Preliminary Observation of Carbon in Pre-Tinned Specimens

Conference · Mon Jul 01 00:00:00 EDT 1991

OSTI ID:5409575

Sunwoo, A. J. ^[1]; Morris, Jr., J. W. ^[1]; Lucey, Jr., G. K. ^[2]

---

1. Lawrence Berkeley Laboratory (LBL), Berkeley, CA (United States)
2. Harry Diamond Laboratories (HDL), Adelphi, MD (United States)

Flux is generally applied on a metal surface before soldering to help clean the surface. The decomposed flux may evolve to the surface as dross or may remain in the molten solder. The motivation for this work is the observation of high concentrations of carbon in the surface of pre-tinned Cu-clad printed circuit boards, while other contaminants disappear after an initial sputtering. Four different surface conditions are analyzed using Auger electron spectroscopy. The results confirm that the presence of carbon in pre-tinned specimens is due to the use of flux. The effect of carbon on solderability is not yet known.

• Research Organization: Lawrence Berkeley Laboratory (LBL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE; US Army
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5409575
• Report Number(s): LBL--31000; CONF-911003--7; ON: DE91016990; CNN: MIPR No.R91-056
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CARBON
DETECTION
ELECTRON SPECTROSCOPY
ELEMENTS
FABRICATION
JOINING
JOINTS
LEAD ALLOYS
LEAD BASE ALLOYS
METALLURGICAL FLUX
NONMETALS
SOLDERED JOINTS
SOLDERING
SPECTROSCOPY
SURFACES
TIN ALLOYS
WELDING