| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an aluminum alloy clad material which has sufficient corrosion resistance even in a high-temperature and alkaline environment and causes no through pitting corrosion at an early stage. <P>SOLUTION: The aluminum alloy clad material has a core material whose one face is cladded with a brazing filler metal and whose other face is cladded with a sacrificial material. The sacrificial material is an aluminum alloy comprising, by mass: 1.0-8.0% Zn, one or more elements selected from 0.85-1.5% Fe, 0.85-1.5% Ni, 0.85-2.0% Si, 0.2-0.5% Cu and 0.01-0.05% Ti, and the balance being Al and unescapable impurities. In this case, the cathode current density of the brazing filler metal is 20 μA/cm<SP POS="POST">2</SP>or below at the natural potential of the sacrificial material shown in a corrosion liquid with a pH value of 9-11 at a temperature of 80-100°C. <P>COPYRIGHT: (C)2012,JPO&INPIT |
