Patent ID: 9139913
Filing Date: 2015-09-22
Classification: B05D,B23K,C09D,C23C,F28F

Abstract:
1. An anti-corrosion treatment method for an aluminum material-made heat exchanger comprising subjecting an aluminum material-made heat exchanger having been flux-brazed by the NOCOLOK brazing process to hydrophilic treatment liquid and then applying a baking treatment to form a hydrophilic film on the surface of the aluminum material-made heat exchanger, wherein the hydrophilic treatment liquid contains a hydrophilic resin and a lithium ion, and a lithium concentration in the hydrophilic film is from 0.05 to 25% by mass; and an ion exchange reaction occurs between an alkali metal ion in the flux and a lithium ion from the hydrophilic film, the reaction forming a sparingly soluble film at least at an interface between the flux and the hydrophilic film.