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材料研究学报  2014, Vol. 28 Issue (7): 521-527    DOI: 10.11901/1005.3093.2014.123
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热浸镀锌层钛盐转化膜的制备和耐蚀性能*
许乔瑜(),王海霞,姜瑞
华南理工大学材料科学与工程学院 广州 510640
Formation and Corrosion Resistance of Titanium Containing Conversion Film on Hot-dip Galvanized Steel
Qiaoyu XU(),Haixia WANG,Rui JIANG
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640
引用本文:

许乔瑜,王海霞,姜瑞. 热浸镀锌层钛盐转化膜的制备和耐蚀性能*[J]. 材料研究学报, 2014, 28(7): 521-527.
Qiaoyu XU, Haixia WANG, Rui JIANG. Formation and Corrosion Resistance of Titanium Containing Conversion Film on Hot-dip Galvanized Steel[J]. Chinese Journal of Materials Research, 2014, 28(7): 521-527.

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摘要: 

制备了热浸锌层钛盐转化膜, 采用SEM、EDS表征了转化膜的表面形貌、化学成分, 采用XPS技术分析了膜层的组成, 探讨了膜层的生长过程。通过中性盐雾试验、电化学极化分析和电化学阻抗研究了膜层的耐蚀性能。结果表明, 膜层主要由含结晶水的Ti(OH)4/TiO2和Zn(OH)2/ZnO组成, 随着处理时间的增加钛盐转化膜逐渐增厚, 膜层中的Ti含量逐渐增加。与未经处理的热浸镀锌层比较, 转化膜层腐蚀电流密度减小, 极化电阻和电化学阻抗显著增大, 耐蚀性明显增强。

关键词 材料失效与保护热浸镀锌转化膜钛盐耐蚀性能    
Abstract

A Ti containing conversion film on hot-dip galvanized steel was prepared by chemical conversion in titanium sulfate solution. The surface morphology, chemical composition and ingredients of the film were characterized by means of SEM, EDS and XPS. Then the corrosion resistance of the galvanized steel coated with Ti containing conversion film was examined by NSS test, electrochemical polarization and electrochemical impedance spectroscopy (EIS). The results show that the Ti containing conversion film gradually thickens and the Ti content of the film increases with the increasing time in the solution; the film mainly consists of Ti(OH)4/TiO2 and Zn(OH)2/ZnO. In comparison with the blank galvanized steel, the corrosion current density decreases, the polarization resistance and the electrochemical impedance increase significantly for the galvanized steel with Ti containing conversion film on top. The Ti containing conversion films enhance the corrosion resistance significantly, among them a film prepared in the solution for 10 min exhibits the highest corrosion resistance.

Key wordsmaterials failure and protection    hot-dip galvanizing    conversion film    titanium    corrosion resistance
收稿日期: 2014-03-18     
基金资助:* 广东省教育部产学研结合项目2012B091100312和中央高校基本科研业务费专项资金2012ZM0011资助。
图1  钛盐转化膜生长的微观形貌
Fig. Treat time/min Micro-site Zn O Ti
Fig.1a 1 surface 88.62 10.69 0.69
Fig.1b 10 surface 79.69 15.84 4.47
Fig.1c 30 surface 71.92 20.36 7.72
Fig.1d 60 surface 64.56 25.23 10.21
Fig.1d 60 crack 85.44 9.50 5.06
表1  图1对应的各微区的化学成分
图2  处理10 min的钛盐转化膜的XPS全谱图
Element Zn O Ti
Atomic fraction, % 12.727 78.020 9.253
Mass fraction, % 32.380 49.544 17.626
表2  处理10 min 的钛盐转化膜层表面成分的XPS 分析结果
图3  钛盐转化膜的XPS解析图
图4  25℃腐蚀-免蚀-钝化条件图
图5  HDG和不同处理时间的钛盐转化膜的NSS结果
图6  HDG和不同处理时间的钛盐转化膜在5%NaCl溶液中的极化曲线
Sample Ecorr/V Rp/kΩcm2 Jcorr/μAcm2
HDG -1.095 1.043 9.020
1 min -1.035 4.469 1.434
10 min -1.078 46.90 0.202
30 min -1.099 24.79 0.348
60 min -1.116 5.255 1.639
表3  图6 极化曲线的相关电化学参数
图7  HDG和不同处理时间的钛盐转化膜在5%NaCl溶液中的电化学阻抗谱
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