The effects of strain and chloride concentration on pitting susceptibility for type 304 stainless steel were studied

in situ

using the electrochemical technology under constant strain.The impact factor f

ε

was brought forward to value the effect of strain on pitting.The pitting behaviors of type 304 stainless steel in various chloride concentrations under the strain levels 0%

10%

and 30%were investigated.Potentiostatic polarization technology was used to study how the chloride concentration affected corrosion current density.The results indicated that

f

ε

increased substantially and pitting potential varied remarkably when chloride concentration was over 90 mg·L

-1

. Un-der the three levels of strain mentioned above

when chloride concentration was below 463 mg·L

-1

121 mg·L

-1

and 98 mg·L

-1

respectively

the pitting potential shifted towards positivity and

the passive film became more stable. When the strain was below 10%

the pitting susceptibility of type 304 stainless steel varied greatly as strain increased

whereas the susceptibility only changed a little when the strain was over 10%