硅溶胶改性水性丙烯酸树脂对镀锌三价铬钝化膜的封闭作用

doi:10.11868/j.issn.1001-4381.2016.001247

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摘要

为提高镀锌三价铬钝化膜的耐腐蚀性能，研究硅溶胶改性水性丙烯酸树脂对镀锌三价铬钝化膜的封闭效果。通过Tafel极化曲线、电化学交流阻抗谱（EIS）、盐水浸泡实验和中性盐雾实验（NSS）测试镀锌钝化膜封闭后的耐腐蚀性能和200℃高温处理后的热稳定性，采用SEM，FT-IR及TGA对封闭膜层的形貌及特性进行表征。结果表明：与未改性和未封闭的镀锌钝化膜相比，硅溶胶改性的镀锌钝化封闭剂可以显著提高钝化膜的阻抗值，有效减缓镀锌钝化膜在盐水中的腐蚀速率，延长耐盐雾腐蚀时间，且硅溶胶的引入可以显著提高镀锌钝化膜封闭后的耐热性能。

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	孙伟
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	刘慧丛

关键词 ：镀锌钝化膜, 水性丙烯酸树脂, 硅溶胶改性, 耐腐蚀性能, 封闭

Abstract：

In order to improve the corrosion resistance of the trivalent chromium passivation film on galvanized steel, the effects of silica sol modified waterborne acrylic resin on the passivation film were studied. The corrosion resistance and the thermal stability of the passivation film were measured by Tafel polarization curve, electrochemical impedance spectroscopy (EIS), salt water immersion test and neutral salt spray test (NSS), and the morphology and properties of the film were characterized by SEM, FT-IR and TGA. The results show that compared with the unmodified and unsealed passivation film on galvanized steel, silica sol modified sealant can significantly improve the resistance of the passivation film, effectively slow down the corrosion rate of the passivation film in 3.5%NaCl solution, and extend the enduring time under salt spray test; and the heat resistance of the passivation film can be improved remarkably by the introduction of silica sol.

Key words： passive film on galvanized steel waterborne acrylic resin silica sol modified corrosion resistance sealing

收稿日期: 2016-10-18 出版日期: 2018-12-18

中图分类号:

TG178

基金资助:国家自然科学基金(51401011)

通讯作者: 刘慧丛 E-mail: liuhc@buaa.edu.cn

作者简介: 刘慧丛(1975-), 女, 副教授, 博士, 从事功能性材料及涂镀层的腐蚀与防护研究, 联系地址:北京市海淀区学院路37号北京航空航天大学材料科学与工程学院(100191), E-mail:liuhc@buaa.edu.cn

引用本文:

孙伟, 朱立群, 李卫平, 刘慧丛. 硅溶胶改性水性丙烯酸树脂对镀锌三价铬钝化膜的封闭作用[J]. 材料工程, 2018, 46(12): 110-116.
Wei SUN, Li-qun ZHU, Wei-ping LI, Hui-cong LIU. Sealing Effects of Silica Sol Modified Waterborne Acrylic Resin on Chromium Trivalent Passivation Film of Galvanized Steel. Journal of Materials Engineering, 2018, 46(12): 110-116.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.001247 或 http://jme.biam.ac.cn/CN/Y2018/V46/I12/110

Fig.1 不同封闭状态的镀锌钝化试件在3.5%NaCl水溶液中的Tafel极化曲线

Table 1 不同封闭状态的镀锌钝化试件在3.5%NaCl水溶液中的自腐蚀电位与腐蚀电流密度

Fig.2 不同封闭状态的镀锌钝化试件在3.5%NaCl水溶液中的交流阻抗谱及拟合图

Fig.3 丙烯酸树脂封闭镀锌钝化膜的EIS分析等效电路图

Table 2 电化学阻抗谱参数拟合结果

Fig.4 不同封闭状态的镀锌钝化试样在3.5%NaCl水溶液中的浸泡腐蚀速率

Table 3 不同封闭状态的镀锌钝化试件耐中性盐雾实验时间(h)

Fig.5 不同封闭状态镀锌钝化膜高温处理前后的SEM照片
(a)未封闭；(b)PAC封闭；(c)Si-PAC封闭; (1)高温处理前; (2)高温处理后

Table 4 不同封闭状态的镀锌钝化膜层表面元素含量

Fig.6 红外吸收光谱图

Fig.7 封闭膜层TG曲线

Table 5 PAC与Si-PAC在高温处理前后的交联度(%)

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