钼酸盐插层锌铝铈水滑石的制备与缓蚀性能研究

发布时间：2018-04-10 02:28

本文选题：水滑石　切入点：缓蚀剂　出处：《中国腐蚀与防护学报》2016年06期

【摘要】：利用水热法合成了钼酸盐插层锌铝铈水滑石(ZnAlCe-MoO_4 LDH),并通过单因素试验和正交试验对水热合成过程中的n(Al~(3+))/n(Ce~(3+))摩尔比、反应温度、陈化温度等工艺参数进行了优化。利用扫描电镜、X射线衍射仪、红外光谱等对ZnAlCe-MoO_4LDH的形貌和结构进行了表征,并通过电化学阻抗谱、X射线光电子能谱等技术研究了ZnAlCe-MoO_4LDH对Q235碳钢在3.5%(质量分数)NaCl溶液中的缓蚀性能和缓蚀机制。结果表明,合成的ZnAlCe-MoO_4LDH呈片层状,片层厚度约为30 nm;ZnAlCe-MoO_4LDH的最佳制备工艺条件为:n(Al~(3+))/n(Ce~(3+))摩尔比6∶1,反应温度60℃,陈化温度100℃。ZnAlCe-MoO_4LDH对碳钢在3.5%NaCl溶液中的缓蚀作用,一方面体现在ZnAlCe-MoO_4LDH层板间的MoO_4~(2-)会与溶液中的Cl~-发生离子交换,降低了溶液中的Cl~-含量;另一方面释放到溶液中的MoO_4~(2-)会与Fe~(2+)和Fe~(3+)形成钼酸盐钝化膜,且层板上释放出的Zn~(2+)和Ce~(3+)会与OH~-形成氢氧化物沉积膜,从而减缓了Q235钢在3.5%NaCl溶液中的腐蚀速率。
[Abstract]:Molybdate intercalated zinc-aluminum-cerium hydrotalcite (ZnAlCe-MoO4LDHN) was synthesized by hydrothermal method. The technological parameters such as the molar ratio of n(Al~(3 / nCe-Moo _ 4LDH _ 4 during hydrothermal synthesis, reaction temperature and aging temperature were optimized by single factor test and orthogonal test.The morphology and structure of ZnAlCe-MoO_4LDH were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD).The corrosion inhibition and corrosion inhibition mechanism of Q235 carbon steel in 3.5% (mass fraction) NaCl solution were studied by electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS).On the one hand, Moo _ 4C _ 2), which is reflected in the ZnAlCe-MoO_4LDH laminate, will exchange with the Cl-ion in the solution, which reduces the Cl-content in the solution; on the other hand, the Moo _ 4T _ 2) released into the solution will form molybdate passivation film with Fe~(2) and Fe~(3).Moreover, Zn~(2) and Ce~(3) released on the laminates will form hydroxide deposition films with OH-, thus slowing down the corrosion rate of Q235 steel in 3.5%NaCl solution.
【作者单位】：天津大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51471117) 国家重点基础研究发展计划项目(2014CB046801)资助
【分类号】：TG174.42

【相似文献】