To improve the corrosion resistance of medical metal materials,a commercial 316L stainless steel was used as the re-search object.Ultrafine-grained(UFG)sample with average grain size of 198 nm,submicron-grained(SMG)sample with average grain size of 776 nm and fine-grained(FG)sample with average grain size of 1.18 μm were prepared by cold rolling and annealing treatment.The potentiodynamic polarization curves and electrochemical impedance spectroscopy of samples with different aver-age grain sizes in simulated body fluid were measured by electrochemical experiments.The results show that the corrosion poten-tial and breakdown potential increase as the average grain size decreases,and UFG samples have higher corrosion potential(-0.38 VSCE)and breakdown potential(-0.03 VSCE).The capacitance radius increases as the grain size decreases,the corro-sion resistance of 316L stainless steel in simulated body fluid is improved by grain refinement.The ultrafine-grained 316L stain-less steel with an average grain size of 198 nm prepared at annealing temperature of 750 ℃ for 5 min has the best corrosion resist-ance in simulated body fluid environment.
316L stainless steelcold rolling and annealing processgrain sizesimulated body fluidcorrosion resistance
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