Abstract

Hybrid coatings composed of the inorganic film; Micro-Arc Oxidized (MAO) and organic film; Dopamine (DOP) or Phytic Acid (PA) was successfully deposited on AZ31. The DOP@MAO@AZ31 film reduced the corrosion current 3-times the MAO film while, the PA@MAO@AZ31presented a slight improvement. Here, the film morphology is the master key for the corrosion resistance enhancement in Simulated Body Fluid (SBF). The Dopamine film supported the MAO inner layer and blocked the porous structure. The Phytic acid transformed the porous MAO layer into a cracked structure to facilitate corrosive ions attack. All experimental outcomes were verified by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction (XRD). The in-vitro corrosion performance was estimated utilizing electrochemical measurements.

Keywords: Micro-arc oxidation; Corrosion resistance; Hybrid coating; Mg

Graphical abstract

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