Article
Chemistry, Physical
Vincenzo Verro, Francesco Di Franco, Andrea Zaffora, Monica Santamaria
Summary: Electrodeposition was used to create superhydrophobic coatings on anodized AA7075 alloy in order to enhance its corrosion resistance. Different compositions of the electrodeposition bath were tested, with the Mn-containing coating showing the highest contact angle value (close to 160 degrees) and corrosion resistance. The coatings also exhibited high stability after 21 days of immersion in a seawater-like solution. Experiments on flat pellet samples allowed for the estimation of the vacuum fraction of the superhydrophobic coatings.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
S. Abirami, T. Bharathidasan, S. Sathiyanarayanan, C. Arunchandran
Summary: The study investigated the active corrosion protection provided by superhydrophobic cerium stearate coatings deposited on anodized AA2024-T3 using a simple DC electrodeposition technique. The dual-scale micro/nano hierarchical texture of cerium stearate formed through a 120-minute electrodeposition process showed excellent self-cleaning property, chemical stability, environmental stability, and mechanical durability acceptable for industrial applications. The electrodeposited cerium stearate coating demonstrated active corrosion protection based on self-healing ability by releasing cerium (Ce3+) ions.
Article
Chemistry, Physical
Talal A. Aljohani, Majed O. Alawad, Sally Elkatatny, Abdulrahman I. Alateyah, Meteb T. Bin Rubayan, Mohammed A. Alhajji, Muntathir I. Al Beladi, Fuad Khoshnaw, Waleed H. El-Garaihy
Summary: This study enhanced the corrosion performance of AA2014 aluminum alloy by applying a silica (SiC) coating using the plasma electrolytic oxidation (PEO) process. The microstructure and electrochemical behavior of the coated samples were investigated with different electrical parameters and with or without SiC. The results showed that the SiC-PEO-coated samples exhibited significantly decreased corrosion rate compared to the uncoated alloy.
Article
Nanoscience & Nanotechnology
Sivaranjani Devarakonda, Baskar Ganapathysubramanian, Pranav Shrotriya
Summary: The study presents an experimental and computational approach for developing a highly sensitive and responsive label-free biosensor based on aptamer-functionalized transparent electrode. The sensor shows sensitive and specific thrombin protein detection with a high signal-to-noise ratio. Computational and experimental results indicate that the sensing response is due to modified ionic transport under the combined influence of steric hindrance and surface charge modification.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Electrochemistry
Bahareh Javanpour, Maziyar Azadbeh, Mahdi Mozammel
Summary: In this study, a hydrophilic surface was treated with trimethoxypropylsilane (TMPSi) sol to create a bilayer surface, resulting in enhanced hydrophobicity. The surface roughness increased after modification and the charge transfer resistance dramatically rose, indicating improved performance.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Badr Baach, Moussa Ouakki, Soumya Ferraa, Hanane Barebita, Mohammed Cherkaoui, Abderrazak Nimour, Taoufik Guedira
Summary: New crystalline compounds based on an oxygen-deficient fluorite structure were synthesized and tested as corrosion inhibitors for mild steel in hydrochloric acid solution. The inhibitor efficiency was observed to increase with concentration, reaching a maximum of 93.7% for one compound at room temperature. The inhibitors exhibited excellent performance, although their effectiveness decreased at higher temperatures. Thermodynamic parameters were also calculated and discussed.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Youhai Liu, Nan Zhang, Dylan Tua, Yingkun Zhu, Jacob Rada, Wenhong Yang, Haomin Song, Alexis C. Thompson, R. Lorraine Collins, Qiaoqiang Gan
Summary: A superhydrophobic SERS chip combining 3D-assembled gold nanoparticles on nanoporous substrates is proposed for sensitive analyte enrichment. The chip demonstrates a sensitivity of 1 nm and a relative standard deviation of 2.2% for chip-to-chip reproducibility, showing potential for quantitative sensing of chemicals and drugs. It also enables trace analysis of fentanyl and fentanyl-heroin mixture in human saliva. This superhydrophobic chip paves the way for on-site and real-time drug sensing to tackle societal issues like drug abuse and the opioid crisis.
Article
Materials Science, Multidisciplinary
Giulia Scampone, Giulio Timelli
Summary: The effects of hydrothermal and cold sealing processes on the scratch and wear resistance of the anodic layer were studied. The sealing processes enhanced the wear and scratch resistance by sealing the surface porosity. A thicker oxide layer on the milled substrate led to greater wear resistance. A cracked mechanically mixed layer was formed on the anodized surfaces at the end of the wear tests.
