アルミニウム製フィン材の親水皮膜被覆方法、アルミニウム製フィン材及びアルミニウム製熱交換器

摘要

Provided is a method for surface treatment of a heat exchanger, capable of forming a hydrophilic film which exhibits excellent adhesion to a metal surface even in such a state that water adheres to the film and which exhibits excellent durability of hydrophilicity even in such a state that a contaminant adheres to the film and which does not emit a problematic odor even when used in a heat exchanger. Also provided are: an aluminum fin material which is obtained by forming a hydrophilic film on the surface of an aluminum fin by this method; and an aluminum heat exchanger using the aluminum fin material. In the method, a hydrophilizing treatment which comprises a hydrophilic resin and crosslinkable particles is applied to a metal surface to form a hydrophilic film on the surface, said hydrophilic resin comprising: a specific (meth)acrylic resin; polyvinyl alcohol; and polyethylene oxide and/or polyethylene glycol.