Solder paste having solder alloy/formate complexes as oxide scav

Details Solder paste having solder alloy/formate complexes as oxide scav Solder paste having solder alloy/formate complexes as oxide scav

1990-10-31

1992-05-26

Rosenberg, Peter D.

Metal treatment

Compositions

Fluxing

148 23, 148 25, B23K 3534

Patent

active

051164337

ABSTRACT:
A solder paste is formulated by combining a solder paste vehicle, a resin, and solder alloy particles. The solder paste vehicle is made by combining mono and polyfunctional alcoholic solvents with a fluxing agent. The solder particles are first reacted with a formate ion produced by formic acid, formaldehyde, paraformaldehyde, or mixtures thereof, in order to create a metal-formate complex that functions as an oxygen scavenger on the surface of the solder alloy particles.

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