水热溶液pH值对AZ91D镁合金表面珍珠质涂层性能的影响  

Influence of Hydrothermal Solution pH Value on Properties of Pearl Coating on AZ91D Mg Alloy

作　　者：俞丹 何美凤[1] 王浩[1] 王帅[1] 范宝中 苑承功 YU Dan;HE Mei-feng;WANG Hao;WANG Shuai;FAN Bao-zhong;YUAN Cheng-gong(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料科学与工程学院

出　　处：《表面技术》2019年第12期94-101,共8页Surface Technology

基　　金：国家自然科学基金(51771120,51304136);上海市科技支撑项目(16060502400)~~

摘　　要：目的研究水热溶液pH值对AZ91D合金基体上珍珠质涂层的成分、形貌、抗腐蚀能力以及细胞相容性的影响。方法使用不同pH条件下(5.8、7、8.8、11.8)的水热反应溶液,在AZ91D基体上水热合成珍珠质涂层。利用XRD、XPS和SEM分析涂层的化学成分以及微观形貌。用电化学测量系统评估材料在模拟体液(Simulated Body Fluid,SBF)中的开路电位和极化曲线。通过细胞计数试剂盒(CCK-8法)和拍摄细胞荧光照片,来检测珍珠质涂层的细胞相容性。结果珍珠质涂层的成分和形貌会随着水热反应溶液pH值的不同而发生明显的变化。电化学腐蚀试验证实,与空白对照试样相比,沉积有珍珠质涂层的样品的OCP值较高,其Jcorr值也减少了近10倍,Ecorr值向正电位方向移动。此外,弱碱性条件下所沉积涂层的耐蚀性最优,其Ecorr(vs.SCE)值提高了0.16V,Jcorr值降低了8.16×10^-5A/cm^2。细胞相容性测试结果表明,珍珠质涂层不具有毒性,珍珠粉原材料为涂层提供的大量骨生长因子,能够促进成骨细胞的增殖。结论采用水热反应法,成功地在AZ91D合金基体上制得珍珠质涂层,该涂层可以有效地改善镁合金在人体中的耐蚀性和生物相容性。The work aims to study the influence of hydrothermal solution pH value on the composition,morphology,corrosion resistance and cell compatibility of the pearl coating on the AZ91 D alloy substrate.The pearl coatings were hydrothermally synthesized on the AZ91 D substrate by hydrothermal reaction solutions at different pH values(5.8,7,8.8,11.8).The chemical composition and micromorphology of the pearl coatings were analyzed by XRD,XPS and SEM.The open circuit potential and polarization curves of the materials in simulated body fluid(SBF)were evaluated by an electrochemical measurement system.The cell compatibility of the coatings was examined by cell counting kit-8(CCK-8 method)and cell fluorescence photographs.With the change of the hydrothermal reaction solution pH value,the composition and morphology of the pearl coatings varied significantly.The electrochemical corrosion test confirmed that the samples deposited with the pearl coating had higher OCP values,the Jcorr values were reduced by nearly 10 times,and the Ecorr values shifted in the positive potential direction compared with the blank control sample.In addition,the coatings deposited under the weak alkaline conditions had the best corrosion resistance,the Ecorr(vs.SCE)value was increased by 0.16 V,and the Jcorr value was reduced by 8.16×10^-5 A/cm^2.Cytocompatibility test results showed that the pearl coatings were non-toxic,and the large amounts of bone growth factors provided by the pearl powder raw material could promote the proliferation of osteoblasts.The pearl coating is successfully prepared on the AZ91 D alloy substrate by hydrothermal reaction method and can effectively improve the corrosion resistance and biocompatibility of the magnesium alloy in the human body.

关 键 词：镁合金 水热法 珍珠质涂层 开路电位 极化曲线 细胞相容性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]