Effect of Ferric Citrate on Microstructure and Corrosion Resistance of Micro-arc Oxidation Black Film on Mg-alloy AZ40M

doi:10.11902/1005.4537.2016.097

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (4): 360-365 DOI: 10.11902/1005.4537.2016.097

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Effect of Ferric Citrate on Microstructure and Corrosion Resistance of Micro-arc Oxidation Black Film on Mg-alloy AZ40M

Li FENG¹(

), Ligong ZHANG¹, Sizhen LI¹, Dajiang ZHENG²(

), Changjian LIN³, Shigang DONG⁴

1 Beijing Spacecrafts China Academy of Space Technology, Beijing 100190, China
2 College of Materials, Xiamen University, Xiamen 361005, China
3 College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
4 College of Energy, and School of Energy Research, Xiamen University, Xiamen 361005, China

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Abstract

Black oxide films on Mg-alloy AZ40M were prepared by means of a two-step micro-arc oxidation process in electrolytes of 15 g/L Na₃PO₄+ 3 g/L NaF+5.6 g/L KOH and 20 g/L Na₃PO₄+5 g/L NaF with different additions of ferric citrate respectively. The microstructure and composition of the films were characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-Ray diffractometer (XRD). The electrochemical corrosion property of the films was assessed by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves in 0.1 mol/L NaCl solution. Results showed that the concentration of ferric citrate strongly affects the surface morphology, composition and thickness of the formed oxide films. The oxide films have good corrosion resistance. The thicker oxide film with less iron content presents better corrosion resistance.

Key words: magnesium alloy micro-arc oxidation black oxide film layer corrosion electrochemicalimpedance spectroscopy

Received: 13 July 2016

ZTFLH:

TG146

Fund: Supported by National Natural Science Foundation of China (21321062)

About author:

These authors contributed equally to this work.

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	Li FENG
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	Shigang DONG

Cite this article:

Li FENG, Ligong ZHANG, Sizhen LI, Dajiang ZHENG, Changjian LIN, Shigang DONG. Effect of Ferric Citrate on Microstructure and Corrosion Resistance of Micro-arc Oxidation Black Film on Mg-alloy AZ40M. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 360-365.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.097 OR https://www.jcscp.org/EN/Y2017/V37/I4/360

Fig.1 Digital images of MAO layers formed on AZ40M alloy in the electrolytes with different concentrations of ferric citrate

Fig.2 Average thicknesses of MAO layers prepared in the electrolytes with different concentrations of ferric citrate

Fig.3 Surface SEM images of AZ40M magnesium alloy (a) and the magrified image of area I in Fig.3a (b)

Fig.4 XRD spectra of AZ40M Mg alloy before and after MAO in the electrolytes with different concentrations of ferric citrate

Fig.5 Surface morphologies of MAO films prepared in the electrolytes with 5 g/L (a), 10 g/L (b), 15 g/L (c) and 20 g/L (d) ferric citrate

Table 1 Elements contents of MAO films prepared in the electrolytes with different concentrations of ferric citrate (atomic fraction / %)

Fig.6 Bode (a) and Nyquist (b) plots of MAO treated AZ40M Mg alloy after immersed in 0.1 mol/L NaCl for 20 min(the inset is the enlarged view of high frequency region)

Fig.7 Potentiodynamic polarization curves of MAO treated AZ40M Mg-alloy after immersed in 0.1 mol/L NaCl for 30 min

Table 2 Tafel fitted parameters of potentiodynamic polarization curves in Fig.7

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