The effects of alloying elements of Ca/Sn on corrosion behaviors of the as-cast Mg-4Zn-0.2Mn alloy were investigated by immersion tests and electrochemical methods.The results indicated that the average corrosion rate...The effects of alloying elements of Ca/Sn on corrosion behaviors of the as-cast Mg-4Zn-0.2Mn alloy were investigated by immersion tests and electrochemical methods.The results indicated that the average corrosion rate value of the Mg-4Zn-0.2Mn-Ca alloy was∼0.31 mm/year in Hank’s physiological solution for 40 days,and corrosion resistance increased for the specimens containing Ca element rather than that containing Sn because of the higher breakdown potential value,lower current density and deactivated corrosion rate,which was ascribed to a formation of the uniformly distributed Mg-Zn-Ca ternary phase.展开更多
Highly localized and minute depassivation events are recorded using 50μm diametertitanium microelectrode in Ringer's physiological solution. These transient events are believed to be due to microscopic breakdown ...Highly localized and minute depassivation events are recorded using 50μm diametertitanium microelectrode in Ringer's physiological solution. These transient events are believed to be due to microscopic breakdown of passivity and occur well below the pitting potential of the metal. A mechanism is proposed to explain the observed phenomenon.Possible implications on passivity and the application of metallic biomaterials in vivo are also discussed.展开更多
基金supported by National Key Research and Development Program of China(2016YFB0301101,2016YFB0301001)Beijing Natural Science Foundation(2172013).
文摘The effects of alloying elements of Ca/Sn on corrosion behaviors of the as-cast Mg-4Zn-0.2Mn alloy were investigated by immersion tests and electrochemical methods.The results indicated that the average corrosion rate value of the Mg-4Zn-0.2Mn-Ca alloy was∼0.31 mm/year in Hank’s physiological solution for 40 days,and corrosion resistance increased for the specimens containing Ca element rather than that containing Sn because of the higher breakdown potential value,lower current density and deactivated corrosion rate,which was ascribed to a formation of the uniformly distributed Mg-Zn-Ca ternary phase.
文摘Highly localized and minute depassivation events are recorded using 50μm diametertitanium microelectrode in Ringer's physiological solution. These transient events are believed to be due to microscopic breakdown of passivity and occur well below the pitting potential of the metal. A mechanism is proposed to explain the observed phenomenon.Possible implications on passivity and the application of metallic biomaterials in vivo are also discussed.
