孙俊丽,李思远,许恒旭,侯利锋,杜华云,刘宝胜,卫英慧.镁合金表面缓蚀剂插层LDHs膜的制备及其自愈合性能研究[J].稀有金属材料与工程,2020,49(12):4236~4245.[Sun Junli,Li Siyuan,Xu Hengxu,Hou Lifeng,Du Huayun,Liu Baosheng,Wei Yyinghui.Effect of anion exchange on self-healing properties of magnesium-aluminum LDHs film on the magnesium alloys[J].Rare Metal Materials and Engineering,2020,49(12):4236~4245.]
镁合金表面缓蚀剂插层LDHs膜的制备及其自愈合性能研究
投稿时间:2020-03-28  修订日期:2020-05-08
中文关键词:  镁合金  LDHs  离子交换  耐蚀性  自愈合
基金项目:山西省基地平台项目(201805D121003)、中央引导地方科技发展资金项目和山西省科技重大专项(20191102006)
中文摘要:
      本文通过水热法在AZ31镁合金表面原位合成层状双氢氧化物膜层MgAl-LDHs-NO3,采用阴离子交换反应将钨酸根阴离子(WO42-)和半胱氨酸(Cys)阴离子嵌入LDHs层间,制得MgAl-LDHs-WO4和MgAl-LDHs-Cys。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、电化学阻抗测试(EIS)研究了膜层的形貌、结构、耐蚀性和自愈合性能。结果表明,在3.5wt.%NaCl溶液中三种膜层的耐蚀性由大到小依次为LDHs-WO4>LDHs-Cys>LDHs-NO3。预制划痕后在3.5wt.%NaCl溶液中浸泡实验表明,三种膜层均表现出良好的自愈合能力,电化学结果显示浸泡8天时耐蚀性最佳,随后呈下降趋势,且LDHs-WO4和LDHs-Cys自愈合能力明显优于LDHs-NO3。这是由于LDHs-WO4和LDHs-Cys含有缓蚀性阴离子,膜层不仅阻隔溶液对基体的腐蚀,而且LDHs的层间结构还可以释放缓蚀性离子,这些离子与镁结合形成难溶沉淀,促进膜层的自愈合过程。
Effect of anion exchange on self-healing properties of magnesium-aluminum LDHs film on the magnesium alloys
英文关键词:Magnesium alloy  LDHs  Anion exchange  Corrosion resistance  Self-healing
英文摘要:
      In this paper, a layered double hydroxide film layer MgAl-LDHs-NO3 was synthesized by hydrothermal method. Tungstate anions (WO42-) and Cysteine(Cys) anions were intercalated into the LDHs interlayer by virtue of the anion exchange reaction to acquire MgAl-LDHs-WO4 and MgAl-LDHs-Cys films. X-ray diffraction (XRD), scanning electron microscope (SEM), Energy spectrometer (EDS), and electrochemical impedance test (EIS) were performed to study the morphology, structure, corrosion resistance and self-healing performance. The results showed that the corrosion resistance were in the sequence of LDHs-WO4>LDHs-Cys>LDHs-NO3.All of three film were of effectively self-healing ability. Electrochemical results showed that the films induced to the scratch treatment have better corrosion resistance after immersed in 3.5 wt.% NaCl solution for 8 days, and then showed a downward trend. .Compared to MgAl-LDHs, LDHs-WO4 and LDHs-Cys, contained corrosion inhibiting anions, were displayed the better self-healing ability, due to the film layer could not only capture Cl-, but also release corrosion-inhibiting anions.
作者单位E-mail
孙俊丽 太原理工大学 材料科学与工程学院 649063290@qq.com 
李思远 太原理工大学 材料科学与工程学院  
许恒旭 太原理工大学 材料科学与工程学院  
侯利锋 太原理工大学 材料科学与工程学院  
杜华云 太原理工大学 材料科学与工程学院  
刘宝胜 太原理工大学 材料科学与工程学院  
卫英慧 太原理工大学 材料科学与工程学院  
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