| 摘要 |
PURPOSE:To obtain a brazed product having excellent resistance to corrosion without requiring flux removal by using a mixture composed of a specific ratio of K3AlF6 and AlF3 as a flux for brazing. CONSTITUTION:A mixture prepd. by mixing potassium hexafluoroaluminate K3AlF6 and aluminum fluoride AlF3 at 70-59:30-41 by weight is suspended into liquid such as water to obtain a suspension. Such suspension is coated on a joining member such as a heat exchanger formed of Al or Al alloy and after drying, the member is heated to a prescribed temp. in a nonoxidative atmosphere to melt the brazing material for joining, by which joining is accomplished. Since the flux is noncorrosive, the brazed product having excellent resistance to corrosion is obtd. by the simple operation. |
