摘要
通过对纯镁进行不同电压参数的阳极氧化(5、10、20、40V),然后进行450℃高温退火处理,对镁表面氧化膜层进行优化。利用扫描电子显微镜分析膜层表面及截面形貌,用原子力显微镜分析三维结构及粗糙度,通过电化学极化实验与体外浸泡试验评估耐腐蚀性能,通过CCK-8试验评估对小鼠成骨细胞MC3T3-E1的增殖活性影响。结果表明,电压的升高可以使表面膜层从层板状变得多孔,继续升高电压又变得光滑均匀。退火处理维持了基本形貌特征,膜层厚度有所增加,粗糙度有所下降。未退火膜层由于微孔的存在以及氢氧化镁的不稳定导致耐腐蚀性能并未增高,退火所形成的致密氧化镁结晶膜层对基体有一定的保护作用,其中40 V氧化后退火组样品拥有相对较好的耐腐蚀性能,且对细胞增殖无明显抑制作用,具有良好的生物相容性。
The film on the magnesium surface was optimized by anodizing pure magnesium with different voltage parameters(5,10,20,40 V),and then annealing at 450°C.The surface and cross-section morphology of the formed coatings were analyzed by scanning electron microscopy.Three-dimensional structure and roughness were analyzed by atomic force microscope.The corrosion behavior of each group of samples was evaluated by electrochemical polarization experiments and in vitro immersion test.The proliferation activity of mouse osteoblasts MC3T3-E1 was evaluated by the CCK-8 method.The results show that the increase of voltage can make the surface film layer become porous from the lamellar shape,and then if the voltage continues to be increased,the layer becomes smooth and uniform.The annealing treatment maintains the basic morphological characteristics,the coating thickness increases and the roughness decreases.Due to the existence of micropores and the instability of magnesium hydroxide,the corrosion resistance of the unannealed film does not increase.The dense magnesium oxide crystal film formed by annealing has a certain protective effect to substrate,and the annealing group of the samples after 40 V oxidation is relatively good.which has a better corrosion resistance,biocompatibility and has no obvious inhibitory effect on cell proliferation.
作者
闫宁
宋文
张玉梅
Yan Ning;Song Wen;Zhang Yumei(State Key Laboratory of Military Stomatology,National Clinical Research Center for Oral Diseases,Shaanxi Key Laboratory of Stomatology,School of Stomatology,The Fourth Military Medical University,Xi'an 710032,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第6期2168-2174,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金重点项目(81530051,31670966,31800790)
陕西省重点研发计划(2019SF-031)。
关键词
镁
阳极氧化膜层
退火
结构
耐腐蚀性
生物相容性
magnesium
anodized film
annealing
structure
corrosion resistance
biocompatibility
