Heat exchanger, heat exchanger tube member, heat exchanger fin member and process for fabricating the heat exchanger

摘要

Suppose each of the refrigerant tubes 53 of a heat exchanger has a potential A at a surface layer portion 53 a of an outer periphery thereof and a potential B at a core 53 b of the tube 53 other than the surface layer portion 53 a thereof, each of the fins 54 has a potential C, and a fillet 59 formed at the brazed portion between the tube 53 and the fin 54 has a potential D. These potentials then have the relationship of A ?C ?D<B. The potential A of the surface layer portion 53 a of the outer periphery of the refrigerant tube 53 is -850 to -800 mV, the potential B of the core 53 b of the tube 53 is -710 to -670 mV, the potential C of the fin 54 is -850 to -800 mV, and the potential D of the fillet 59 is -850 to -800 mV.