| 摘要 |
PURPOSE:To improve grain boundary corrosive resistance after brazing and corrosion resistance of soldered part by constituting a composite material by Al alloy base material containing the specific wt.% of Mn, Si, Cu and Cr and a coating material of Al alloy containing the specific % of Si and Zn. CONSTITUTION:The composite material is composed of the Al alloy containing 0.5-1.2 wt.% Mn, 0.5-1.5% Si, 0.1-0.8% Cu, 0.05-0.35% Cr and <=0.3% Fe as the base material of the composite material and the Al alloy containing 5-15% Si, <= 1.2% Zn as the coating material. If necessary, a little quantity of Mg is added to the base material and also Al alloy-made pseudoanode mate rial containing 0.05-0.8% Mg, <=1.5% Zn is used. As Mn and Si are contained at suitable quantity, the grain boundary corrosive resistance after brazing is improved, and the corrosion resistance at the brazing part is improved by Si and Zn components in the coating material. |
