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

Recently published patents

Polyphenylene Sulf ide Protected

Geothermal S team Transportat ion

P i p e

US. 2004237890 (Halliburton Energy Serv. Inc.) Bour, D.L. Method and metal equipment for use in wells, wherein metal equip- ment is used in the operation and drilling of a well. The method com- prises applying a polyphenylene sulfide coating to the surface and curing the polyphenylene sulfide coating, cleaning the surface before applying the polyphenylene sulfide coating and applying a primer coating to the surface.

M e t h o d for Recover ing Copper

f rom a Used Ammoniaca l Etching

Solut ion and for Regenerat ing an

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A m m o n i u m Salt

WO 2004104269 Bedos, J.P.; Jonca, H.; et al. Recovering copper from a used ammoniacal etching solution con- taining the same in the form of Cu(II), by electrolysis. Ammonia is added to the used etching solution; and the solution is electrolyzed at the same time as the addition or, subsequently, as a result of which metallic copper is deposited on the cathode and a recharging solution comprising a mixture of an ammo- nium salt of formula (NH 4+, X9 and ammonia is obtained, X- represent- ing a halide ion in the formula of the complex and the salt.

Magnes ium Anodizat ion System

and Methods

US. 2004238368 Mawston, L G.

PATTI ADHESION TESTERS

Customized Accessories "PIPs" Instant Pull Stubs New Computer Interface

from SEMicro Division

M.E. Taylor Engineering, Inc. Phone (301) 975-9798

Fax (301) 975-9653

See What's New/

On the Web at www.adhesiontesting.com

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Anodizing magnesium material immersed in an aqueous elec- trolyte solution having a pH of about 7, and in the presence of a phosphate, the electrolyte solution also containing a sequestering agent. The method may further include the provision of a plasma- suppressing substance within the electrolyte solution. Furthermore, the electrolyte solution may also preferably include a ter t iary amine such a TEA, and the current passed through the electrolyte solution may preferably be a straight DC current.

Method and Installation for the

Densification of Substrates by

Means of Chemical Vapor infiltration

US. 2004237898 Bernard, B.; Goujard, S.; et al. A method of densifying porous substrates by chemical vapor impregnation, which comprises loading porous substra tes for densification in a loading zone of an enclosure, heat ing the inter- nal volume of the enclosure, and introducing a reagent gas into the enclosure through an inlet situated at one end of the enclo- sure. Before coming into contact with substrates si tuated in the loading zone, the reagent gas admit ted into the enclosure is preheated, at least in part , by passing along a duct connected to the gas inlet and extending through the loading zone, the duct being raised to the tempera- ture inside the enclosure, and the preheated reagent gas is distrib- uted in the loading zone through one or more openings formed in the side wall of the duct, along the duct.

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