scholarly journals Deposition of Zinc–Cerium Coatings from Deep Eutectic Ionic Liquids

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2035
Author(s):  
Miguel Marín-Sánchez ◽  
Elena Gracia-Escosa ◽  
Ana Conde ◽  
Carlos Palacio ◽  
Ignacio García
Keyword(s):  
Carbon Steel ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
Steel Substrate ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Electrochemical Corrosion ◽  
Corrosion Properties ◽  
Corrosion Tests ◽  
X Ray

This work studies the electrodeposition of zinc and cerium species on carbon steel substrates from choline chloride-based ionic liquid bath in order to develop a protective coating with anti-corrosion, sacrificial, and self-repairing properties. Hull cell tests were used to study the influence of the current density on composition of the coatings and their morphology. Surface morphology, chemical composition and oxidation state of the obtained coatings were examined by scanning electron microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS), respectively. Furthermore, electrochemical characterization and corrosion tests were performed in order to evaluate the corrosion properties of the electrodeposited Zn–Ce coatings. The cathodic deposition of Zn–Ce was achieved for the first time using the deep eutectic solvent choline chloride-urea as an electrolyte. Cerium was incorporated in the coating as oxide or mixed oxide within the Zn metal matrix. The composition and morphology of the electrodeposited coating were dependent on the applied current density. Electrochemical corrosion tests showed similar corrosion rates for all the coatings. Nevertheless on scratched tests with a ratio area of 15:1, for Zn–Ce coatings cerium oxide somehow migrates from the coating to the high pH cathodic areas developed on the surface of the bare steel substrate. Further study is still necessary to improve the corrosion protection of the Zn–Ce coating for carbon steel.

Fabrication of Ag@AgCl with Enhanced Plasmonic Photocatalysis Performance via a Deep Eutectic Solvent

2019 ◽  
Vol 72 (3) ◽  
pp. 200 ◽  
Author(s):  
Jianhua Ge ◽  
Yuchong Chen ◽  
Jing Xu ◽  
Yujie Liu ◽  
Long Zhang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Photocatalytic Oxidation ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Oxidation Mechanism ◽  
Photocatalytic Property ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plasmonic Photocatalyst ◽  
Facile Solvothermal Method

The plasmonic photocatalyst Ag@AgCl was successfully prepared through a facile solvothermal method via a deep eutectic solvent (DES), which is composed of choline chloride and urea. X-Ray diffraction, scanning electron microscopy, energy-dispersive X-ray, element-mapping, X-ray photoelectron spectroscopy, N2 absorption–desorption, and UV-vis diffuse reflectance techniques were adopted to analyse the performance of the plasmonic photocatalyst. Characterisation results indicated that the DES not only served as a solvent and Cl source, but also as a reductant. Meanwhile, the probable mechanism for the formation of Ag@AgCl is discussed, which revealed a visible light enhanced photocatalytic property for the degradation of benzidine. Furthermore, the photocatalyst showed no decrease in its catalytic activity even after five cycles of operation. Finally, a possible photocatalytic oxidation mechanism of Ag@AgCl is proposed.

Effects of Al2O3 Additive on Manganese Phosphate Conversion Coating of Carbon Steel

2018 ◽  
Vol 932 ◽  
pp. 81-90
Author(s):  
Young Tai Noh ◽  
Young Min Byoun ◽  
Ho Young Kim ◽  
Ho Sang Kang ◽  
Jong Kyu Park ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Photoelectron Spectroscopy ◽  
Composite Coatings ◽  
Electrochemical Corrosion ◽  
Micro Hardness ◽  
X Ray ◽  
Manganese Phosphate ◽  
Corrosion Behaviors ◽  
Main Component

In this study, the effects of Al2O3additives on the anticorrosion and tribological properties of Mn3(PO4)2-coated carbon steel were investigated. The microstructure and morphology of the coatings were studied by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The Vickers micro-hardness and wear resistance of the produced composite coatings were evaluated and compared with those of the non-composited Mn3(PO4)2coating. The electrochemical corrosion behaviors of the prepared coatings were investigated in a 3.5 wt.% NaCl solution by a potentiostat–galvanostat device to determine the effects of Al2O3on the formation of Mn3(PO4)2coatings on steel. Mn3(PO4)2composite conversion coatings were successfully created by chemical treatment, with the main component of hureaulite [(Mn,Fe)5H2(PO4)4∙4H2O]. The micro-hardness, wear resistance, corrosion performance, and passivation behaviors of the coatings were improved by adding Al2O3particles. The optimum concentration of Al2O3particles in the Mn3(PO4)2coating to attain the best microstructure, wear resistance properties, and corrosion resistance was 10 g/L.

