Surface treatment method of metal member and cleaning nozzle

摘要

A surface treatment method of a metal member according to an embodiment of the invention includes removing an oily substance on the metal member by using gas-liquid two fluids that are obtained by boiling heated and pressured water under ordinary pressure. A surface treatment device of a metal member for removing an oily substance on the metal member includes self-generation two fluids production means for producing gas-liquid two fluids by boiling heated and pressured water under ordinary pressure, and a surface treatment room carrying out a surface treatment by bringing the self-generation two fluids into contact with the metal member.