Electrolysis: processes – compositions used therein – and methods – Electrolytic material treatment – Metal or metal alloy
Reexamination Certificate
2006-12-12
2006-12-12
Bell, Bruce F. (Department: 1746)
Electrolysis: processes, compositions used therein, and methods
Electrolytic material treatment
Metal or metal alloy
C205S731000, C205S735000, C205S736000, C205S740000
Reexamination Certificate
active
07147768
ABSTRACT:
A process of reducing scaling of a metal surface exposed to an aqueous solution from which scale may form after a period of exposure. The process comprises applying a cathodic potential to the surface for at least some of the period of exposure. In some cases, e.g. when an article is made of a ferrous metal, it is advantageous to coat the article with a different metal (e.g. copper or an alloy of copper) before applying the cathodic potential to avoid hydrogen generation and excessive current flow. An article to be protected from scaling may also advantageously be electrically isolated from other parts of an apparatus.
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Steinhagon et al., “Problems and Costs due to Heat Exchanger Fouling . . . ”,Heat Tsfr. Eng'r's, vol. 14, pp. 19-29 (1993), no month available.
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English translation of JP 02-188424, Jul. 24, 1990, Showa Denko KK (translation only).
Baeckmann et al., Handbuch des Kathodischen Korrosionsschutzes (1980), English translation of pp. 58-59, 275, 364, 371-374 (translation only), no month available.
PCT Written Opinion mailed Aug. 26, 2004 in International Application No. PCT/CA03/01200.
Alcan International Limited
Bell Bruce F.
Cooper & Dunham LLP
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