Rapid Fabrication of a Crystalline Myristic Acid-Based Superhydrophobic Film with Corrosion Resistance on Magnesium Alloys by the Facile One-Step Immersion Process

Abstract

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.

Fabrication of cerium myristate coating for a mechanochemically robust modifier-free superwettability system to enhance the corrosion resistance on 316L steel by one-step electrodeposition

“…[46]. The peak for the carboxylic carbonyl stretching vibration at 1702 cm -1 was not present in FT-IR spectra of the SHP sample while compared to myristic acid peaks in the previous studies of research work [28].…”

“…For the fabrication of superhydrophobic Ni [24], Cu [25], Co [26], and Mn [27] surfaces by electrodeposition process using electrolytic solutions consists of salts of Mn, Ce, La, Ni, Cu or Co, myristic acid and ethanolic solution. Myristic acid is promising a less expensive and powerful reagent to reduce the surface energy [28][29][30] of material surface as compared to the polymers using fluorination. Among the formation of superhydrophobic coating on different substrates, long term durability is the main concern that confines their practical and industrial applications [31][32][33][34].…”

Research Progress on Corrosion Resistance of Magnesium Alloys with Bio-inspired Water-repellent Properties: A Review

“…In addition, compared with the AZ31B substrate, the coating had anti-bioadhesion properties, which greatly reduced the adhesion of biomolecules (proteins, bacteria and cells). Ishizaki et al [214] prepared myristic acid modified micro/nano structure on the surface of AZ31 alloy by one-step dipping method, and the Fig. 13 (a) SEM morphology and rolling angle (inset) of EP+PDMS@SiO2 coating, (b) potential polarization curves of magnesium alloy substrate and EP+PDMS@SiO2 coating, (c) self-healing cycles of superhydrophobic coating, (d) XPS analysis of EP+PDMS@SiO2 coating during self-healing [208] .…”

Thermally Induced Gradient of Properties on a Superhydrophobic Magnesium Alloy Surface

“…The fabrication of superhydrophobic coatings on the surface of magnesium alloys in recent years caused particular interest [35][36][37][38][39][40], which is associated, on the one hand, with the initial low corrosion resistance of these alloys. On the other hand, magnesium and its alloys are in high demand in various applications [41,42].…”