Study of Oxidation Problems Using Copper Foils in an Industrial Vapor-Phase-Soldering Apparatus

Abstract

Oxygen concentration in a vapor phase of Vapor-Phase-Soldering (VPS) is considered to be negligible. Any coloration of a copper foil by oxidation was not observed, even after one hour heating in a vapor phase of perfluoro-tri-pentylamine. Surface analyses of the specimens showed no increase of copper oxide. On the other hand, oxidation of copper foils in a pre-heating furnace of the VPS system was slight under normal conditions. Considering that a small amount of copper oxide can be eliminated by fluxes in a solder paste used, it is concluded that VPS is an excellent soldering, with little oxidation problem.