AUTOMOTIVE HEAT EXCHANGER SUPERIOR IN CORROSION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide an automotive heat exchanger that is made by joining fins to a tube material having a skin material of pure Al and to the surface of the skin material, and is provided with a sacrificial protection layer having a low corrosion rate due to an Al-Si alloy layer which is formed on the surface of the pure Al by the flow of a brazing filler metal and suppresses the promotion of a cathode reaction. SOLUTION: The Al alloy tube material is made by cladding a skin material formed from Al with a purity of 99.5 mass% or more on at least one side of a core material made from an Al alloy. The fin material is made by cladding a brazing-filler material of an Al alloy containing 3 to 8 mass% Si on a core material. The automotive heat exchanger is made by employing a material formed by joining the fin material to the skin material surface of the tube material. COPYRIGHT: (C)2010,JPO&INPIT