scholarly journals Effect of Incorporated ZnO Nanoparticles on the Corrosion Performance of SiO2 Nanoparticle-Based Mechanically Robust Epoxy Coatings

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3767
Author(s):  
Ubair Abdus Samad ◽  
Mohammad Asif Alam ◽  
Arfat Anis ◽  
El-Sayed M. Sherif ◽  
Sulaiman I. Al-Mayman ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Epoxy Coating ◽  
Morphological Properties ◽  
Corrosion Performance ◽  
X Ray Diffraction ◽  
Coating Formulation ◽  
Steel Substrates ◽  
Saline Test

This paper presents the studies of the development of a high-performance epoxy coating for steel substrates. To this end, it investigated the synergistic effect of incorporating zinc oxide (ZnO) nanoparticles into nanosilica containing epoxy formulations. The mechanical properties of the epoxy coating formulations were improved by modifying the surfaces of the silica nanoparticles (5 wt.%) with 3-glycidoxypropyl trimethoxysilane, which ensured their dispersal through the material. Next, the ZnO nanoparticles (1, 2, or 3 wt.%) were incorporated to improve the corrosion performance of the formulations. The anticorrosive properties of the coatings were examined by electrochemical impedance spectroscopy (EIS) of coated mild steel specimens immersed in 3.5% NaCl solution over different time intervals (1 h to 30 days). Incorporation of the ZnO nanoparticles and the nanosilica into the coating formulation improved the corrosion resistance of the epoxy coating even after long-term exposure to saline test solutions. Finally, to evaluate how the nanoparticles affected the chemical and morphological properties of the prepared coatings, the coatings were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD).

scholarly journals Influence of SiO2 Content and Exposure Periods on the Anticorrosion Behavior of Epoxy Nanocomposite Coatings

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 118 ◽  
Author(s):  
Alam ◽  
Samad ◽  
Sherif ◽  
Poulose ◽  
Mohammed ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Sio2 Nanoparticles ◽  
Epoxy Coating ◽  
Properties Of Coatings ◽  
Ft Ir ◽  
Eis Measurements ◽  
Coating Formulations

Epoxy coating formulations containing 1%, 3%, and 5% SiO2 nanoparticles were produced and applied on a mild steel substrate to achieve the objective of high performance corrosion resistance. The electrochemical impedance spectroscopy (EIS) technique was employed to measure the anticorrosive properties of coatings. The corrosion tests were performed by exposing the coated samples in a solution of 3.5% NaCl for different periods of time, varied from 1 h and up to 30 days. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) analyses revealed the presence of nanoparticles in the final cured samples. Establishing the incorporation of the nanoparticles in the coating formulations was confirmed by employing both of XRD and FT-IR techniques. The FT-IR spectra have proved to be satisfactory indicating that there was a complete reaction between the epoxy resin with the hardener. EIS measurements confirmed that the presence and the increase of SiO2 nanoparticles greatly improved the corrosion resistance of the epoxy coating. The highest corrosion resistance for the coatings was obtained for the formulation with 5% SiO2 nanoparticles content, particularly with prolonging the immersion time to 30 days.

Effect of polyaniline/organophilic montmorillonite composites on properties of epoxy coating

2014 ◽  
Vol 32 (5-6) ◽  
pp. 227-236 ◽  
Author(s):  
Yingjun Zhang ◽  
Jingwei Deng ◽  
Yawei Shao ◽  
Qiumei Shi ◽  
Guozhe Meng ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Electrochemical Impedance ◽  
Epoxy Coating ◽  
X Ray Diffraction ◽  
Hydrophobic Property ◽  
Scanning Calorimetry ◽  
Composite Powders ◽  
Organophilic Montmorillonite ◽  
Intercalation Polymerization

AbstractPolyaniline/organophilic montmorillonite (PANI/OMMT) composite powders were synthesized by in situ intercalation polymerization and were added to the epoxy coating as an anti-corrosive pigment. Fourier translation infrared spectroscopy (FT-IR), X-ray diffraction, and contact angle test were used to characterize the PANI/OMMT powders. The epoxy coating containing the PANI/OMMT powders was studied by electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and pull-off adhesion test. The results indicated that a unique combination of OMMT and PANI was realized by in situ intercalation polymerization, that the hydrophobic property of PANI/OMMT powders was enhanced and PANI/OMMT powders had good compatibility with epoxy resin, and that the anti-corrosive property of PANI/OMMT coating was better than that of epoxy resin coating.

