A simple, easy, and rapid process of fabricating superhydrophobic surfaces on magnesium alloy
AZ31 by a one-step immersion at room temperature was developed. The
myristic acid-modified micro-/nanostructured surfaces showed static
water contact angles over 150° and water contact angle hysteresis
below 10°, thus illustrating superhydrophobic property. The shortest
treatment time for obtaining the superhydrophobic surfaces was 30
s. In addition, we demonstrated for the first time that crystalline
solid myristic acid could be formed on a Mg alloy using a suitable
molar ratio of Ce ions and myristic acid. The contact angle hysteresis
was lowered with an increase in the immersion time. Potentiodynamic
polarization curve measurements revealed that the corrosion resistance
of AZ31 treated by the immersion process improved considerably by
the formation of superhydrophobic surfaces. The chemical durability
of the superhydrophobic surfaces fabricated on AZ31 was also examined.
The static water contact angle values for the superhydrophobic surfaces
after immersion in aqueous solutions at pHs 4, 7, and 10 for 12 h
were estimated to be 90 ± 2°, 119 ± 2°, and 138
± 2°, respectively, demonstrating that their chemical durability
in a basic solution was high.
Corrosion resistant films were prepared on flame-resistant Mg-6Al-1Zn-2Ca (in mass%) alloy by steam coating using ultra pure water as steam source. The prepared films were characterized using SEM, XRD, and FT-IR. Corrosion resistance of the film was estimated by polarization curve measurement in 5 mass% NaCl aqueous solution. All XRD patterns of the films coated Mg-6Al-1Zn-2Ca alloy revealed that all films were composed of crystalline Mg(OH) 2 and Mg-Al layered double hydroxide (LDH). FT-IR spectra showed that the Mg-Al LDH had carbonate-and nitrate-ions in the interlayer. Potentiodynamic polarization curves of the film prepared at 433 K for 6 h indicated that the corrosion current density decreased by more than four orders of magnitude as compared to that of the uncoated Mg-6Al-1Zn-2Ca alloy.
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