In order to improve the corrosion resistance of stainless steel

taking 304

316 L

410 and 420 J2 stainless steel plates as raw materials

laser remelting technology was acted on the surface of the plates to analyze microstructure of the remelted layer by optical microscope（OM） and energy spectrometer（EDS）. Electrochemical experiments were conducted to analyze the changes in the corrosion resistance of stainless steel before and after remelting. The results indicate that the microstructure is transformed and grains are refined after laser remelting action on the surface of stainless steel. When the laser power is 1 800 W and the scanning speed is 10 mm/s

the self-corrosion potentials of 304 and 410 stainless steel are-0.005 V and-0.552 V

respectively

which are about 0.008 times and 0.86 times that of the substrate. When the laser power is 1 400 W and the scanning speed is 10 mm/s

the self-corrosion potentials of 316 L and 420 J2 stainless steel are-0.367 V and-0.577 V

respectively

which are 0.67 times and 0.98 times that of the substrate. Therefore

the corrosion resistance of stainless steel can be effectively improved after laser remelting.