Cerium-Based Sealing Treatment of Mg-Al Hydrotalcite Film on AZ91D Magnesium Alloy

doi:10.1007/s40195-016-0448-4

Abstract

Abstract:

An environment-friendly cerium-based sealing treatment was developed to improve the surface integrity and corrosion resistance of Mg-Al hydrotalcite film on AZ91D magnesium alloy. The cerium dioxide was generated through three stages namely nucleation, growth and dissolution, modifying the surface of AZ91D Mg alloy, and the hydrotalcite film became integral after being treated for 30 min. The results of polarization curves showed that the anti-corrosive performance of the hydrotalcite film was enhanced by the sealing treatment. Moreover, the immersion tests and electrochemical impedance spectrum measurements also demonstrated that the sealed hydrotalcite film provided a longer-term protection of magnesium alloy from corrosion as compared to the unsealed one.

Key words: AZ91D magnesium alloy, Mg-Al hydrotalcite film, Sealing treatment, Ce-containing solution, Corrosion resistance

Qiang-Sheng Dong,Zhi-Xin Ba,Zhang-Zhong Wang,Juan Kuang,Zheng-Yang Cai,Chen Yuan. Cerium-Based Sealing Treatment of Mg-Al Hydrotalcite Film on AZ91D Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(11): 993-1000.

Figures/Tables 10

Fig. 1 OCP of HT films during cerium-based treatment as well as relevant morphologies: a nucleation, b growth, c cracking

Fig. 2 XRD pattern of the film on Mg alloy treated for 30 min

Fig. 3 Polarization curves of samples in 0.1 mol/L NaCl solution

Fig. 4 Hydrogen evolution curves immersed in 0.1 mol/L NaCl solution

Fig. 5 Macro- and micro-corrosion morphologies of the samples immersed in 0.1 mol/L NaCl solution: macro-corrosion morphologies: a original HT-120 h, b sealed HT-120 h, c sealed HT-168 h; micro-corrosion morphologies: d original HT-120 h, e sealed HT-120 h, f sealed HT-168 h

Fig. 6 EIS spectra of the AZ91D alloys immersed in 0.1 mol/L NaCl solution. a Nyquist plots, b, c bode plots

Fig. 7 Equivalent circuits for the EIS spectra of AZ91D alloys immersed in 0.1 mol/L NaCl solution: a sealed HT film for 0-120 h, b sealed HT film immersed for more than 168 h and original HT film

Fig. 8 Schematic diagram of possible treatment process in Ce-containing solution

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