Electrochemical response of ZrO2-incorporated oxide layer on AZ91 Mg alloy processed by plasma electrolytic oxidation

How deposition parameters affect corrosion behavior of TiO2-Al2O3 nanocomposite coatings

“…Furthermore, as it was shown earlier, the alumina nanoparticles are preferred sites for the nucleation and solidification of the fused layer made by electric sparks [48,49,57]. They also cover the interior walls of micropores, reducing the pore size [34]. Consequently, it can be inferred that the increase in the concentration of alumina nanoparticles reduces the intensity of electric sparks during the EEMAO process.…”

“…An electric equivalent circuit which is shown in Fig. 11(d) was employed to simulate EIS data for coated samples [5][6][7]32,34,59]. In the equivalent electric circuit mentioned above, the solution resistance between the working electrode and the reference electrode, the capacitive resistance, and the resistive behavior of the internal compact layer, are respectively represented by R s , CPE I (constant phase element), and R I .…”

“…These coatings are fabricated by different techniques such as oxidation of the metal surfaces [3,[20][21][22], sol-gel process [19], vapor phase deposition [23,24], electrophoresis [25], and thermal spray [26,27]. To improve wear, corrosion and photocatalytic properties of valve metals including Al [7,28,29], Ti [4,[30][31][32][33], Mg [1,[34][35][36][37], and Zr [38][39][40], surface oxidation techniques, such as Micro Arc Oxidation have been successfully used. Micro Arc Oxidation (MAO) process [41][42][43] is a relatively new method to oxidize metallic surfaces which has attracted many research works in recent years.…”

“…PZC is defined as a pH at which the particle has zero charge [49]. Fabrication of composite coatings containing nano/microparticles of TiO 2 [36], ZrO 2 [12,29,48], Si 3 N 4 [50], CNT [34], and Cr 2 O 3 [47] was previously reported where the wear and corrosion resistance of a metallic substrate have been improved significantly [34]. TiO 2 -ZrO 2 -Hap composite coatings were fabricated in order to enhance the biocompatibility of titanium implants by EEMAO process [10][11][12].…”

Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy

“…Introducing particles to the PEO electrolyte, such as clay, ZrO 2 , CeO 2 , Si 3 N 4 , Al 2 O 3 , SiO 2 , SiC and hydroxyapatite (HA), have been explored as new strategies to seal pores and provide a wider range of compositions for PEO coatings on Mg/Mg alloys [12][13][14][15][16][17][18][19][20]. Metal oxide particles (e.g.…”