Resumen
A hybrid material of polystyrene (PS)?ZrO2 was developed by the sol?gel technique and deposited by spin-coating on AM60 and AM60?AlN nanocomposite surfaces to enhance corrosion resistance in marine environments. PS–ZrO2" role="presentation" style="position: relative;"> PS?ZrO2 PS?ZrO2
PS?ZrO
2
with an average thickness of ?305 ± 20 nm" role="presentation" style="position: relative;">305 ± 20 nm305 ± 20 nm
305
±
20
nm
was dispersed homogeneously, presenting isolated micro?nano-structure defects with air trapped inside, which led to an increase in roughness (?4 times). The wettability of the coated substrates was close to the hydrophobic border (θCA=90°–94°)." role="presentation" style="position: relative;">?CA=90°?94°).?CA=90°?94°).
?
CA
=
90
°
?
94
°
)
.
The coated samples were exposed for 30 days to SME solution, simulating the marine?coastal ambience. The initial pH = 7.94 of the SME shifted to more alkaline pH ? 8.54, suggesting the corrosion of the Mg matrix through the coating defects. In the meantime, the release of Mg2+" role="presentation" style="position: relative;">Mg2+Mg2+
Mg
2
+
from the PS–ZrO2" role="presentation" style="position: relative;">PS?ZrO2PS?ZrO2
PS?ZrO
2
-coated alloy surfaces was reduced by ?90% compared to that of non-coated. Localized pitting attacks occurred in the vicinity of Al?Mn and ß?Mg17Al12 cathodic particles characteristic of the Mg matrix. The depth of penetration (?23 µm) was reduced by ?85% compared to that of non-coated substrates. The protective effect against Cl ions, attributed to the hybrid PS?ZrO2-coated AM60 and AM60?AlN surfaces, was confirmed by the increase in their polarization resistance (Rp) in 37% and 22%, respectively, calculated from EIS data.