Preparation and Properties of Micro-arc Oxide Film with Single Dense Layer on Surface of 5083 Aluminum Alloy

doi:10.11902/1005.4537.2019.069

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (3): 251-258 DOI: 10.11902/1005.4537.2019.069

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Preparation and Properties of Micro-arc Oxide Film with Single Dense Layer on Surface of 5083 Aluminum Alloy

CAO Jingyi¹^,², FANG Zhigang¹, CHEN Jinhui³, CHEN Zhixiong³, YIN Wenchang¹, YANG Yange¹^,²^,⁴, ZHANG Wei⁴(

)

1 Unit 92228, People's Liberation Army, Beijing 100072, China
2 Postdoctoral Research Station of Naval Research Academy, Beijing 100073, China
3 Fujian LongXi Bearing (Group) Corp. , LTD, Zhangzhou 363000, China
4 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

Marine Al-alloy 5083 owns low density, good weldability and high hardness, but it is easily suffered from pitting corrosion in sea water due to the effect of Cl^-. Micro-arc oxidation (MAO) is an effective way to improve the corrosion resistance of Al-alloy. In the present study the electrolyte formula was optimized via response surface methodology so that to acquire a novel MAO coating on Al-alloy 5083, which composed of merely a dense layer. The prepare MAO coating was then characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness meter and dynamic polarization technology in terms of microstructure, micro-hardness and corrosion resistance. Results showed that in comparison with the coating prepared with the ordinary electrolyte, the thickness of the MAO coating increases from 30 μm to 90 μm, size of the sintered particles on MAO coating grown from 10 μm to 50 μm, and the thickness of the dense layer increased from 20 μm to 70 μm, accompanied by the increase of the percentage of α-Al₂O₃ in the MAO coating as well. The hardness of the polished MAO coating increased from 900 HV to 1500 HV. Polarization curve and salt frog test results also found that with the increasing of micro-arc oxidation time, the corrosion current density of MAO coating was gradually decreased, while its passivation ability was enhanced. Therefore, corrosion resistance of Al-alloy 5083 was increased substantially in the presence of the MAO coating composed merely of a thick dense layer.

Key words: aluminum alloy micro-arc oxidation single dense layer corrosion resistance

Received: 01 June 2019

ZTFLH:

TG174

Corresponding Authors: ZHANG Wei E-mail: weizhang@imr.ac.cn

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	Jingyi CAO
	Zhigang FANG
	Jinhui CHEN
	Zhixiong CHEN
	Wenchang YIN
	Yange YANG
	Wei ZHANG

Cite this article:

CAO Jingyi, FANG Zhigang, CHEN Jinhui, CHEN Zhixiong, YIN Wenchang, YANG Yange, ZHANG Wei. Preparation and Properties of Micro-arc Oxide Film with Single Dense Layer on Surface of 5083 Aluminum Alloy. Journal of Chinese Society for Corrosion and protection, 2020, 40(3): 251-258.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.069 OR https://www.jcscp.org/EN/Y2020/V40/I3/251

Table 1 Experimental variables and levels

Table 2 Experiment design and the corresponding results

Fig.1 Three dimensional analysis of MAO film resistance: (a) variation with Na₂C₂O₄ and Na₂SiO₃ concentration (NaF concentration is 5 g/L); (b) variation with NaF and Na₂SiO₃ concentration (Na₂C₂O₄ concentration is 10 g/L); (c) variation with NaF and Na₂C₂O₄concentration (Na₂SiO₃ concentration is 35 g/L)

Fig.2 Three dimensional analysis of corrosion current: (a) variation with Na₂C₂O₄ and Na₂SiO₃ concentration (NaF concentration is 5 g/L); (b) variation with NaF and Na₂SiO₃ concentration (Na₂C₂O₄ concentration is 10 g/L); (c) variation with NaF and Na₂C₂O₄ concentration (Na₂SiO₃ concentration is 35 g/L)

Fig.3 Three dimensional analysis of MAO film porosity: (a) variation with Na₂C₂O₄ and Na₂SiO₃ concentration (NaF concentration is 5 g/L); (b) variation with NaF and Na₂SiO₃ concentration (Na₂C₂O₄ concentration is 10 g/L); (c) variation with NaF and Na₂C₂O₄ concentration (Na₂SiO₃ concentration is 35 g/L)

Fig.4 Surface (a~c) and cross section (d~f) morphologies of MAO film of 3 h (a, d), 4 h (b, e), 5 h (c, f) oxidation time

Fig.5 XRD results of MAO film with different oxidation time

Table 3 Hardness of MAO film with different thickness (HV)

Fig.6 Polarization curves of MAO film with different thickness

Table 4 Fitting results of polarization curves

Fig.7 Before (a1~a3) and salt spray test 480 h (b1~b3), 1920 h (c1~c3) and 2800 h (d1~d3) of MAO film with 30 μm (a1~d1), 60 μm (a2~d2) and 90 μm (a3~d3) thickness

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