Aluminum alloy material having an excellent sea water corrosion resistance and plate heat exchanger

摘要

An aluminium alloy material having an excellent sea water corrosion resistance comprises an aluminium alloy substrate whose ten-points average surface roughness Rz, which is the average of five greatest peak-to-valley separations on the surface, is controlled at 0.3 µm or over, an organic phosphonic primer film formed on a surface of the aluminium alloy substrate, and a fluorine resin paint film formed on the primer film and having a dry average thickness of 1 to 100 µm. A plate heat exchanger having an excellent sea water corrosion resistance is also provided wherein the aluminium alloy material is used as a heat transfer unit using sea water as cooling water.