Aluminum alloy heat exchanger excellent in corrosion resistance in atmospheric environment and method of manufacturing aluminum alloy heat exchanger

摘要

PROBLEM TO BE SOLVED: To provide an aluminum alloy-made heat exchange manufactured by blazing conjugating a fin consisting of an aluminum alloy-made blazing sheet and an aluminum alloy-made tube having a Zn anticorrosive layer, and excellent in corrosion resistance in air environment.SOLUTION: Potential difference between a blazing material and a fillet is controlled within a specified range by depositing a Si-based deposition with a specified size in a remaining blazing material or diffusing Zn of the filet with conducting further a heat treatment on a heat exchanger after blazing. Because preferential corrosion of the fillet is suppressed thereby, fin detachment is not generated and durability to corrosion is enhanced by extending time that the fin acts to a tube as a sacrificial anode material.SELECTED DRAWING: None