Browse Prior Art Database

Stabilizer for Chemical Nickel Boron Baths

IP.com Disclosure Number: IPCOM000122667D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 26K

Publishing Venue

IBM

Related People

Buchwald, C: AUTHOR [+6]

Abstract

Chemical (electroless) nickel baths, containing boron hydrides, amine boranes, and in particular dimethylamine boranes (DMAB), are thermodynamically instable.

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Stabilizer for Chemical Nickel Boron Baths

      Chemical (electroless) nickel baths, containing boron
hydrides, amine boranes, and in particular dimethylamine boranes
(DMAB), are thermodynamically instable.

      During nickel deposition on palladium-activated molybdenum
surfaces, this may lead to spontaneous nickel deposition in
non-activated regions.

      Thus, for example, during the treatment of Pd-activated ceramic
substrates in unstabilized baths, nickel deposition has also been
observed in the ceramic regions.  In particular circumstances, this
may cause autocatalytic decomposition of the entire baths.

      By adding very small quantities (typically 200 to 600
micrograms/l) of 2,2'-dithio diacetic acid or trithio diacetic acid,
the baths are effectively stabilized and nickel is highly selectively
deposited in Pd-activated regions.

      The useful life of the baths (previously 1 to 3 days) is
increased 100 times by such stabilizing measures.