ELECTROLYTE MEDIA FOR THE DEPOSITION OF TIN ALLOYS AND METHODS FOR DEPOSITING TIN ALLOYS

Title:

ELECTROLYTE MEDIA FOR THE DEPOSITION OF TIN ALLOYS AND METHODS FOR DEPOSITING TIN ALLOYS

Document Type and Number:

WIPO Patent Application WO2002072923

Kind Code:

A3

Abstract:

An electroplating bath medium for electroplating articles with a tin-cobalt, tin-nickel, or tin-cobalt-nickel alloy comprises: at least one tin salt; an alloying metal salt comprising a cobalt salt and/or a nickel salt; a complexant comprising a hydroxycarboxylic acid or alkali metal salt thereof such as a sodium or potassium gluconate or heptonate complexant; boric acid; and a bath soluble substituted phenolic compound. The current regime applied to the plating bath can include time intervals of direct current and of pulsed current in order to selectively control the deposition of tin by activation or diffusion control.

Inventors:

HERDMAN RODERICK DENNIS (GB)
PEARSON TREVOR (GB)

Application Number:

PCT/GB2002/001044

Publication Date:

April 08, 2004

Filing Date:

March 13, 2002

Export Citation:

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Assignee:

MACDERMID PLC (GB)
HERDMAN RODERICK DENNIS (GB)
PEARSON TREVOR (GB)

International Classes:

C25D3/60; C25D5/18; C25D7/10; F16C33/14; (IPC1-7): C25D3/60; C25D5/18; C25D7/10; F16C33/12

Foreign References:

US5156729A	1992-10-20
US4795682A	1989-01-03

Other References:

DATABASE WPI Section Ch Week 198027, Derwent World Patents Index; Class M11, AN 1980-47445C, XP002269507
ABD EL REHIM S S ET AL: "ELECTRODEPOSITION OF SN-CO ALLOYS FROM GLUCONATE BATHS", 1 April 1996, JOURNAL OF APPLIED ELECTROCHEMISTRY, CHAPMAN AND HALL. LONDON, GB, PAGE(S) 413-418, ISSN: 0021-891X, XP000590299

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