Oxide film removal method

An oxide film removal method that is a method for removing an oxide film 20 on the surface of a superalloy part 1 that contains a first metal, which is a base metal, and a second metal that differs from the first metal. The oxide film removal method is provided with a step for placing the superalloy part 1 inside a heating chamber 50, a reducing step for reducing oxides of the base metal to the base metal by heating the interior of the heating chamber 50 while maintaining a reducing gas atmosphere or a vacuum atmosphere, and an acid treatment step for applying an acid solution on the superalloy part 1 after the reducing step. The method effectively removes an oxide film on the surface of a superalloy without using highly toxic gaseous fluoride.