HAN Jingjing,DOU Guotao *.Preparation and Properties of Different Lanthanum Salt Conversion Films on Hot Galvanized Plate for Construction[J].Plating & Finishing,2022,(2):1-6.[doi:doi： 10.3969/j.issn.1001-3849.2022.02.001]
建筑用热镀锌板表面不同镧盐转化膜的制备与性能
- Title:
- Preparation and Properties of Different Lanthanum Salt Conversion Films on Hot Galvanized Plate for Construction
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 分别采用常规镧盐处理液、含有柠檬酸的改进镧盐处理液对建筑用热镀锌板进行化学转化处理，制备了常规镧盐转化膜、改进镧盐转化膜。测试并比较了不同镧盐转化膜的结合力、形貌、成分和耐腐蚀性能。结果表明：常规镧盐转化膜和改进镧盐转化膜都由 Zn 、 La 、 C 和 O 元素组成，与热镀锌板结合较好，并且都能抑制热镀锌板腐蚀。与常规镧盐转化膜相比，改进镧盐转化膜表面裂缝得到修复，其致密性以及对热镀锌板表面覆盖均匀性较好，耐醋酸铅点蚀时间延长了约 20 s ，腐蚀电流密度降低到 0.954 μ A/cm 2 ，极化电阻和低频阻抗值分别提高到 2.47 k Ω ·cm 2 和 13.2 k Ω ·cm 2 。柠檬酸与镧离子形成络合物附着在热镀锌板表面参与成膜，并起到一定的缓蚀作用，使得改进镧盐转化膜覆盖均匀性和致密性提高，其耐腐蚀性能优于常规镧盐转化膜。
- Abstract:
- The conventional lanthanum salt conversion films and improved lanthanum salt conversion films were respectively prepared on the hot galvanized plates for construction through chemical conversion treatment using conventional lanthanum salt treatment solution and improved lanthanum salt treatment solution containing citric acid ， and the adhesion ， morphology ， composition and corrosion resistance of the different lanthanum salt conversion films were tested and compared. The results showed that both conventional lanthanum salt conversion films and improved lanthanum salt conversion films were composed of Zn ， La ， C and O elements ， combined well with hot-galvanized plates and can inhibit the corrosion of hot-galvanized sheets. Compared with the conventional lanthanum salt conversion films ， the cracks on the surface of improved lanthanum salt conversion films were repaired to a certain extent ， and its compactness and surface covering uniformity of the hot galvanized plates were better. The resistance time of lead acetate dropping was prolonged by about 20 s ， the corrosion current density was decreased to 0.954 μ A/cm 2 ， and the polarization resistance and low frequency impedance were increased to 2.47 k Ω ·cm 2 and 13.2 k Ω ·cm 2 ， respectively. The complex was formed by citric acid and lanthanum ions on the surface of hot galvanized plates to participate in the film formation ， which played a certain corrosion inhibition effect. The uniformity and compactness of the improved lanthanum salt conversion films were improved ， so its corrosion resistance was better than that of conventional lanthanum salt conversion films.
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相似文献/References:
[1]陈天丽. 处理时间对建筑用热镀锌板镧盐转化膜耐蚀性的影响 [J].电镀与精饰,2022,(7):24.[doi:10.3969/j.issn.1001-3849.2022.07.005]
CHEN Tianli.Effect of Treatment Time on Corrosion Resistance of Lanthanum Salt Conversion Films on Hot Galvanized Plate Used in Construction[J].Plating & Finishing,2022,(2):24.[doi:10.3969/j.issn.1001-3849.2022.07.005]
备注/Memo
收稿日期： 2021-06-25 修回日期： 2021-08-19 作者简介： 韩晶晶（ 1987 —），女，本科，讲师，主要研究方向：建筑工程材料、腐蚀与防护等。 email ： hanjing05090@163.com 通信作者： 窦国涛（ 1985 —），男，博士，讲师， email ： wuzuoxun98552@126.com 基金项目： 河南省教育厅项目（ 202102310547 ）?/html>