Humidity Sensor Based on ZnO Nanorods Assembled by Dielectrophoresis

2011 ◽  
Vol 138-139 ◽  
pp. 1121-1125 ◽  
Author(s):  
Rui Bo Ai ◽  
Feng Juan Miao
Keyword(s):  
Zno Nanoparticles ◽  
High Performance ◽  
Humidity Sensor ◽  
Zno Nanorods ◽  
High Sensitivity ◽  
High Specific Surface Area ◽  
Morphological Properties ◽  
X Ray ◽  
Sensing Material ◽  
Interdigital Electrodes

The preparation and humidity sensing of nanorod-like ZnO materials are studied. Firstly, the ZnO nanoparticles with high specific surface area are prepared via chemical solution growth techniques. Then, some ZnO nanoparticles are manipulated by dielectrophoresis in interdigital electrodes to assemble a capacitive-type humidity sensor. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) are used to determine the structural and morphological properties. The results show that the sensor prototypes have high sensitivity, and it is the potential sensing material for high performance humidity sensors.

Effect of Polymeric Milling Media on the Mechanosynthesis and Structural Properties of Nanocrystalline Hydroxyapatite

2009 ◽  
Vol 283-286 ◽  
pp. 98-105 ◽  
Author(s):  
Ali Shokuhfar ◽  
Bahman Nasiri-Tabrizi ◽  
Omid Gashti ◽  
Reza Ebrahimi-Kahrizsangi
Keyword(s):  
Crystallite Size ◽  
High Performance ◽  
Average Crystallite Size ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Mechanochemical Process ◽  
Structural Evaluation ◽  
Transmission Electron ◽  
Nanocrystalline Hydroxyapatite ◽  
Xrd Patterns

Mechanochemical process in polymeric vials has been carried out successfully to produce nanocrystalline hydroxyapatite (HAp) through two different reactions R1 and R2. Morphological properties and structural evaluation of obtained materials are studied by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM). The obtained data show that the increase in milling time leads the increasing in lattice strain and decreasing in crystallite size. The average crystallite size of HAp is below 20 and 23 nm for R1 and R2 reactions, respectively. Based on XRD patterns and SEM/TEM micrographs, the possible formation mechanism of nanocrystalline hydroxyapatite by mechanochemical process in polymeric milling media is confirmed. Final results indicate that the nanocrystalline hydroxyapatite with low chemically stable contaminations and suitable morphology can be produced in Polyamide6 vials similar to stainless steel vials, therefore it seems that using polymeric vials could lead to a new way for the mass production of nanocrystalline hydroxyapatite with high performance, low contamination and cost and also suitable morphology.

scholarly journals Microwave-Assisted Synthesis and Characterization of γ-MnO2 for High-Performance Supercapacitors

2021 ◽  
Author(s):  
Lorena Cuéllar-Herrera ◽  
Elsa Arce-Estrada ◽  
Antonio Romero-Serrano ◽  
José Ortiz-Landeros ◽  
Román Cabrera-Sierra ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
High Performance ◽  
Pore Diameter ◽  
Electrochemical Impedance ◽  
High Specific Capacitance ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
20 Nm

