| 摘要 |
Soldering with lead-free alloys is enhanced by use of two additives to a molten solder bath. One additive is an oxygen barrier fluid that floats on or envelops a bath. Another additive is an oxygen or metal oxide scavenger in the bath. Exemplary scavengers include metals with a higher free energy of oxide formation than oxide of tin, reducing gas, or an electrode immersed in the bath. The oxygen barrier may be an organic liquid, preferably polar in nature, which forms at least a monomolecular film over static surfaces of the bath. An exemplary soldering process is wave soldering of printed circuit boards.
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