Effect of grain size on corrosion behavior of 316L stainless steel in simulated body fluid environment
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
万方数据
维普
