To provide a method for improving corrosion resistance of a stainless steel product in which high corrosion resistance can be easily imparted to an exhaust gas path of a heat exchanger or the like.
The method for improving corrosion resistance of a stainless steel product (workpiece) after assembled by brazing and/or welding includes the following steps: (1) a passive film-removing step of removing a passive film in a part to be plated of the workpiece to form a surface of a stainless steel base material; (2) an electroless plating step of forming an Ni-P-based electroless plating layer on the part to be plated; and (3) a diffusion step of heat-treating the stainless steel product to allow mutual diffusion to occur between the electroless plating layer and the stainless steel base material.
OTA AKIHIRO
SAWAMURA MASAHIRO
Michiko Ema
Chiori Ueda
Takaya Muramatsu