| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an anti-corrosion treatment method of a heat exchanger, to a heat exchanger made of an aluminum material in which a flux brazing is carried out by the NB method, in particular the heat exchanger made of aluminum for use in an air conditioner of an automobile, even if a chemical conversion treatment is not performed beforehand, without spoiling hydrophilicity, corrosion resistance can be sharply improved, and a deodorization property may be also improved. <P>SOLUTION: In the anti-corrosion treatment method for forming a hydrophilic coating film on the surface of the heat exchanger made of the aluminum material by baking treatment after bringing a heat exchanger made of the aluminum material flux brazed by a Nocolok brazing method into contact with a hydrophilic treatment liquid. The hydrophilic treatment liquid contains a hydrophilic resin and a lithium ion and the lithium concentration of the hydrophilic coating film is 0.05-25 mass%. <P>COPYRIGHT: (C)2011,JPO&INPIT |
