Metal treatment – Compositions – Fluxing
Patent
1993-10-12
1994-08-23
Rosenberg, Peter D.
Metal treatment
Compositions
Fluxing
148 23, B23K 3534
Patent
active
053404114
ABSTRACT:
The surface of a fatigue-resistant eutectic or near-eutectic lead/tin solder containing at least one doping element of cadmium, indium, and antimony is treated with an aqueous solution of an acidic chloride or acidic nitrate. The surface treatment method of the present invention removes, or substantially reduces, the presence of any cadmium, indium, and/or antimony, as well as the oxides of tin and lead, leaving a surface that is substantially tin and lead. The resulting treatment renders the solder compatible with mildly reducing fluxes of low activity and improves the wettability of the solder.
REFERENCES:
patent: 139297 (1873-05-01), Cox
patent: 803802 (1905-11-01), Ball
Megerle Clifford A.
Wong Boon
Denson-Low W. K.
Hughes Aircraft Company
Lachman M. E.
Rosenberg Peter D.
Sales M. W.
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