Precleaning of soldered circuit cards to prevent white residue

Details Precleaning of soldered circuit cards to prevent white residue Precleaning of soldered circuit cards to prevent white residue

Category

H - Electricity

Subcategory

05

Subsubcategory

K

IPC codes

H05K 3/22 (2006.01) H05K 3/26 (2006.01)

Type

Patent

Patent number

CA 2114664

Description

PRECLEANING OF SOLDERED CIRCUIT CARDS TO PREVENT WHITE RESIDUE ABSTRACT OF THE DISCLOSURE Following soldering of electrical components on a circuit card in a soldering process that includes use of an aqueous-based flux, the circuit card, containing the sol- dered electrical components, is exposed to a dilute aqueous basic solution prior to a final hot water rinse. The di- lute basic solution prevents the formation of a white res- idue commonly associated with the use of aqueous-based fluxes. For example, using a flux consisting essentially of an aqueous solution of citric acid, and rinsing in ei- ther an aqueous ammonia solution consisting essentially of about 20 to 250 ppm ammonium hydroxide or an aqueous so- lution of about 0.1 to 3 wt% sodium bicarbonate, prevents formation of the white residue.

Affiliated with

Also associated with

Rating

Precleaning of soldered circuit cards to prevent white residue does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Precleaning of soldered circuit cards to prevent white residue, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precleaning of soldered circuit cards to prevent white residue will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1620175