ALUMINUM FIN WITH SUPERIOR HYDROPHILIC PROPERTY AFTER BRAZING TREATMENT, HEAT EXCHANGER AND THEIR PROCESS OF MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide an aluminum fin having superior hydrophilic property after brazing and heating and not producing any color change in its outer appearance.;SOLUTION: An aluminum fin of this invention is an aluminum fin that is brazed against an aluminum tube having a refrigerant flow passage inside and has a feature in which at least one of a front surface and a rear surface is provided with a hydrophilic film composed of a boehmite film with a thickness of 100 to 10000Å It is preferable that a hue value of the surface provided with said hydrophilic film is L:70 to 100, a:-3 to +5 and b:-3 to +10. It is preferable that a water contact angle after a dry wet cycle test upon brazing heat treatment is carried out by 14 cycles in a brazing heat treatment at a surface provided with said hydrophilic film is less than 40 degree.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT