Abstract
This study describes the use of tetraethylorthosilicate (TEOS) as the precursor to deposit carbon-free silica (SiO2) dense film as the anti-corrosion layer on the surface of AZ91D magnesium alloys using an air atmospheric pressure plasma jet (APPJ). From the contact angle measurements, APPJ-deposited silica film on AZ91D represents a more hydrophobic property with a lower total surface free energy of 31.3 mN/m. XPS depth profile analyses revealed the chemical compositions (O and Si) were uniformly distributed through the bulk of the deposited films with a thickness of 207 nm, which also comprises of carbon-free SiO2 ultrathin films. The electrochemical impedance spectroscopy (EIS) measurements and corrosion morphologies of 14-day immersion test of deposited films and AZ91D samples in 3.5 wt % NaCl solution are also investigated. The results indicate ultrathin silica coating not only alter the surface property, but also improve the corrosion resistance of AZ91D magnesium alloys.
Published Version
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