Abstract
This work examined the influence of dual incorporation of MoO2 and SiO2 on the corrosion behavior of pure titanium treated via plasma electrolytic oxidation (PEO). To achieve this purpose, pure titanium substrate was treated via PEO in an alkaline-molybdate electrolyte without and with SiO2 nanoparticles. The microstructural observation revealed that the addition of SiO2 nanoparticles into the electrolyte during PEO helped to seal the structural defects in the PEO coating so that a rougher, thicker, and denser coating rich in SiO2 was successfully obtained. From the electrochemical measurements in a 3.5 wt.% NaCl solution, the TiO2-MoO2-SiO2 hybrid coating exhibited a higher corrosion resistance than the TiO2-MoO2 coating which was attributed to the sealing effect by stable SiO2 nanoparticles.
Highlights
Metals 2021, 11, 1182. https://Owing to the compelling physical and chemical characteristics, such as high melting point, high corrosion resistance, and biocompatibility, Ti and its alloys have useful applications in aerospace, petrochemical, and biomedical industries [1,2,3]
Various active metals have been used in the past, titanium metal exhibits strong resistance to corrosion in both acidic and alkaline environments [4]
The coatings obtained in both baths exhibited a conventional microFigure 1 displays the surface images of the samples treated via the plasma electrolytic oxidation (PEO) in Baths A
Summary
Metals 2021, 11, 1182. https://Owing to the compelling physical and chemical characteristics, such as high melting point, high corrosion resistance, and biocompatibility, Ti and its alloys have useful applications in aerospace, petrochemical, and biomedical industries [1,2,3]. Various active metals have been used in the past, titanium metal exhibits strong resistance to corrosion in both acidic and alkaline environments [4]. The electrochemical corrosion behavior of Ti metal is mainly due to the formation of a stable, protective, and strongly adherent oxide layer. Titanium can restore this film almost instantly in any environment that includes a trace of moisture or oxygen because of its strong affinity for oxygen [4]. Further improvements in the electrochemical stability of Ti and its alloys in corrosive environments would be needed to extend their industrial applications [6,7,8,9]
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