Abstract
ZE41A magnesium alloy was selected as matrix material, using hydrothermal method for the synthesis of the surface coating. The formation of anti-corrosion coatings on the surface of magnesium alloy was investigated in pure water. By adjusting the experimental parameters such as the hydrothermal time (1-3 h) and the hydrothermal temperature (120-160 °C), the generation of the coating on the magnesium alloy surface is regulated. The surface morphologies, composition phase, and corrosion resistance of the hydrothermal conversion coatings were investigated by the method of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and electrochemical corrosion tests. Results show that prolonged hydrothermal time and increased hydrothermal temperature change the morphologies as well as the chemical compositions of formed coatings from a relative loose structure with few magnesium hydroxides into a fine dense one with higher amount of magnesium hydroxide.
Highlights
Mg alloys are of industrial interest as structural metals due to their low density and high strength to weight ratio[1,2]
The films are characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) and the corrosion behavior is evaluated by electrochemical tests including open-circuit potential, electrochemical impedance spectrum and potentiodynamic polarization
The ZE41A magnesium alloy specimens with the size of 10 mm × 10 mm × 5 mm were cut from a cast ingot
Summary
Mg alloys are of industrial interest as structural metals due to their low density and high strength to weight ratio[1,2]. Their poor corrosion resistance limits their applications[3,4]. To improve the corrosion resistance of magnesium alloys, some techniques including alloying [5], laser surface modification[6] and electrochemical deposition method[7] have been studied. The corrosion properties of magnesium alloys can be enhanced by the formation of oxide and/or hydroxide films via HT treatment [9]. ZE41A magnesium alloy samples are treated by the HT method at different temperatures and for various time durations to form corrosion resistant films. The films are characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) and the corrosion behavior is evaluated by electrochemical tests including open-circuit potential, electrochemical impedance spectrum and potentiodynamic polarization
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