & rinses from these. Idealised flowsheets are shown, ultrafiltration & electrodialysis are largely employed.

Zero discharge chemical paint stripping

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Report on chemical stripper system (Ketol) for reworking in house of defective components. Investment & cost data (ferrous & non-ferrous components) are given. Process flow sheet is shown.