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'A metal finisher's perspective' on industry water pollution/RCRA regulations
Discusses impending EPA regulations, with special reference to 'total toxic organics' (TTO) limit of 0.58 ppm which is considered to be too stringent. Alternative systems of enforcement are discussed.
'Bad press'... every finishers' problem
Text of letter to press in response to information on hazardous disposal sites.
'Black' electroless nickel coating
'Burattura' pretreatment technology
Describes vibratory finishing machine.
'Chemelec' leads to major savings in silver at Kaynar (UK) Ltd.
Description of Ag recovery from plating effluent using 'Chemelec' cell of BEWT (Water Engineers) Ltd.
'Cleanability' of interior coatings.
It is noted that the ability for interior coatings be be wiped clean is important to consumers, and that therefore coating manufacturers invest a great deal of effort into improving the scrub properties of interior coatings. Tests for the cleanability of coatings are described, which use beetroot juice, coffee, black tea, mustard, ketchup and red wine. Red lipstick is also used as a testing substance.
'Cold' degreasing, an industrial process at Visseries et Boulonneries at Fourmies
Use of room temp. cleaning soln. before Zn plating, using 'Steel Klin Lt' of Societe Pascalis is described. Savings of 70,000 FF p.a. are claimed.
'Crosds-switching' and 'comparative measurement' for the process control of ion exchange recirculation plant
Process control of ion exchange plant is based on conductivity measurement of incoming and pure water. This method is stated to be insufficient and to require interpretation. 'Comparative measurement' of operating and regenerating individual columns avoids unnecessary regeneration cycles and chemical consumption.
'Dacrotatize' to protect
Use of 'Dacromet' spin- or dip-drain applied water based Zn chromate coating containing Zn and Al flake particles (Dacral SA., Paris, France) is described.
'Do it your way'
Description of analog wastewater treatment system at Stuart-Olver-Holtz, Rochester, NY (supplied by Pfaudler, converted to microprocessor control under demonstration project of EPA and Metal Finishers' Foundation).
'DOC' cleaning plant
'Dried in place' pretreatment for coil lines
Use of 'dried in place' coatings ('non-reactive' or 'no-rinse' coatings) is compared with conventional pretreatment processes. Process involves alkaline cleaning, hot water rinsing and application of water-borne coating comprising chromates, silica and fluoride. Advantages include multimetal application, shorter lines, heat savings, reduced effluent and fewer maintenance problems.
'Electroless' or autocatalytic gold plating
Describes electroless 'ZM' Au plating bath containing KOH 37, KCN 4, 'PCG' 6 g/1 as well as reducer and stabilizer at 90-95°C, plating initial 4-5 µm/h. Properties of coatings and operation of bath are discussed.
'Flame spraying' of thermoplastic powder
'Green' protective coatings.
Describes anti-fouling compositions of Jotun-Henry Clarke Ud., Matheson House, 142 Minories, London EC3N 1QL.