“…13 shows that the water droplet contact angle increases from a small acute value of 59.7° for the bare surface to a large obtuse angle value of 101.2° for the coated sample. This detection clearly demonstrates that in saline solution the surface film of Ch/GA nanocomposite coating is smoother and has more strengthen hydrophobic property as compared to the bare corroded mild steel surface 60 . Figure 13 Water droplet contact angle on mild steel surfaces exposed 24 h to 3.5 wt.% NaCl solution: ( a ) bare surface, and ( b ) coated surface by Ch/GA nanocomposite.…”
The application of green and sustainable anticorrosive coatings is becoming of upsurge interest for the protection of metallic materials in aggressive environments. Herein, a stable crystalline chitosan/gum Arabic composite (CGAC) nanopowder was successfully synthesized and characterized by various methods. The CGAC nanopowder with different doses (25, 50, 100, and 200 ppm) was used to coat mild steel samples and examined its anticorrosion ability in 3.5 wt.% NaCl solution using gravimetric, electrochemical measurements, and surface characterization techniques. All methods yielded consistent results revealing that nanocomposite coatings can impart good anticorrosive properties to the steel substrate. The obtained protection efficiency was enhanced with increasing CGAC dose in the applied surface layer achieving 96.6% for the 200 ppm-coating. SEM and AFM surface morphologies of uncoated and coated samples after the inundation in the saline solution showed that CGAC coating can block the active corrosive sites on the steel surface, and prevent the aggressive Cl- ions from attacking the metallic substrate. The water droplet contact angle gave further support as it increased from 50.7° for the pristine uncoated surface to 101.2° for the coated one. The current research demonstrates a promising natural and reliable nanocomposite coating for protecting mild steel structures in the marine environment.
“…13 shows that the water droplet contact angle increases from a small acute value of 59.7° for the bare surface to a large obtuse angle value of 101.2° for the coated sample. This detection clearly demonstrates that in saline solution the surface film of Ch/GA nanocomposite coating is smoother and has more strengthen hydrophobic property as compared to the bare corroded mild steel surface 60 . Figure 13 Water droplet contact angle on mild steel surfaces exposed 24 h to 3.5 wt.% NaCl solution: ( a ) bare surface, and ( b ) coated surface by Ch/GA nanocomposite.…”
The application of green and sustainable anticorrosive coatings is becoming of upsurge interest for the protection of metallic materials in aggressive environments. Herein, a stable crystalline chitosan/gum Arabic composite (CGAC) nanopowder was successfully synthesized and characterized by various methods. The CGAC nanopowder with different doses (25, 50, 100, and 200 ppm) was used to coat mild steel samples and examined its anticorrosion ability in 3.5 wt.% NaCl solution using gravimetric, electrochemical measurements, and surface characterization techniques. All methods yielded consistent results revealing that nanocomposite coatings can impart good anticorrosive properties to the steel substrate. The obtained protection efficiency was enhanced with increasing CGAC dose in the applied surface layer achieving 96.6% for the 200 ppm-coating. SEM and AFM surface morphologies of uncoated and coated samples after the inundation in the saline solution showed that CGAC coating can block the active corrosive sites on the steel surface, and prevent the aggressive Cl- ions from attacking the metallic substrate. The water droplet contact angle gave further support as it increased from 50.7° for the pristine uncoated surface to 101.2° for the coated one. The current research demonstrates a promising natural and reliable nanocomposite coating for protecting mild steel structures in the marine environment.
“…It is widely used for numerous applications such as gas sensors [11], biosensors [12], drugs, cosmet-ics, storage, optical and electrical devices, solar cells [13], and biomedical applications [14][15][16][17]. To deposit ZnO thin film, several methods have been often used such as chemical vapor deposition [18,19], pulsed laser deposition [10,20], atomic layer deposition (ALD) [21,22], spray pyrolysis [13], RF magnetron sputtering [23,24], plasma spraying [25], dipcoating method [26], electron beam (e-beam) evaporation [27], chemical bath deposition [28], chemical oxidative polymerization [29], plasma electrolytic oxidation (PEO) [30], electrophoretic deposition (EPD) [31], and sol-gel [32], etc. Among these methods, we are going to focus on the spray ultrasonic technique [33] because of its simplicity and suitability for large-scale production.…”
This investigation aims to improve the properties of 304 L stainless steel (SS) substrates for use in corrosion, mechanical, and biomedical applications by depositing ZnO thin films. The ultrasonic spraying technique was used to prepare ZnO thin films with depositional times of 1, 4, and 9 minutes. XRD and Raman studied the surface characteristics of ZnO samples. XRD analysis revealed a hexagonal structure with an average crystallite size of 22 nm for ZnO. Indentation nano measurements indicated an increase in the hardness of the films examined. To determine the type of conductivity and estimate the charge carrier density, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and Mott-Schottky analysis were performed. The thin film deposited for 9 minutes was found to be the most effective in improving corrosion resistance.
“…Application of protective and biocompatible organic coatings is an effective technique applied on Mg alloys [ 13 ]. The coatings are applied with different methods such as dip coating [ 14 ], spin coating [ 15 ], electrophoretic deposition [ 16 , 17 ] and electrospinning [ 18 ].…”
Mg-based biomaterials are commonly used as biodegradable orthopedic implants (e.g., bone regeneration applications). However, achieving high biocompatibility and corrosion resistance has remained a challenge to be tackled. In this work, to investigate various fabricated coatings (with and without pre- anodizing), five categories of samples are considered: (a) bare Mg alloy (Mg), (b) Anodized Mg alloy (Mg-A), (c) CS-coated Mg alloy (Mg-C), (d) CS-coated anodized Mg alloy (Mg-AC), and (e) CS-CNT-coated anodized Mg alloy (Mg-ACC). These samples were characterized by using Field Emission Scanning Electron Microscopes (FE-SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FT-IR), and Raman Spectroscopy. The adhesion within the coated samples was compared. Then, the effects of the coatings were evaluated by comparing wettability, corrosion behavior, and biocompatibility for bare and coated samples. The adhesion test showed that the coatings exhibited higher adhesion for Mg-AC and Mg-ACC compared to Mg-C. Desired wettability was achieved as the contact angles of coated samples were in the range of 55°– 65°. Electrochemical impedance and polarization as well as immersion tests showed higher corrosion resistance for coated samples. The composite coated sample showed improved cell adhesion since the osteoblast cells covered almost the entire surface of the sample. Moreover, osteoblast cell viability for the sample was around 40% higher than that of the bare sample.
Graphical abstract
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