Patent ID: 6050479
Filing Date: 2000-04-18
Classification: B23K,C11D,C23G,H05K

Abstract:
A method comprising the steps of:(a) soldering a member to a substrate using flux,(b) cleaning the flux remaining on the substrate with a first liquid, the first liquid being a defluxing agent containing an acid and an organic solvent and containing substantially no water,the organic solvent being a mixture containing 50-95 parts by weight of an aromatic solvent having 6-20 carbon atoms, and 5-50 parts by weight of at least one solvent selected from the group consisting of ester solvents having 3-15 carbon atoms, ketone solvents having 2-15 carbon atoms, ether solvents and alcohol solvents having 1-15 carbon atoms, andthe organic solvent contains substantially no chlorine or fluorine, and(c) cleaning the substrate with a second liquid which contains no acid and readily mixes with said acid-containing defluxing agent, to remove the acid.