FORMATION AND CORROSION RESISTANCE OF Mg–Al HYDROTALCITE FILM ON Mg–Gd–Zn ALLOY

Z. X. Ba, Q. S. Dong, S. X. Kong, X. B. Zhang, Y. J. Xue and Y. J. Chen
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Z. X. Ba: School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, P. R. China†Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, P. R. China
Q. S. Dong: School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, P. R. China
S. X. Kong: School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, P. R. China
X. B. Zhang: School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, P. R. China†Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, P. R. China
Y. J. Xue: School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, P. R. China†Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, P. R. China
Y. J. Chen: School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 01, 1-8

Abstract: An environment-friendly technique for depositing a Mg–Al hydrotalcite (HT) (Mg6Al2(OH)16-CO3⋅4H2O) conversion film was developed to protect the Mg–Gd–Zn alloy from corrosion. The morphology and chemical compositions of the film were analyzed by scanning electronic microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy (RS), respectively. The electrochemical test and hydrogen evolution test were employed to evaluate the biocorrosion behavior of Mg–Gd–Zn alloy coated with the Mg–Al HT film in the simulated body fluid (SBF). It was found that the formation of Mg–Al HT film was a transition from amorphous precursor to a crystalline HT structure. The HT film can effectively improve the corrosion resistance of magnesium alloy. It indicates that the process provides a promising approach to modify Mg–Gd–Zn alloy.

Keywords: Magnesium alloy; film; hydrotalcite; biocorrosion (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500032

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