Patent ID: 8501327

Claim:
An aluminum alloy clad sheet, comprising: (i) a core layer; (ii) a sacrificial layer disposed on one side of the core layer; and (iii) a brazing layer comprising an Al-Si alloy disposed on the other side of the core layer, wherein the core layer (i) comprises Al and, by mass, Si: 0.15% to 1.6%, Mn: 0.3% to 2.0%, Cu: 0.1% to 1.0%, and Ti: 0.02% to 0.30%, and wherein the sacrificial layer (ii) comprises Al and, by mass, Zn: 4.0% to 10.0%, and Cr: 0.01% to 0.5%; wherein the clad sheet shows a maximum pitting corrosion depth of 30 μm or less in the sacrificial layer when the clad sheet is immersed for one month in a simulated cooling water solution containing Cl − : 195 mass ppm, SO 4 2− : 60 mass ppm, Cu 2+ : 1 mass ppm, Fe 3+ : 30 mass ppm, pH: 3.0, in repeated cycles of 88° C. for 8 hours and room temperature for 16 hours.