纯镁表面硬脂酸自组装膜处理工艺及其性能  

Technology and performance of stearic acid SAMs on pure magnesium

作　　者：乔丽英[1] 高家诚[1] 王勇[1] 谢奉妤[1] 胡德[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2013年第7期74-78,共5页Journal of Chongqing University

基　　金：中央高校基本科研业务费面上项目(CDJZR10130014)

摘　　要：为改善镁金属在生理环境中的腐蚀行为与生物活性,采用硬脂酸对纯镁表面进行有机自组装膜改性研究。有机改性前,先对试样进行3种不同的前处理:酸碱处理、热处理和碱热处理;通过正交试验优选最佳的预处理方法、硬脂酸溶液浓度和处理时间。对不同预处理和硬脂酸改性后的试样进行电化学行为分析,并对最佳工艺改性前后的试样进行了静态水接触角的测量及仿生溶液(SBF)浸泡试验分析,跟踪测试SBF溶液的pH值及镁离子浓度变化,利用扫描电子显微镜(SEM-EDS)观察SBF中浸泡后的试样表面形貌,并分析其表面成分。试验结果表明:以热处理为前预理方式,在0.5mol/L硬脂酸乙醇溶液中浸泡1.5h的试样耐蚀性最优,该膜层改变了材料表面的润湿性,使其与水的接触角增大,并明显降低了材料的腐蚀速度及提高了其生物活性。The surface-treatment of self-assembled monolayer（SAMs）of stearic acid on pure magnesium is studied to improve the bioactivity and corrosion resistance of pure Mg.Three pre-treatment methods（HCl-NaOH treatment,alkali-heat treatment and heat treatment）are used before SAMs treatment is carried out in stearic acid.The orthogonal test is performed to select the best pre-treatment method,concentration of solution and soaking time.The electrochemical properties of samples with different pre-treatment are tested.The water contact angles of samples with and without SAMs treatment are studied.Samples are also immersed in simulated body fluid（SBF）,the pH varieties of the solution and the concentration of Mg ion in SBF is tested to evaluate the corrosion resistance of SAMs,and surface morphology and composition analysis of samples are characterized by the scanning electron microscope with energy dispersive spectrometer（SEM-EDS）.The results show that the sample with heat pre-treatment soaked into 0.5 mol/L stearic acid/ethanol solution for 1.5 hours has the best corrosion resistance.SAMs change the hydrophilic nature of samples and the contact angle with water significantly increases.Also SAMs decrease the corrosion rate of magnesium and samples with SAMs show better bioactivity than untreated magnesium.

关 键 词：纯镁 硬脂酸 自组装 腐蚀性能 生物活性 

分 类 号：TG146[一般工业技术—材料科学与工程]