AbstractTwo hydrothermal techniques under microwave irradiation were used to synthesize γ-MnO2 from 90°C to 150°C in 10−30 min. The first technique is based on reducing KMnO4 with MnSO4, and the second one involves liquid-phase oxidation between MnSO4 and (NH4)2S2O8. The structures and morphologies of the samples were analyzed using X-ray diffraction, scanning electron microscopy, and N2 physisorption measurements. The electrochemical properties were evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. The γ-MnO2 materials obtained by the first technique mainly exhibited nanorods with diameters of 40–60 nm, and the samples obtained by the second technique showed flower-like microspheres with diameters of 1−2 µm; each flower was composed of nanosheets with a thickness of 10−20 nm. The processing time directly depends on the size of the nanorods. The sample synthesized by the first technique at 150°C and 10 min has the highest specific surface area of up to 59.08 m2 g−1 and mean pore diameter of 34.11 nm. Furthermore, this sample exhibits a near-rectangular cyclic voltammetry curves and high specific capacitance of 331.3 F g−1 in 0.1 M Na2SO4 solution at 5 mV s−1 scan rate. Graphic abstract

Graphene-Carbon Nanotubes-Modified LiFePO4 Cathode Materials for High-Performance Lithium-Ion Batteries

2018 ◽  
Vol 913 ◽  
pp. 818-830 ◽  
Author(s):  
Yu Ting Chen ◽  
Hai Yan Zhang ◽  
Yi Ming Chen ◽  
Gai Qin ◽  
Xing Ling Lei ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Liquid Electrolyte ◽  
Cyclic Voltammograms ◽  
X Ray Diffraction ◽  
Conducting Networks ◽  
Electron Migration ◽  
Better Than

A nanocrystalline LiFePO4/graphene-carbon nanotubes (LFP-G-CNT) composite has been successfully synthesized by a hydrothermal method followed by heat-treatment. The microstructure and morphology of the LFP-G-CNTs composite were comparatively investigated with LiFePO4/graphene (LFP-G) and LiFePO4/carbon nanotubes (LFP-CNT) by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The LFP-G-CNTs nanoparticles were wrapped homogeneously and loosely within a 3D conducting network of graphene-carbon nanotubes. The conducting networks provided highly conductive pathways for electron transfer during the intercalation/deintercalation process, facilitated electron migration throughout the secondary particles, accelerated the penetration of the liquid electrolyte into the LFP-G-CNT composite in all directions and enhanced the diffusion of Li ions. The results indicate that the electrochemical activity of LFP-G-CNT composite may be enhanced significantly. The charge-discharge curves, cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) results demonstrate that LFP-G-CNT composite performes better than LFP-G and LFP-CNT composites. In particular, LFP-G-CNT composite with a low content of graphene and carbon nanotubes exhibites a high initial discharge capacity of 168.4 mAh g−1 at 0.1 C and 103.7 mAh g−1 at 40 C and an excellent cycling stability.

scholarly journals STUDY OF ZN-NI ALLOY COATINGSMODIFIED BY NANO-AL2O3 PARTICLES INCORPORATION

2016 ◽  
Vol 22 (3) ◽  
pp. 171 ◽  
Author(s):  
Malika Diafi ◽  
Said Benramache ◽  
Elhachmi Guettaf Temam ◽  
Adaika Mohamed Lakhdar ◽  
Brahim Gasmi
Keyword(s):  
Electrochemical Impedance ◽  
Research Work ◽  
Charge Transfer Resistance ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
Transfer Resistance ◽  
Characterization Methods ◽  
Ni Alloy ◽  
Steel Substrates

<p class="AMSmaintitle">Abstract</p><p class="Default">The aim of this research work was to codeposit nano-Al<sub>2</sub>O<sub>3</sub> particles into Zn-Ni alloy coatings in order to improve some surface ,properties, the influence of the concentration of Al2O3 is the principal object in order to improve the corrosion resistance of the deposit, which has been made by electroplating on steel substrates previously treated, have been studied by several characterization methods, as the X-ray diffraction, measurement of micro hardness and scanning electron microscopy (SEM), protection against corrosion properties studied in a solution of 3% NaCl in the potentiodynamic polarization measurements (Tafel), electrochemical impedance spectroscopy (EIS) to the potential of corrosion free. The parameters that characterize the corrosion behavior can be determined from the plots and Nyquist plots and chronopotentiometry. Trends of increasing the charge transfer resistance and the decrease of capacitance values. XRD and SEM results and identify any coatings Zn-Ni and Zn-Ni-Al<sub>2</sub>O<sub>3</sub> alloy composition have similar phase ( γ-phase structure) and the addition of Al<sub>2</sub>O<sub>3</sub> in the Zn-Ni matrix increases the microhardness, and we note the maximum hardness is obtained for 50 g/L Al<sub>2</sub>O<sub>3</sub>.</p><p class="Default"> </p>

