Plastic deformation of AISI304 stainless steel was carried out at -70 ℃ and 180 ℃. The distribution of dislocations was observed with transmission electron microscope (TEM)

martensite phase content was determined by use of ferrmagnetometer

and the corrosion behavior of AISI304 stainless steel was studied by potentiodynamic polarization in 0.5 mol·L-1 MgCl2 solution at 50 ℃. The results showed that plastic deformation at both -70 ℃ and 180 ℃ made the dislocation density of AISI304 stainless steel increase with the increase of deformation. Martensite phase transformation was induced for deformation at -70 ℃

whereas it was not at 180 ℃. As the dislocation density increased

the breakdown potential of AISI304 stainless steel’s passive film became a little more positive. As martensite phase content increased

it became more negative and pitting corrosion resistance decreased.