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

doi:10.11900/0412.1961.2018.00020

Acta Metall Sin

2018, Vol. 54

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

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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

Cite this article:

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. Acta Metall Sin, 2018, 54(10): 1417-1427.

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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

Received: 12 January 2018

ZTFLH:

TG178

Fund: Supported by Guangxi Natural Science Foundation (No.2017GXNSFBA198202) and Guangxi Science and Technology Major Project (No.AA17204100)

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	Yusheng ZHANG
	Youbin WANG
	Chunmin LI
	Bingtao ZHOU
	Keke CHENG
	Yuezhou WEI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00020 OR https://www.ams.org.cn/EN/Y2018/V54/I10/1417

Fig.1 XRD spectra of 6061 Al substrate and different ZnAl-LDHs films

Fig.2 FT-IR spectra of different ZnAl-LDHs films on the 6061 Al alloy surface

Fig.3 SEM images (a₁~c₁) and related EDS maps (a₂~c₂, a₃~c₃) of ZnAl-LDHs-NO₃ (a₁~a₃), ZnAl-LDHs-VO₄ (b₁~b₃) and ZnAl-LDHs-VO₃ (c₁~c₃) films on the 6061 Al alloy surface

Fig.4 Polarization curves of the 6061 Al substrate and different ZnAl-LDHs films immersed in 3.5%NaCl solution

Table 1 Electrochemical parameters of the 6061 Al substrate and different ZnAl-LDHs films

Fig.5 Corrosion morphologies of 6061 Al substrate (a), ZnAl-LDHs-NO₃ (b), ZnAl-LDHs-VO₄ (c) and ZnAl-LDHs-VO₃ (d) films

Fig.6 3D corrosion morphologies of 6061 Al substrate (a), ZnAl-LDHs-NO₃ (b), ZnAl-LDHs-VO₄ (c) and ZnAl-LDHs-VO₃ (d) films corresponding to areas A~D in Fig.5, respectively

Table 2 EDS elemental compositions of the ZnAl-LDHs films after the polarization test at the positions indicated in Fig.7 (atomic fraction / %)

Fig.7 SEM images of 6061 Al substrate (a), ZnAl-LDHs-NO₃ (b), ZnAl-LDHs-VO₄ (c) and ZnAl-LDHs-VO₃ (d) films after the polarization test

Fig.8 Bode plots (a, b) and Nyquist plot (c) of 6061 Al substrate and different ZnAl-LDHs films and equivalent circuit (d) for modeling impedance data (CPE_LDHs—LDHs films capacitance; R_LDHs—LDHs film resistance; CPE_dl—double layer capacitance; R_ct—charge transfer resistance, R_sol—solution resistance of electrolyte)

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

Table 3 Fitting parameters of the equivalent circuit of 6061 Al substrate and different ZnAl-LDHs films in 3.5%NaCl solution

Fig.9 Preparation process diagram of the ZnAl-LDHs film on 6061 Al alloy surface

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