title: Influence of Surrounding Cations on the Surface Degradation of Magnesium Alloy Implants under a Compressive Pressure.
abstract: The effect of cations in the surrounding solutions on the surface degradation of magnesium alloys, a well-recognized biodegradable biomaterial, has been neglected compared with the effect of anions in the past. To better simulate the compressive environment where magnesium alloys are implanted into the body as a cardiovascular stent, a device is designed and employed in the test so that a pressure, equivalent to the vascular pressure, can be directly applied to the magnesium alloy implants when the alloys are immersed in a medium containing one of the cations (K(+), Na(+), Ca(2+), and Mg(2+)) found in blood plasma. The surface degradation behaviors of the magnesium alloys in the immersion test are then investigated using hydrogen evolution, mass loss determination, electron microscopy, pH value, and potentiodynamic measurements. The cations are found to promote the surface degradation of the magnesium alloys with the degree decreased in the order of K(+) > Na(+) > Ca(2+) > Mg(2+). The possible mechanism of the effects of the cations on the surface degradation is also discussed. This study will allow us to predict the surface degradation of magnesium alloys in the physiological environment and to promote the further development of magnesium alloys as biodegradable biomaterials.
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Chengyun
authors.initials: C
authors.lastname: Ning
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma , 101 Stephenson Parkway, Norman, Oklahoma 73019, United States.
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Yu
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Shuangying
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Tianrui
authors.initials: T
authors.lastname: He
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Weiping
authors.initials: W
authors.lastname: Li
authors.affiliation: Institute of Chemical Engineering and Light Industry, Guangdong University of Technology , Guangzhou, 51006, China.
authors.forename: Guoxin
authors.initials: G
authors.lastname: Tan
authors.affiliation: School of Materials Science and Engineering, South China University of Technology , Guangzhou, 510641, China.
authors.forename: Yingjun
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma , 101 Stephenson Parkway, Norman, Oklahoma 73019, United States.|School of Materials Science and Engineering, Zhejiang University , Hangzhou, Zhejiang 310027, China.
authors.forename: Chuanbin
authors.initials: C
authors.lastname: Mao
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D055664:Electrochemical Techniques; D006863:Hydrogen-Ion Concentration; D008274:Magnesium / Q000737:chemistry*; D010316:Particle Size; D011312:Pressure; D013499:Surface Properties
chemical_list: D000497:Alloys; D002412:Cations; D008274:Magnesium