Investigation of Anodic Film on a Novel RE-containing Al-Alloy Al-Zn-Mg-Cu-Sc

doi:10.11902/1005.4537.2020.005

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (2): 131-138 DOI: 10.11902/1005.4537.2020.005

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Investigation of Anodic Film on a Novel RE-containing Al-Alloy Al-Zn-Mg-Cu-Sc

WANG Yingjun¹, LIU Honglei¹, WANG Guojun¹, DONG Kaihui², SONG Yingwei²(

), NI Dingrui²

1 Northeast Light Alloy CO. , LTD, Harbin 150060, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

A novel anodic process was developed for a RE-containing 7000 series Al-alloy Al-Zn-Mg-Cu-Sc. Further, sealing-pore post treatments were carried out to improve the compactness of the anodic film. The results indicate that the precipitated Sc-containing phases on the surface of 7000 series Al-alloy act as micocathodes to accelerate the corrosion of Al matrix, which has a negative effect on the uniformity of the anodic film. In order to solve this trouble, the formula and electric parameters of the electrolyte bath were adjusted, hence, a uniform and smooth anodic film is formed on the surface of the Al-alloy. Meantime, three sealing-pore processes with fluozirconate, cerate and boiling water respectively were carried out to improve the compactness of the anodic film. It is found that after boiling water sealing-pore, the anodic film exhibits a sliver like uniform surface without defects and microcracks, among others, that film presents the best corrosion resistance, and the film can keep intact after salt spray test for 336 h, which can satisfy the requirement for the actual applications.

Key words: RE aluminum alloy precipitation phase anodic film sealing-pore treatment corrosion resistance

Received: 09 January 2020

ZTFLH:

TG174

Fund: National Key R&D Program of China(2016YFB0301105)

Corresponding Authors: SONG Yingwei E-mail: ywsong@imr.ac.cn

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	Yingjun WANG
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Cite this article:

WANG Yingjun, LIU Honglei, WANG Guojun, DONG Kaihui, SONG Yingwei, NI Dingrui. Investigation of Anodic Film on a Novel RE-containing Al-Alloy Al-Zn-Mg-Cu-Sc. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 131-138.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.005 OR https://www.jcscp.org/EN/Y2020/V40/I2/131

Fig.1 SEM surface morphologies of non-etched (a) and etched (b) Sc-containing 7000 series Al alloy

Fig.2 Surface morphology of 7000 series Al alloy substrate after alkaline etching

Fig.3 Effects of process parameters on the impedance value of the anodic film: (a) concentration of H₂SO₄, (b) concentration of additive, (c) voltage, (d) time, (e) temperature

Fig.4 EIS plots of Al substrate and anodic film in 3.5% NaCl solution

Fig.5 Optical photos of Al alloy substrate before (a) and after (b) immersion in 3.5%NaCl solution for 20 h, and formed anodic film (c)

Fig.6 EIS plots of sealing treated anodic film in 3.5%NaCl solution

Fig. 7 Equalvent circuit of EIS plots of anodic film with different sealing treatments

Table 1 Fitting results of EIS plots

Fig.8 Surface (a) and cross-section (b) morphologies of the anodic film with sealing treatment in boiling water

Fig.9 Polarization curves of Al substrate, untreated and boiling water sealed anodic films in 3.5%NaCl solution

Table 2 Fitting results of polarization curves

Fig.10 Optical photos of anodic film untreated (a) and treated by sealing (b) and sealing+336 h salt spray test (c)

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