Effect of Electrical Parameters on Energy Consumption and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg-alloy

doi:10.11902/1005.4537.2023.284

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (4): 1064-1072 DOI: 10.11902/1005.4537.2023.284

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Effect of Electrical Parameters on Energy Consumption and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg-alloy

TIAN Mengzhen¹, WANG Yong², LI Tao³, WANG Chuan², GUO Quanzhong²(

), GUO Jianxi⁴(

)

1. College of Chemistry, Liaoning University, Shenyang 110036, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Shandong Key Laboratory of Advanced Aluminium Materials and Technology, Binzhou Institute of Technology, Binzhou 256600, China
4. Naval Service Academy, Tianjin 300450, China

Cite this article:

TIAN Mengzhen, WANG Yong, LI Tao, WANG Chuan, GUO Quanzhong, GUO Jianxi. Effect of Electrical Parameters on Energy Consumption and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg-alloy. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1064-1072.

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Abstract

Micro-arc oxidation (MAO) can improve the corrosion resistance of Mg-alloys, but it has the deficiency of high energy consumption, which restricts its large-scale application on Mg-alloy components. In order to reduce the energy consumption of micro-arc oxidation, micro-arc oxidation coatings were prepared on the surface of AZ31B Mg-alloy in an electrolyte of Na₂SiO₃ 20 g/L, NaOH 2 g/L and NaF 2 g/L by pulsed power supply, and the effects of electrical parameters (frequency, duty cycle and current density) on the unit energy consumption and corrosion resistance of the coatings were studied by means of scanning electron microscopy, electrochemical testing and salt spray test. The results show that the frequency has less effect on the unit energy consumption of the coatings, but the higher the frequency, the better the corrosion resistance of the coatings; the duty cycle has more obvious effect on the energy consumption, with the increase of the duty cycle, the unit energy consumption of the coatings decreases, but the corrosion resistance decreases; the current density also has a significant influence on the energy consumption, the higher the current density, the higher the unit energy consumption of the coatings, but the change of current density has less effect on the corrosion resistance of the coatings.

Key words: Micro-arc oxidation Mg-alloy energy consumption corrosion resistance

Received: 11 September 2023 32134.14.1005.4537.2023.284

ZTFLH:

TG174.4

Fund: Bintech-IMR R&D Program(GYY-JSBU-2022-006)

Corresponding Authors: GUO Quanzhong, E-mail: qzguo@imr.ac.cn;

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	TIAN Mengzhen
	WANG Yong
	LI Tao
	WANG Chuan
	GUO Quanzhong
	GUO Jianxi

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.284 OR https://www.jcscp.org/EN/Y2024/V44/I4/1064

Fig.1 U-t and I-t curves of MAO at different frequencies: (a) direct current, (b) 100 Hz, (c) 500 Hz, (d) 1000 Hz

Table 1 Energy consumption of MAO coatings formed at different frequencies

Fig.2 Morphologies of MAO coatings formed at a frequency of 100 Hz (a), 500 Hz (b) and 1000 Hz (c)

Fig.3 Polarization curves of MAO coatings formed at different frequencies

Table 2 Fitting data of the polarization curves from Fig.3

Fig.4 Macro morphologies of MAO coatings formed at a frequency of 100 Hz (a), 500 Hz (b) and 1000 Hz (c) after 96 h neutral salt spray test

Table 3 Results of neutral salt spray test of MAO coatings formed at different frequencies

Table 4 Energy consumption of MAO coatings formed at different duty cycle

Fig.5 Morphologies of MAO coatings formed at a duty cycle of 20% (a), 50% (b) and 80% (c)

Fig.6 Polarization curves of MAO coatings formed at different duty cycle

Table 5 Fitting data of the polarization curves from Fig.6

Fig.7 Macro morphologies of MAO coatings formed at a duty cycle of 20% (a), 50% (b) and 80% (c) after 96 h neutral salt spray test

Table 6 Results of neutral salt spray test of MAO coatings formed at different duty cycle

Table 7 Energy consumption of MAO coatings formed at different current densities

Fig.8 Morphologies of MAO coatings formed at a current density of 0.5 A·dm^-2 (a), 1 A·dm^-2 (b), 2 A·dm^-2 (c) and 3 A·dm^-2 (d)

Fig.9 Distribution of pore size and quantity on the surface of MAO coatings formed at different current densities

Fig.10 Polarization curves of MAO coatings formed at different current densities

Table 8 Fitting data of the polarization curves from Fig.10

Table 9 Results of neutral salt spray test of MAO coatings formed at different current densities

Fig.11 Macro morphologies of MAO coatings formed at a current density of 0.5 A·dm^-2 (a), 1 A·dm^-2 (b), 2 A·dm^-2 (c) and 3 A·dm^-2 (d) after 96 h neutral salt spray test

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