钼酸盐插层锌铝铈水滑石的制备与缓蚀性能研究

doi:10.11902/1005.4537.2016.186

中国腐蚀与防护学报

2016, Vol. 36

Issue (6): 637-644 DOI: 10.11902/1005.4537.2016.186

研究报告

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钼酸盐插层锌铝铈水滑石的制备与缓蚀性能研究

王吉会(

),闫华杰,胡文彬

天津大学材料科学与工程学院天津 300350

Preparation and Inhibition Behavior of Molybdate Intercalated ZnAlCe-hydrotalcite

Jihui WANG(

),Huajie YAN,Wenbin HU

School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China

全文: PDF(809 KB) HTML

摘要:

利用水热法合成了钼酸盐插层锌铝铈水滑石 (ZnAlCe-MoO₄LDH),并通过单因素试验和正交试验对水热合成过程中的n(Al³⁺)/n(Ce³⁺) 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-MoO₄LDH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-MoO₄LDH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-MoO₄ LDH呈片层状,片层厚度约为30 nm;ZnAlCe-MoO₄ LDH的最佳制备工艺条件为：n(Al³⁺)/n(Ce³⁺) 摩尔比6:1,反应温度60 ℃,陈化温度100 ℃。ZnAlCe-MoO₄LDH对碳钢在3.5%NaCl溶液中的缓蚀作用,一方面体现在ZnAlCe-MoO₄LDH层板间的MoO₄^2-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MoO₄^2-会与Fe²⁺和Fe³⁺形成钼酸盐钝化膜,且层板上释放出的Zn²⁺和Ce³⁺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。

关键词 ：水滑石, 缓蚀剂, 正交试验, 碳钢, 海水

Abstract：

Molybdate intercalated ZnAlCe-hydrotalcite (ZnAlCe-MoO₄ LDH) was synthesized by using solvothermal method, and the preparation parameters such as n(Al³⁺)/n(Ce³⁺) ratio, reaction temperature and crystallization temperature were optimized by single factor and orthogonal experiments. The surface morphology and structure of the prepared ZnAlCe-MoO₄ LDH were characterized by SEM, XRD and FT-IR methods. The inhibition behavior of ZnAlCe-MoO₄ LDH for Q235 steel in 3.5%(mass fraction) NaCl solution were investigated by EIS and XPS. Results show that the synthesized ZnAlCe-MoO₄ LDH presents laminar microstructure with the thickness of 30 nm. The optimum preparation conditions are n(Al³⁺)/n(Ce³⁺) ratio of 6:1, reaction temperature of 60 ℃and crystallization temperature of 100 ℃. The inhibition effect of ZnAlCe-MoO₄ LDH on the corrosion of Q235 steel in 3.5%NaCl solution may be ascribed to the reduction of chloride concentration in 3.5%NaCl solution owing to the anion exchange with molybdate, the formation of passive film with the composition of ferrous or iron molybdate and the deposition of film consisted of zinc and cerium hydroxides.

Key words： layered double hydroxide inhibitor orthogonal experiment carbon steel seawater

基金资助:国家自然科学基金项目 (51471117) 和国家重点基础研究发展计划项目 (2014CB046801) 资助

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引用本文:

王吉会,闫华杰,胡文彬. 钼酸盐插层锌铝铈水滑石的制备与缓蚀性能研究[J]. 中国腐蚀与防护学报, 2016, 36(6): 637-644.
Jihui WANG, Huajie YAN, Wenbin HU. Preparation and Inhibition Behavior of Molybdate Intercalated ZnAlCe-hydrotalcite. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 637-644.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.186 或 https://www.jcscp.org/CN/Y2016/V36/I6/637

表1 ZnAlCe-MoO4 LDH材料的正交试验设计与缓蚀率

图1 单因素试验条件下ZnAlCe-MoO4 LDH的缓蚀率与 n(Al3+)/n(Ce3+) 摩尔比、反应温度和陈化温度的变化关系

表2 ZnAlCe-MoO4 LDH缓蚀率的极差分析

图2 正交试验条件下ZnAlCe-MoO4 LDH的缓蚀率与n(Al3+)/n(Ce3+) 摩尔比, 反应温度和陈化温度的变化关系

图3 ZnAlCe-MoO4 LDH的表面形貌和EDS结果

图4 ZnAlCe-MoO4LDH的XRD谱

图5 ZnAlCe-MoO4 LDH的红外吸收光谱

图6 Q235钢在3.5%NaCl和3.5%NaCl+2 g/L ZnAlCe-MoO4 LDH溶液中腐蚀后的表面形貌

图7 经3.5%NaCl溶液腐蚀后Q235钢表面腐蚀产物的XPS谱

图8 Q235钢经3.5%NaCl+2 g/L ZnAlCe-MoO4 LDH溶液腐蚀后表面的XPS谱

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