6061铝合金表面ZnAl-LDHs层的制备及其耐腐蚀性能

doi:10.11900/0412.1961.2018.00020

金属学报

2018, Vol. 54

Issue (10): 1417-1427 DOI: 10.11900/0412.1961.2018.00020

本期目录 | 过刊浏览

6061铝合金表面ZnAl-LDHs层的制备及其耐腐蚀性能

张玉圣^1,², 王友彬^1,²(

), 李纯民^1,², 周秉涛^1,², 程珂珂^1,², 韦悦周^1,²

1 广西大学广西有色金属及特色材料加工重点实验室南宁 530004
2 广西大学资源环境与材料学院南宁 530004

Preparation and Corrosion Resistance of the ZnAl-LDHs Film on 6061 Al Alloy Surface

Yusheng ZHANG^1,², Youbin WANG^1,²(

), Chunmin LI^1,², Bingtao ZHOU^1,², Keke CHENG^1,², Yuezhou WEI^1,²

1 Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China
2 School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China

引用本文:

张玉圣, 王友彬, 李纯民, 周秉涛, 程珂珂, 韦悦周. 6061铝合金表面ZnAl-LDHs层的制备及其耐腐蚀性能[J]. 金属学报, 2018, 54(10): 1417-1427.
Yusheng ZHANG, Youbin WANG, Chunmin LI, Bingtao ZHOU, Keke CHENG, Yuezhou WEI. Preparation and Corrosion Resistance of the ZnAl-LDHs Film on 6061 Al Alloy Surface[J]. Acta Metall Sin, 2018, 54(10): 1417-1427.

全文: PDF(10413 KB) HTML

摘要:

采用原位生长的方法,首先在6061铝合金表面制备了层间含NO₃^-的ZnAl-LDHs (layered double hydroxides,层状双金属氢氧化物)层,然后将正钒酸根(VO₄^3-)和偏钒酸根(VO₃^-) 2种缓蚀剂离子插入ZnAl-LDHs-NO₃层板间,在6061铝合金表面制备了ZnAl-LDHs-VO₄和ZnAl-LDHs-VO₃层。通过XRD、FT-IR和SEM等技术研究了上述3种ZnAl-LDHs层的晶体结构、成分组成和表面形貌,并分析了ZnAl-LDHs层的生长行为;通过电化学工作站和超景深3D视频显微镜研究了6061铝合金表面3种ZnAl-LDHs层在3.5%NaCl水溶液中的耐腐蚀行为。结果表明,6061铝合金表面原位制备的ZnAl-LDHs层呈片状垂直于基体生长,能够完全覆盖在铝合金表面。与6061铝合金基体相比,含ZnAl-LDHs层的铝合金具有较高的腐蚀电位(E_corr)、较小的腐蚀电流(I_corr)和较大的电荷转移电阻(R_ct)。这说明ZnAl-LDHs层能够明显提高6061铝合金的耐腐蚀性能,可用于6061铝合金表面的防腐蚀保护。在6061铝合金表面的3种ZnAl-LDHs层中,ZnAl-LDHs-VO₃的耐腐蚀性能最高。