scholarly journals rGO Sheets / ZnFe2O4 Nanocomposities as an Efficient Electro Catalyst Material for I3- / I- Reaction for High Performance DSSCs

2021 ◽  
Author(s):  
Anto feradrick Samson V ◽  
Bharathi Bernadsha S ◽  
Albin John P Paul Winston ◽  
Divya D ◽  
James Abraham ◽  
...  
Keyword(s):  
High Performance ◽  
Electrochemical Impedance ◽  
Low Cost ◽  
Dye Sensitized Solar Cells ◽  
X Ray Diffraction ◽  
Tafel Polarization ◽  
Highly Active ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Sensitized Solar Cells

Abstract In this paper, Reduced Graphene Oxide (rGO) / ZnFe2O4 (rZnF) nanocomposite is synthesized by a simple hydrothermal method and employed as a counter electrode (CE) material for tri-iodide redox reactions in Dye sensitized solar cells (DSSC) to replace the traditional high cost platinum (Pt) CE. X-ray diffraction analysis (XRD) and High resolution Transmission electron microscopy (HR-TEM), clearly indicated the formation of rZnF nanocomposite and also amorphous rGO sheets were smoothly distributed on the surface of ZnFe2O4 (ZnF) nanostructure. The rZnF-50 CE shows excellent electro catalytic activity toward I3− reduction, which has simultaneously been confirmed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Tafel polarization measurements. A DSSC developed by rZnF-50 CE (η = 8.71%) obtained quite higher than the Pt (η = 8.53%) based CE under the same condition. The superior performances of rZnF-50 CE due to addition of graphene in to Spinel (ZnF) nanostructure results in creation of highly active electrochemical sites, fast electron transport linkage between CE and electrolyte. Thus it’s a promising low cost CE material for DSSCs.

THE ELECTROCHEMICAL BEHAVIOR OF DOPED SILANE PRE-TREATMENTS ON GALVANIZED STEEL SUBSTRATES

2017 ◽  
Vol 24 (02) ◽  
pp. 1750015
Author(s):  
QILIANG ZHAO ◽  
WEI GUO ◽  
QINGDONG ZHONG ◽  
JUNLIANG ZHANG ◽  
JINHU SUN ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Barrier Properties ◽  
Galvanized Steel ◽  
Dynamic Polarization ◽  
Corrosion Performance ◽  
Surface Microstructures ◽  
Steel Substrates ◽  
Inhibition Ability ◽  
Silane Layer ◽  
Trimethoxy Silane

In this paper, galvanized steel substrates were pre-treated in [Formula: see text]-(2,3-epoxypropoxy)propyl trimethoxy silane solutions containing salts ((NH[Formula: see text]TiF6, K2ZrF6 and NaVO[Formula: see text] and SiO2. The surface microstructures of the coated substrates were evaluated by scanning electron microscopy (SEM). The anti-corrosion performance of the modified silane film applied on galvanized steel substrates was evaluated by potentio-dynamic polarization (Tafel) and electrochemical impedance spectroscopy (EIS). The electrochemical results reveal that the addition of salts ((NH[Formula: see text]TiF6, K2ZrF6 and NaVO[Formula: see text] may produce a more stable and protective fluoride combined with their oxides in the silane layer. The results also reveal that the addition of the SiO2 nanoparticles reinforced the barrier properties of the silane films and imparted its corrosion inhibition ability.

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