Electrochemical behaviour and passive film characteristics of an ultra-thin 316 L foil with a thickness of20μm in 3.5 wt.%NaCl solution were investigated using multiple techniques,focusing on the effect of microstruc...Electrochemical behaviour and passive film characteristics of an ultra-thin 316 L foil with a thickness of20μm in 3.5 wt.%NaCl solution were investigated using multiple techniques,focusing on the effect of microstructure,the applied potential,and the pH of the solution.The microstructure contains mainly fine grains(~4μm)with high-angle boundaries and preferential orientation of(220),and no MnS inclusion was detected.The electrochemical measurements show a significantly higher breakdown potential and lower passive current density for the 316 L foil than traditional wrought 316 L.The surface analyses using angle-resolved X-ray photoelectron spectroscopy(ARXPS)and time-of-flight secondary ion mass spectroscopy(TOF-SIMS)reveal that,compared to the wrought material,both the inner and out parts of the passive film on the 316 L foil are more enriched in Cr-and Mo-oxides.The microstructure favourable for elemental diffusion and the absence of MnS inclusion facilitate the formation of a continuous compact Cr-and Mo-rich passive film,which effectively retards corrosion in NaCl solution and remains stable in acidic solution(pH 2)or at high polarised potential up to 600 mV vs Ag/AgCl.展开更多
3D-printing is an emerging technology that challenged wrought counterparts by one-step manufacturing for complicated biological devices.However,the material properties and surface features due to manufacturing paramet...3D-printing is an emerging technology that challenged wrought counterparts by one-step manufacturing for complicated biological devices.However,the material properties and surface features due to manufacturing parameters play an important role on the corrosion behaviour and influence the toxicity of the material as an implant.In this paper,the improvement of pitting potential was observed by electrochemical experiments as the result of grain refinement of DMLS 316 L at 200 W laser power.The ICP results verified the supressed release of toxic cations after the formation of the passive film with enhanced characteristics.However,the pores from DMLS 316 L have the potential to develop into pits when polarised above pitting potential,promoting the risk of using 3D-printed 316 L as implant materials.展开更多
基金the National Natural Science Foundation of China(No.5210010403)the China Postdoctoral Science Foundation(No.2021M690345)the Swedish Foundation for International Cooperation in Research and Higher Education(STINT project for Swedish-China collaboration,No.CH2017-7255)。
文摘Electrochemical behaviour and passive film characteristics of an ultra-thin 316 L foil with a thickness of20μm in 3.5 wt.%NaCl solution were investigated using multiple techniques,focusing on the effect of microstructure,the applied potential,and the pH of the solution.The microstructure contains mainly fine grains(~4μm)with high-angle boundaries and preferential orientation of(220),and no MnS inclusion was detected.The electrochemical measurements show a significantly higher breakdown potential and lower passive current density for the 316 L foil than traditional wrought 316 L.The surface analyses using angle-resolved X-ray photoelectron spectroscopy(ARXPS)and time-of-flight secondary ion mass spectroscopy(TOF-SIMS)reveal that,compared to the wrought material,both the inner and out parts of the passive film on the 316 L foil are more enriched in Cr-and Mo-oxides.The microstructure favourable for elemental diffusion and the absence of MnS inclusion facilitate the formation of a continuous compact Cr-and Mo-rich passive film,which effectively retards corrosion in NaCl solution and remains stable in acidic solution(pH 2)or at high polarised potential up to 600 mV vs Ag/AgCl.
基金supported by the Postdoctor Research Foundation of Shunde Graduate School of University of Science and Technology Beijing(No.2020BH013)National Natural Science Foundation of China(Grant No.51871027)High-tech Ship Research Projects Sponsored by MIIT(No.2019GXB01-01-004)。
文摘3D-printing is an emerging technology that challenged wrought counterparts by one-step manufacturing for complicated biological devices.However,the material properties and surface features due to manufacturing parameters play an important role on the corrosion behaviour and influence the toxicity of the material as an implant.In this paper,the improvement of pitting potential was observed by electrochemical experiments as the result of grain refinement of DMLS 316 L at 200 W laser power.The ICP results verified the supressed release of toxic cations after the formation of the passive film with enhanced characteristics.However,the pores from DMLS 316 L have the potential to develop into pits when polarised above pitting potential,promoting the risk of using 3D-printed 316 L as implant materials.
