Metal treatment – Compositions – Fluxing
Patent
1998-07-09
1999-08-03
Andrews, Melvyn
Metal treatment
Compositions
Fluxing
148 26, B23K 35365
Patent
active
059320311
ABSTRACT:
A mixture of a dye including one or more water soluble fluorescent dyes and a water soluble solder flux provides simple optical inspection under ultraviolet illumination with simple apparatus. The optical inspection is thus made highly sensitive to the presence of residual water soluble flux after washing and highly specific to the water soluble flux with which the dye is mixed. Thus, optical inspection can assure that all water soluble flux is removed to avoid subsequent corrosion while providing the possibility of leaving so-called "no clean" fluxes in place.
REFERENCES:
patent: 4563224 (1986-01-01), Gen et al.
patent: 4670298 (1987-06-01), Lucas et al.
patent: 5650020 (1997-07-01), Ohta et al.
Hamilton Mark R.
Malone Marc V.
Merz, III Charles J.
Poole Joseph D.
Andrews Melvyn
Fraley Larry
International Business Machines - Corporation
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