Effect of solution pH on stress corrosion cracking behavior of modified AZ80 magnesium alloy in simulated body fluid
Effect of solution pH on stress corrosion cracking behavior of modified AZ80 magnesium alloy in simulated body fluid
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溶液pH值对改性AZ80镁合金在模拟体液中应力腐蚀开裂行为的影响
DOI：
10.1016/j.matchemphys.2021.124232
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发表时间：
2021-03
影响因子：
4.6
通讯作者：
Song Renguo
中科院分区：
文献类型：
--
作者：
He Liuyong;Yang Jie;Xiong Ying;Song Renguo
镁及其合金作为生物可降解材料广泛应用于骨科领域。然而，镁合金在生理环境中的耐腐蚀性差，在很大程度上限制了其在医用植入物中的应用。本研究采用微弧氧化（MAO）和激光冲击/微弧氧化复合技术（LSP/MAO）对AZ 80镁合金进行表面改性。在不同pH值（4、7.4和9）的模拟体液（SBF）中，以5.3 × 10−7s−1的应变速率对未处理（BM）和处理（MAO和LSP/MAO）样本进行慢应变速率拉伸（SSRT）测试。利用扫描电镜（SEM）观察了腐蚀后试样的断口形貌.用能谱仪（EDS）对腐蚀表面进行了元素分析。通过电化学测试研究了不同试样的耐腐蚀性能。结果表明，微弧氧化试样本身在pH 7.4的模拟体液中具有最好的抗应力腐蚀开裂（SCC）性能，在pH 4的模拟体液中最差。在不同pH值的模拟体液中，LSP/MAO试样的抗SCC性能优于MAO试样。激光冲击/微弧氧化复合涂层能有效提高AZ 80镁合金的耐蚀性和力学性能，有助于延长镁合金植入物的使用寿命，促进镁合金在医疗和工业领域的发展。在不同pH值的模拟体液中对三种试样的应力腐蚀开裂机理进行了评价。
Magnesium (Mg) and its alloys are widely used as biodegradable materials in orthopedic applications. However, the poor corrosion resistance of Mg alloys in physiological environments largely limits their application in medical implants. In this study, the surface of AZ80 Mg alloy were modified by two treatment methods, micro-arc oxidation (MAO) and the composition of laser shock penning/micro-arc oxidation technology (LSP/MAO). Slow strain rate tensile (SSRT) testing was performed on untreated (BM) and treated (MAO and LSP/MAO) specimens in simulated body fluid (SBF) with various pH values (4, 7.4, and 9) at a strain rate of 5.3 × 10−7s−1. The scanning electron microscopy (SEM) was used to observe the fracture morphology of corroded specimen. The energy-dispersive X-ray spectroscopy (EDS) was used to analyses elements on corroded surface. The corrosion resistance of different specimens was investigated by electrochemical testing. The results indicated that the MAO specimen itself had the best stress corrosion cracking (SCC) resistance in pH 7.4 SBF, and the worst in pH 4 SBF. The LSP/MAO specimen possessed superior SCC resistance to MAO specimen in SBF with various pH values. The LSP/MAO composite coating can effectively improve the corrosion resistance and mechanical properties of AZ80 Mg alloy, which helps to extend the service life of Mg alloy implants and promote the development of Mg alloys in medical and industrial fields. The SCC mechanisms of three specimens were evaluated in SBF with various pH values.
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