| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment method for a heat exchanger, capable of, at a step of cutting a stock solution of a surface treatment film, securely removing an excess stock solution to form the surface treatment film having a uniform thickness.SOLUTION: A surface treatment method for a heat exchanger 1 includes the steps of: applying hydrophilic paint to a surface of the heat exchanger 1 (applying step); spraying an air flow to a fin 4 to remove the hydrophilic paint to adjust an adhesion amount of the hydrophilic paint to be applied to the fin 4 (first liquid cutting step); thereafter, spraying an air flow to a drain part 5 to remove the hydrophilic paint to adjust an adhesion amount of the hydrophilic paint to be applied to the drain part 5 (second liquid cutting step); and then forming a film of the hydrophilic paint (film forming step). |
