Effect of Pulse Current on Micro-arc Oxidation Process for 1050 Al-alloy

doi:10.11902/1005.4537.2017.109

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (3): 283-288 DOI: 10.11902/1005.4537.2017.109

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Effect of Pulse Current on Micro-arc Oxidation Process for 1050 Al-alloy

Zhao YANG, Huiying SHI(

), Bailing JIANG, Yanfeng GE, Jing ZHANG, Manyu ZHANG, Yan LI

Department of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

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Abstract

The effect of pulse current on micro-arc oxidation (MAO) process for 1050 Al-alloy was investigated. The thickness and roughness, surface morphology and corrosion performance of the prepared MAO coatings were assessed by means of eddy current thickness gauge and roughness tester, scanning electron microscope (SEM) and potentiodynamic polarization measurement respectively. The energy consumption of MAO process was calculated based on voltage versus time curves. Results indicate that with the increasing pulse current from 100 to 800 A, the arcing time shorten from 360 s to 15 s, while the arcing voltage rose from 341 V to 887 V. The diameter of micropores of the coatings was enlarged but the quantity reduced. While thicker and coarser ceramic coatings were obtained on the Al-alloy but with degraded corrosion resistance. The energy consumption of arcing process decreased at first then raised, and which presented the minimum value of 18.3 kJ for a pulse current of 200 A. The energy consumption of MAO coating process presented approximately a linear growth with the increasing pulse current density.

Key words: Al-alloy micro-arc oxidation pulse current corrosion resistance energy consumption

Received: 05 July 2017

ZTFLH:	TG174.4
	TG179

Fund: Supported by Natural Science Foundation of Shaanxi Province (2018JQ5179)

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	Zhao YANG
	Huiying SHI
	Bailing JIANG
	Yanfeng GE
	Jing ZHANG
	Manyu ZHANG
	Yan LI

Cite this article:

Zhao YANG, Huiying SHI, Bailing JIANG, Yanfeng GE, Jing ZHANG, Manyu ZHANG, Yan LI. Effect of Pulse Current on Micro-arc Oxidation Process for 1050 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 283-288.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.109 OR https://www.jcscp.org/EN/Y2018/V38/I3/283

Fig.1 Schematic diagram of electrical control parameters of power source

Fig.2 Effects of pulse current on arcing time and voltage during MAO of 1050 aluminum alloy

Fig.3 Voltage-time curves in MAO process at different pulse currents

Table 1 Thickness and roughness of ceramic coatings formed on 1050 aluminum alloy during MAO at different pulse currents

Fig.4 Surface morphologies of 1050 aluminum alloy after MAO at different pulse currents: (a) 100 A, (b) 200 A, (c) 300 A, (d) 400 A, (e) 600 A, (f) 800 A

Fig.5 Cross-sectional morphologies of 1050 aluminum alloy after MAO at different pulse currents: (a) 200 A, (b) 400 A, (c) 800 A

Fig.6 Potentiodynamic polarization curves of bare and MAO treated 1050 aluminum alloy in 3.5%NaClsolution

Table 2 Fitting electrochemical parameters of potentiodynamic polarization curves for bare and MAO treated 1050 aluminum alloy in 3.5%NaCl solution

Fig.7 Energy consumptions of arcing and ceramic coating growing during MAO of 1050 aluminum alloy at different pulse currents

Fig.8 Energy consumption for the formation of unit-thickness MAO coating on 1050 aluminum alloy at different pulse currents

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