School of Material science and Engineering, Lanzhou University of Technology, Lanzhou, China.
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, China.
J Appl Biomater Funct Mater. 2020 Jan-Dec;18:2280800019887906. doi: 10.1177/2280800019887906.
Fast degradation rate and inhomogeneous corrosion are obstacles for magnesium alloy bio-corrosion properties. In this paper, a quaternary Mg-Zn-Ca-Mn alloy was designed by an orthogonal method and prepared by vacuum induction melting to investigate its bio-corrosion. Microstructure, corrosion morphology, and bio-corrosion properties of as-cast alloys 1 to 5 with good corrosion resistance were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction with immersion and electrochemical tests in simulated body fluid (SBF), respectively. Both the orthogonal method and in vitro degradation experiments demonstrated that alloy 3 exhibited the lowest degradation rate among the tested quaternary Mg-Zn-Ca-Mn alloys. Then, as-cast alloy 3 was treated by solid-solution and solid-solution aging. In vitro experimental results indicated that as-cast alloy 3 showed better corrosion resistance than heat-treated specimens and the average corrosion rate was approximately 0.15 mm/y. Heat-treated alloy 3 exhibited more uniform corrosion than as-cast alloy specimens. These results suggest that alloy 3 has the potential to become a biodegradable candidate material.
快速降解率和不均匀腐蚀是镁合金生物腐蚀性能的障碍。本文通过正交法设计了一种四元 Mg-Zn-Ca-Mn 合金，并通过真空感应熔炼进行制备，以研究其生物腐蚀性能。通过扫描电子显微镜、能谱仪、X 射线衍射和浸泡及电化学试验，对耐腐蚀性能良好的 1 号至 5 号铸态合金的微观组织、腐蚀形貌和生物腐蚀性能进行了表征。正交试验法和体外降解实验结果均表明，在测试的四元 Mg-Zn-Ca-Mn 合金中，合金 3 的降解速率最低。然后，对铸态合金 3 进行固溶和固溶时效处理。体外实验结果表明，铸态合金 3 的耐腐蚀性优于热处理试样，平均腐蚀速率约为 0.15mm/y。热处理合金 3 的腐蚀比铸态合金试样更均匀。这些结果表明，合金 3 具有成为可生物降解候选材料的潜力。