关键词 ：铝合金, ZnAl-LDHs层, 腐蚀

Abstract：

6061 Al alloy is widely used for structural components in the structural, building, aerospace and automobile industry because of their good extrude-ability, high strength and low density. 6061 Al alloy is easily corroded during the corrosive environments containing Cl^-, which lead to the decreasing of the alloy service life. Therefore, the Al alloy need to adopt surface treatment to improve the corrosion resistance. The chromate passivation was the most effective surface treatment technology of Al alloys in the past. However, Cr(VI) could pollute the environment and harmful to human body. Thus, it is necessary to develop chromium-free films to protect Al alloy. Layered double hydroxides (LDHs) are an environment-friendly and smart material, which could be used for anticorrosion film. The inhibitor can be inserted into the film layer due to its unique anion exchanging capacity. Therefore, the LDHs is acquired self-healing performance and applied to the anticorrosion field of Al alloy. Meanwhile, vanadate is a good inhibitor and it has many forms under different pH conditions. Moreover, different forms of vanadate have different influence on LDHs film. The corrosion resistance of LDHs and its modified form films on Al alloys need deep study. In this work, ZnAl-LDHs films with NO₃^- were prepared on the suface of 6061 Al alloy via a facile in-situ growth method, and then ZnAl-LDHs-NO₃ films were intercalated with the corrosion inhibitor VO₄^3- and VO₃^- to obtain the ZnAl-LDHs-VO₄and ZnAl-LDHs-VO₃ films, respectively. The structure, morphology and composition of as-prepared ZnAl-LDHs films were investigated by XRD, fourier infrared spectrometer (FT-IR) and SEM; the corrosion behavior of ZnAl-LDHs films in the 3.5%NaCl (mass fraction) solution were studied by the electrochemical workstation and the 3D microscope. The results show that the plate-like ZnAl-LDHs microcrystals are perpendicular to the substrate and cover almost the entire Al alloy substrate surface. Compared with the 6061 Al substrate, ZnAl-LDHs films can not only decrease the corrosion current (I_corr), but also increase the corrosion potential (E_corr) and charge transfer resistance (R_ct) of the 6061 Al alloy. It is suggested that ZnAl-LDHs films could significantly enhance the corrosion resistance of 6061 Al substrate, indicating an effective protection for 6061 Al alloy by the ZnAl-LDHs film. The ZnAl-LDH-VO₃film is of the highest corrosion resistance in the studied ZnAl-LDHs films.

Key words： Al alloy ZnAl-LDHs film corrosion

收稿日期: 2018-01-12

ZTFLH:

TG178

基金资助:广西自然科学基金项目No.2017GXNSFBA198202和广西创新驱动发展专项(科技重大专项)项目No.AA17204100

作者简介:

作者简介张玉圣,男,1992年生,硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00020 或 https://www.ams.org.cn/CN/Y2018/V54/I10/1417

图1 6061铝合金基体及表面不同ZnAl-LDHs层的XRD谱

图2 6061铝合金表面不同ZnAl-LDHs层的FT-IR谱

图3 6061铝合金表面不同ZnAl-LDHs层的SEM像及其相应的EDS面扫描图

图4 6061铝合金基体及不同ZnAl-LDHs层在3.5%NaCl溶液中的极化曲线

表1 6061铝合金基体及不同ZnAl-LDHs层的电化学参数

图5 6061铝合金基体及表面不同ZnAl-LDHs层的极化腐蚀形貌

图6 6061铝合金基体及表面不同ZnAl-LDHs层极化腐蚀后的三维形貌

表2 图7中各微区极化腐蚀后的EDS分析

图7 6061铝合金基体及表面不同ZnAl-LDHs层极化腐蚀后的SEM像

图8 6061铝合金基体和表面不同ZnAl-LDHs层的EIS及其等效电路图

Specimen	CPE_LDHs / (Ω^-1cm^-2 $s - n 1$ )		R_LDHs Ωcm²	CPE_dl / (Ω^-1cm^-2 $s - n 2$ )		R_ct Ωcm²
	Y₁	n₁	R_LDHs Ωcm²	Y₂	n₂	R_ct Ωcm²
6061 Al substrate	1.34×10^-5	0.25	9.01×10⁰	5.37×10^-6	0.85	9.86×10³
ZnAl-LDH-NO₃	4.25×10^-6	0.97	3.41×10²	4.25×10^-6	0.87	9.28×10⁴
ZnAl-LDH-VO₄	3.59×10^-6	0.77	1.27×10³	4.33×10^-6	0.91	1.37×10⁶
ZnAl-LDH-VO₃	4.39×10^-6	0.76	1.25×10³	4.04×10^-6	0.91	5.67×10⁶

表3 6061铝合金基体和表面不同ZnAl-LDHs层在3.5%NaCl溶液中的EIS等效电路拟合结果

图9 6061铝合金表面ZnAl-LDHs层的制备过程图

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