Heat exchanger having fins with sterilizing surface, metal member having sterilizing surface, sterilization method using fin surface of heat exchanger, electric water heater having metal member, and beverage feeder And lunch box lid

摘要

A heat exchanger includes a fin, the fin including a metal base and a porous anodized layer formed on the metal base. A surface of the porous anodized layer has a submicron-order uneven structure, the uneven structure including a plurality of recessed portions whose two-dimensional size viewed in a normal direction of the surface is more than 100 nm and less than 500 nm.