镀锌层三价铬钝化成膜过程及耐蚀性研究

doi:10.11902/1005.4537.2016.138

中国腐蚀与防护学报

2017, Vol. 37

Issue (6): 547-553 DOI: 10.11902/1005.4537.2016.138

研究报告

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镀锌层三价铬钝化成膜过程及耐蚀性研究

严寒¹, 赵晴¹(

), 杜楠¹, 胡彦卿², 王力强², 王帅星¹

1 南昌航空大学轻合金加工科学与技术国防重点学科实验室南昌 330063
2 成都飞机工业 (集团) 有限责任公司制造工程部成都 610092

Formation Process and Corrosion Resistance of Trivalent Chromium Passivation Film on Zn-plated Q235 Steel

Han YAN¹, Qing ZHAO¹(

), Nan DU¹, Yanqing HU², Liqiang WANG², Shuaixing WANG¹

1 National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
2 Chengdu Aircraft Industrial (Group) Co. Manufacture and Engineer Department, Chengdu 610092, China

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摘要:

采用浸泡法在Q235钢镀锌层表面制备三价铬钝化膜,借助扫描电镜 (SEM) 和X射线光电子能谱 (XPS) 分析了钝化膜的表面结构与成膜过程。通过Tafel曲线、电化学阻抗谱和中性盐雾实验 (NSS) 结果评定钝化膜的耐蚀性。结果表明,镀锌层表面光滑均匀、结构致密,无明显裂纹;钝化膜表面平整,散乱且无规律分布着大量裂纹;钝化膜主要含有Cr、O、Zn和少量的P、N等元素,并以Cr(OH)₃、Zn(OH)₂、Cr₂O₃和ZnO等化合物的共混物形式存在。钝化膜的形成过程包括镀锌层的溶解、钝化膜的生长和溶解及钝化膜的干燥3个步骤。盐雾实验表明经过三价铬钝化后的镀锌件耐蚀性提高近7倍。

关键词 ：镀锌, 三价铬, 钝化膜, 耐蚀性

Abstract：

The trivalent chromium passivation film on the surface of Zn-plated Q235 steel was fabricated by immersion method. The microstructure and corrosion performance of the passivation film were studied by means of scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), as well as polarization curve measurement, electrochemical impedance spectroscopy (EIS) and neutral salt spray (NSS) test, respectively. The results show that the Zn-coating is compact without obvious cracks but with excellent anticorrosion performance. The trivalent chromium passivation film on Zn-coating has smooth surface with a large number of cracks. The major constituents of the trivalent chromium passivation film were Zn, Cr and O, while a small amount of P and N was also detected, which probably in the form of compounds such as Cr(OH)₃, Zn(OH)₂, Cr₂O₃, and ZnO. The forming process of passivation film possibly consists of three steps such as zinc dissolution, passivation film forming and dissolution, and finally drying to become passivation film. It is noted through NSS test that the trivalent chromium passivation film can enhance the corrosion resistance of Zn-coating by c.a. 7 times．

Key words： Zn plating trivalent chromium passivation film corrosion resistance

收稿日期: 2016-08-31

ZTFLH:

TG174.3

作者简介:

作者简介严寒,女,1991年生,硕士生

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引用本文:

严寒, 赵晴, 杜楠, 胡彦卿, 王力强, 王帅星. 镀锌层三价铬钝化成膜过程及耐蚀性研究[J]. 中国腐蚀与防护学报, 2017, 37(6): 547-553.
Han YAN, Qing ZHAO, Nan DU, Yanqing HU, Liqiang WANG, Shuaixing WANG. Formation Process and Corrosion Resistance of Trivalent Chromium Passivation Film on Zn-plated Q235 Steel. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 547-553.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.138 或 https://www.jcscp.org/CN/Y2017/V37/I6/547

图1 镀锌层及镀锌钝化层表面形貌

图2 镀锌三价铬钝化膜表面形貌、截面形貌及EDS结果

图3 镀锌三价铬钝化膜表面的XPS谱

图4 镀锌三价铬钝化膜的XPS精细谱

图5 镀锌三价铬钝化时间-电位曲线

表1 Cr3p 和O1s的XPS精细谱拟合结果

表2 镀锌层及镀锌钝化层在3.5%NaCl溶液的Tafel曲线拟合数据

图6 镀锌层及镀锌钝化层在3.5%NaCl溶液中的Tafel曲线

图7 镀锌层及镀锌钝化层在3.5%NaCl溶液中的电化学阻抗图

图8 镀锌层与镀锌钝化膜电化学阻抗谱的拟合电路图

表3 镀锌层与镀锌钝化膜电化学阻抗谱拟合参数

表4 镀锌层和镀锌钝化膜试样的盐雾实验结果

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