Solder fluxes bearing oxide removers generated by light

B - Operations – Transporting – 23 – K

Patent

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Details

IPC codes

B23K 35/34 (2006.01) B23K 35/36 (2006.01) H05K 3/34 (2006.01)

Type

Patent

Patent number

CA 2088148

Description

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.

n décrit des compositions de fondant contenant des composés qui produisent des acides après photoactivation par une source lumineuse comme les sources de lumière ultraviolette (UV) à Hg/Xe. Les acides éliminent les oxydes des plaques de circuit imprimé au cours de leur fabrication et, ensuite, se volatilisent sans nécessiter d'étape de nettoyage, sinon un simple nettoyage à l'eau. Les composés qui libèrent un agent qui élimine les oxydes, parfois appelé un photoacide, comprennent des sels d'onium métalliques et organiques et des composés furyliques portant un groupe carbonyle. Ces compositions fondant peuvent être utilisées en mélange avec des préparations de soudage typiques, comme la soudure plomb-étain, ou appliquées de manière topique sur ces dernières; les deux techniques permettent l'assemblage des plaques de circuit imprimé plus facilement et les liaisons sont de meilleure qualité.

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