用仿生涂层控制金属镁的降解速率-JournalofNortheasternUniversity.PDFVIP

第31卷第10期 东 北 大 学 学 报 ( 自 然 科 学 版 ) Vol. 31, No. 10 2010 年 10 月 Journal of Northeastern U niversity( Natural cience) O ct. 2 0 1 0 1 2 1 1 张雅静 , 武志林 , 刘 越 , 张 丹 ( 1. , 110004; 2 ( ) , 110141) : , X ( BF) : , 24 h HA , , , : ; ; ; ; : TB 333; TB 34 : A : 1005-3026(2010) 10- 1466-04 Controlling the Biodegradation Rate of Magnesium by Biomimetic Coatings 1 2 1 1 ZH A N G Ya-j ing , W U Zhi-lin , LI U Yue , ZH A N G Dan ( 1. chool of Materials Metallurgy, Northeastern University, henyang 110004, China; 2. NFC ( henyang) Metallurgical Machinery Co. , Ltd. , henyang 11014 1, China. Correspondent : ZHANG Ya-jing, E-mail: zhangyj @ smm. neu. edu. cn) Abstract: ilica and silica calcium so-l gels w ere coated on the surface of magnesium, and then the hydroxyapatite ( HA ) coating w as formed on the surfaces of pure magnesium samples by biomimetic process, regardless of the so-l gel coating. The coating layers were characterized by XRD, EDX and EM, and the morphology of sample surfaces w as observed by an emission scanning electron microscope ( FE EM ) . The samples w ere subsequently immersed in the simulated body fluid ( BF) for the degradation test. The results show ed that HA coating is formed on the surface of pure magnesium 24 h after biomimetic process no matter w hether the so-l gels have already been coated before. It w as found that the HA coating can decrease the corrosion rate of the substrate in BF, i. e. , the degradation rate of samples is controllable if controlling the chemical composition and morphology of coating layers.