Metal treatment – Compositions – Fluxing
Patent
1990-08-13
1991-09-03
Rosenberg, Peter D.
Metal treatment
Compositions
Fluxing
B23K 3534
Patent
active
050451286
ABSTRACT:
Fluxing compositions containing compounds that generate acids upon photoinitiation from a light source such as Hg/Xe ultraviolet (UV) light sources are described. The acids clean oxides from the printed circuit boards (PCBs) under assembly and then volatilize with little or no need for a cleaning step, or cleaning only with water. The compounds that release an oxide removing agent, sometimes called a "photoacid" include metal and organic onium salts and furyl compounds bearing a carbonyl group. Such fluxing compositions can be used mixed with typical solder formulations, such as lead/tin solders, or applied topically thereto; both techniques permit the assembly of PCBs more easily and with high quality bonds.
REFERENCES:
patent: 2758940 (1956-08-01), Baker
WPI Abstract 83-38150K/16 or JP 58042651 Document, Week 83-16, 1983.
Davis James L.
Landreth Bobby D.
Nounou Fadia
Pennisi Robert W.
Motorola Inc.
Nichols Daniel K.
Rosenberg Peter D.
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