Article
Materials Science, Multidisciplinary
R. K. Singh Raman, Abhishek Kumar Arya, Kevin Tomy, Faisal A. Dip, Evelyn Lai, Saad Al-Saadi
Summary: Graphene coatings improve the corrosion resistance of nickel and copper. The performance of multilayer graphene coating remains consistent in different corrosive environments. However, the improvement in corrosion resistance is more significant in highly corrosive sulfuric acid environment for bare nickel.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Marlon L. Mopon Jr, Jayson S. Garcia, Dexter M. Manguerra, Cyril John C. Narisma
Summary: The use of gallic acid as an additive in sulfuric acid anodization can improve the corrosion resistance of anodized aluminum, but higher current density may lead to decreased corrosion resistance. Under certain conditions, adding low concentrations of gallic acid can result in better corrosion performance of anodized aluminum samples.
Article
Chemistry, Multidisciplinary
Priya Kesari, G. Udayabhanu, Arpita Roy, Sagar Pal
Summary: Green biopolymeric materials and their hybrid nanocomposites were investigated for corrosion prevention of mild steel in 15% HCl. The results showed that the SA-g-PMMA/TiO2 exhibited the highest inhibition efficiency of 97.28%, followed by SA-g-PMMA/Fe3O4 with 96.82% efficiency, while unmodified sodium alginate only showed 84.74% efficiency. The inhibition efficiency decreased with increasing temperature, and the inhibitors followed Langmuir adsorption isotherm. The nanocomposites formed a better protective adsorption layer on the exposed metallic surface compared to sodium alginate alone, as observed from FE-SEM and AFM analysis. The elemental composition of the adsorbed film was determined using XPS technique. Density Functional Theory (DFT) results supported the experimental outcomes.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Oscar Mauricio Prada Ramirez, Matheus Araujo Tunes, Marina Martins Mennucci, Maksim Starykevich, Cristina Neves, Mario G. S. Ferreira, Stefan Pogatscher, Hercilio Gomes De Melo
Summary: The effect of a post-treatment for a short time in 50 mM Ce(NO3)3 solution on the corrosion of AA2024-T3 anodized in tartaric-sulfuric acid was investigated. The tests showed that post-treatment at 50 degrees Celsius in an H2O2-containing solution improved the performance of the samples. Microstructural characterization revealed the presence of Ce oxy-hydroxides on the surface and within the pores of the anodized layer, indicating their preferential interaction with defective sites at both micro and nanoscale. The presence of Ce-species near corrosion products indicated active corrosion protection by Ce ions.
Article
Materials Science, Multidisciplinary
Ehab AlShamaileh, Abdelmnim M. Altwaiq, Muayad Esaifan, Heba Al-Fayyad, Ziad Shraideh, Iessa Sabbe Moosa, Imad Hamadneh
Summary: This study examines the microstructures and corrosion resistance of commercial non-colored anodized aluminum and commercial blackened anodized aluminum as solar absorbing surfaces. The results indicate that the blackened anodized aluminum exhibits superior solar radiation absorption and corrosion resistance properties. Experimental testing also demonstrates the advantages of using a double-glazed cover in solar radiation collection compared to a single-glazed setup.
Article
Materials Science, Multidisciplinary
S. S. Subramanian, D. Maruthamani, M. Kumaravel
Summary: This work describes the fabrication of superhydrophobic surfaces on anodized aluminum substrates using cost-effective chemicals through a simple immersion process. By treating the anodized and sealed aluminum substrate with formic acid, formate-alumoxane can be formed. The formate ions are replaced by higher-order carboxylates through treatment with sodium salts of higher-order carboxylic acids. The as-prepared superhydrophobic aluminum substrates exhibit high water contact angle and low sliding angle, as well as good resistance against abrasion, UV, environmental and thermal stabilities. Without the use of expensive chemicals and sophisticated machinery, aluminum substrates of any size, shape and surface finish can be easily rendered robust and superhydrophobic.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Polymer Science
Tian Shi, Jingsong Liang, Xuewu Li, Chuanwei Zhang, Hejie Yang
Summary: This study prepared a multifunctional aviation aluminum alloy with good superhydrophobicity and corrosion resistance through a two-step process of etching followed by polymer modification, resulting in the formation of micro- and nanostructures on the surface. The liquid contact angle was increased, and the corrosion resistance was improved.
