(1. 中南大學 粉末冶金國家重點實驗室，長沙 410083；
2. 中南大學 湘雅醫(yī)院，長沙 410008；
3. 中南大學 湘雅醫(yī)學院，長沙 410013)
摘 要: 以Zn與Ca為合金組元，采用熔融澆注法制備3種Ca含量分別為1%、2%和3%的Mg-Zn-Ca三元鎂合金生物可降解材料，并對3種鎂合金在Hank模擬體液中的質(zhì)量損失腐蝕及電化學腐蝕行為進行研究。對不同腐蝕時間的合金表面形貌以及合金組織和相成分進行分析。結果表明：鎂合金的腐蝕是從鎂基相的點蝕開始的，含Ca量為1%的鎂合金表現(xiàn)出良好的抗腐蝕性能；合金中Mg2Ca相的分布顯著影響合金的耐腐蝕性能，合金體中Mg2Ca相的含量隨著合金中Ca含量的增加而增加，導致合金的抗腐蝕性能變差。
關鍵字: Mg-Zn-Ca合金；Hank溶液；電化學腐蝕；Mg2Ca相；生物降解
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Xiangya Hospital, Central South University, Changsha 410008, China;
3. Xiangya School of Medicine, Central South University, Changsha 410013, China）
Abstract:With elements of Zn and Ca as alloy components, three kinds of degradable ternary Mg-Zn-Ca alloys with Ca contents of 1%, 2% and 3%(mass fraction), respectively, were fabricated by melting and casting. The mass loss measurement and electrochemical corrosion technique were employed to study their corrosion behaviours in Hank’s simulated body fluid. The results based on the SEM morphology observation and analyses of structures and phases show that the corrosion of Mg alloy begins from pitting corrosion at Mg matrix. The ternary alloy with 1% Ca shows an enhanced corrosion resistance, and the existence and distribution of Mg2Ca phase in alloy significantly affect its corrosion-resisting performance. The content of Mg2Ca phase in alloy increases with the increase of Ca content, leading to a poor corrosion resistance for alloy.
Key words: Mg-Zn-Ca alloy; Hank solution; electrochemical corrosion; Mg2Ca phase; biodegradation
