硅酸钠溶液的模数对Zn-5%Al镀层上硅酸盐转化膜的影响

doi:10.11901/1005.3093.2017.372

材料研究学报

2018, Vol. 32

Issue (8): 607-615 DOI: 10.11901/1005.3093.2017.372

研究论文

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硅酸钠溶液的模数对Zn-5%Al镀层上硅酸盐转化膜的影响

许璐, 车淳山(

), 孔纲, 王彦启, 曹祖军

华南理工大学材料科学与工程学院广州 510640

Effect of Different Molar Ratio of SiO₂ to Na₂O on Silicate Conversion Film Prepared on Hot-dip Zn-5%Al Coating

Lu XU, Chunshan CHE(

), Gang KONG, Yanqi WANG, Zujun CAO

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

引用本文:

许璐, 车淳山, 孔纲, 王彦启, 曹祖军. 硅酸钠溶液的模数对Zn-5%Al镀层上硅酸盐转化膜的影响[J]. 材料研究学报, 2018, 32(8): 607-615.
Lu XU, Chunshan CHE, Gang KONG, Yanqi WANG, Zujun CAO. Effect of Different Molar Ratio of SiO₂ to Na₂O on Silicate Conversion Film Prepared on Hot-dip Zn-5%Al Coating[J]. Chinese Journal of Materials Research, 2018, 32(8): 607-615.

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摘要:

使用扫描电子显微镜(SEM)和能谱仪(EDS)、傅里叶变换红外吸收光谱 (FT-IR)、X射线光电子能谱 (XPS)等手段研究了经不同模数(SiO₂:Na₂O=2.0,3.0,3.5,4.0,4.5)硅酸钠溶液处理的热浸Zn-5%Al镀层表面硅酸盐转化膜的形貌和结构,并根据电化学交流阻抗(EIS)研究了膜层的耐蚀性。结果表明：与未处理的热浸镀Zn-5%Al试样相比,钝化后的试样耐蚀性有较大的提高,且模数为4.0时的膜层透明,表面均匀平整,膜层阻抗达到204.22 kΩ? cm²,耐蚀性最高;而模数为2.0时的膜层表面有较多的裂纹,耐蚀性最低。硅酸盐转化膜主要由硅酸锌、铝硅酸盐和二氧化硅、铝氧化物/氢氧化物、锌氧化物/氢氧化物组成,根据膜层分析对Zn-5%Al镀层硅酸盐转化膜的成膜机理进行了讨论。

关键词 ：材料表面与界面, 热浸镀Zn-5%Al, 转化膜, 硅酸盐, 耐蚀性能

Abstract：

Silicate conversion film was prepared on Zn-5%Al hot dip galvanized Q235 steel by dipping in sodium silicate solution with different molar ratio of SiO₂ to Na₂O in the range of 1.0-4.5. The surface morphology and microstructure, as well as the corrosion resistance of the conversion film were characterized by scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS), transmission infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), as well as electrochemical impedance spectroscopy (EIS). The results show that in the solution of molar ratio 4.0, the prepared film is uniform and smooth with the highest electrochemical impedance up to 204.22 kΩ?cm². However, the film formed in the solution of molar ratio 2.0 exhibits a large number of cracks, which presents the lowest corrosion performance. The silicate conversion film consists of zinc silicate, aluminosilicate, silicon dioxide, aluminum oxide/hydroxide and zinc oxide/hydroxide. Finally, the formation mechanism of silicate conversion film on the Zn-5%Al hot dip galvanized steel was also discussed.

Key words： surface and interface in the materials hot-dip Zn-5%Al conversion film silicate corrosion resistance

收稿日期: 2017-08-31

ZTFLH:

TB304

基金资助:资助项目国家自然科学基金 (21573077,51373055),国际铅锌研究组织(ILZRO/IZA/CN201212)

作者简介:

作者简介许璐,女,1993年生,硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.372 或 https://www.cjmr.org/CN/Y2018/V32/I8/607

图1 Zn-5%Al镀层和模数为2.0和4.0的硅酸盐转化膜的SEM形貌

表1 图1中各点的微区EDS分析结果

图2 试样M2和M4的XPS全谱图

图3 M2试样表面Na1s,O1s,Si2p以及M4试样表面Na1s,O1s,Si2p,Al2p,Zn2p的XPS高分辨谱图

图4 试样M2和M4的傅里叶变换红外吸收光谱

图5 Zn-5%Al与不同模数比的硅酸盐膜试样在5%NaCl溶液中的电化学交流阻抗谱

图6 电化学交流阻抗谱的等效拟合电路

表2 根据图6计算的Zn-5%Al及硅酸盐膜的等效元件的拟合参数

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