| 摘要 |
PURPOSE:To eliminate the need for a treatment for removing a flux for brazing and to enable execution of a sacrificial corrosion preventive treatment by using a mixture prepd. by adding Zn, ZnO and ZnF2 at a specific ratio to KAlF4 or KAlF4 and AlF3. CONSTITUTION:Pottasium tetrafluoroaluminate KAlF4 or a mixture prepd. by mixing the same and aluminum fluoride AlF3 at >=97.8:<=2.2 by weight is mixed with >=1 kind among Zn, ZnO and ZnF2 at 95-60:5-40 by weight to obtain a mixture. A suspension prepd. by suspending such mixture in liquid such as water 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. |
