Bond enhancement antitarnish coatings

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly alloy coating

Reexamination Certificate

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C205S244000, C205S704000, C427S436000, C427S437000, C428S658000, C428S666000, C428S674000, C428S687000, C428S935000, C428S936000, C106S001170, C106S001220, C106S001250, C106S001290

Reexamination Certificate

active

06837980

ABSTRACT:
Aqueous electroplating solutions and methods are provided for the codeposition of zinc and chromium. The solutions include effective amounts of zinc, chromium, and hydroxyl ions. The solutions further include an effective amount of one or more ions of alkali metals, alkaline earth metals, or a combination thereof other than sodium and potassium, to in major part balance the hydroxyl ions. A preferred alkali metal is rubidium.

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“Metallization Contamination,” Microelectronic Defects Database, CALCE Electronic Products and Systems Center, University of Maryland, Apr. 12, 2000.
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Lee, C., et al., “An Analytical Characterization and Reliability Testing of an Adhesion Enhancing Zn-Cr Leadframe Coating for Popcorn Prevention”, Conference Preprint, 1998, 9 pages, (no month given).
International Search Report for PCT/US01/50660, filing date Dec. 20, 2001.

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