scholarly journals Green Preparation of High Surface Area Cu-Au Bimetallic Nanostructured Materials by Co-Electrodeposition in a Deep Eutectic Solvent

2021 ◽  
Author(s):  
Elena Plaza Mayoral ◽  
Paula Sebastián Pascual ◽  
Kim Nicole Dalby ◽  
Kim Degn Jensen ◽  
Ib Chorkendorff ◽  
...  
Keyword(s):  
Surface Area ◽  
Nanostructured Materials ◽  
Photoelectron Spectroscopy ◽  
Choline Chloride ◽  
High Surface ◽  
High Surface Area ◽  
Deep Eutectic Solvent ◽  
Fold Increase ◽  
Active Surface Area ◽  
X Ray

In this work we present an electrodeposition method in a deep eutectic solvent (DES) to prepare bimetallic high surface area nanostructures of Cu and Au with tunable structure and composition. The metal electrodeposition performed in green choline chloride within a urea deep eutectic solvent allows us to tailor the size, morphology and elemental composition of the deposits. We combine electrochemical methods with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) to characterize the electrodeposited nanostructured materials. We assess the increase of the electroactive surface area through the analysis of the lead underpotential deposition (UPD) on the prepared films. We observe a 5 to 15-fold increase of the active surface area compared to flat surfaces of polycrystalline Cu or Au. Our work reports, for the first time, a green route for the electrodeposition of Cu-Au bimetallic nanostructures in a deep eutectic solvent.

scholarly journals Green Preparation of High Surface Area Cu-Au Bimetallic Nanostructured Materials by Co-Electrodeposition in a Deep Eutectic Solvent

2021 ◽  
Author(s):  
Elena Plaza Mayoral ◽  
Paula Sebastián Pascual ◽  
Kim Nicole Dalby ◽  
Kim Degn Jensen ◽  
Ib Chorkendorff ◽  
...  
Keyword(s):  
Surface Area ◽  
Nanostructured Materials ◽  
Photoelectron Spectroscopy ◽  
Choline Chloride ◽  
High Surface ◽  
High Surface Area ◽  
Deep Eutectic Solvent ◽  
Fold Increase ◽  
Active Surface Area ◽  
X Ray

In this work we present an electrodeposition method in a deep eutectic solvent (DES) to prepare bimetallic high surface area nanostructures of Cu and Au with tunable structure and composition. The metal electrodeposition performed in green choline chloride within a urea deep eutectic solvent allows us to tailor the size, morphology and elemental composition of the deposits. We combine electrochemical methods with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) to characterize the electrodeposited nanostructured materials. We assess the increase of the electroactive surface area through the analysis of the lead underpotential deposition (UPD) on the prepared films. We observe a 5 to 15-fold increase of the active surface area compared to flat surfaces of polycrystalline Cu or Au. Our work reports, for the first time, a green route for the electrodeposition of Cu-Au bimetallic nanostructures in a deep eutectic solvent.

scholarly journals Effect of CO2 Partial Pressure on the Corrosion Inhibition of N80 Carbon Steel by Gum Arabic in a CO2-Water Saline Environment for Shale Oil and Gas Industry

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4245
Author(s):  
Gaetano Palumbo ◽  
Kamila Kollbek ◽  
Roma Wirecka ◽  
Andrzej Bernasik ◽  
Marcin Górny
Keyword(s):  
Carbon Steel ◽  
Partial Pressure ◽  
Corrosion Inhibition ◽  
Photoelectron Spectroscopy ◽  
Inhibition Efficiency ◽  
Gum Arabic ◽  
Saline Environment ◽  
X Ray ◽  
Co2 Partial Pressure ◽  
Corrosion Inhibition Efficiency

The effect of CO2 partial pressure on the corrosion inhibition efficiency of gum arabic (GA) on the N80 carbon steel pipeline in a CO2-water saline environment was studied by using gravimetric and electrochemical measurements at different CO2 partial pressures (e.g., PCO2 = 1, 20 and 40 bar) and temperatures (e.g., 25 and 60 °C). The results showed that the inhibitor efficiency increased with an increase in inhibitor concentration and CO2 partial pressure. The corrosion inhibition efficiency was found to be 84.53% and 75.41% after 24 and 168 h of immersion at PCO2 = 40 bar, respectively. The surface was further evaluated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), grazing incidence X-ray diffraction (GIXRD), and X-ray photoelectron spectroscopy (XPS) measurements. The SEM-EDS and GIXRD measurements reveal that the surface of the metal was found to be strongly affected by the presence of the inhibitor and CO2 partial pressure. In the presence of GA, the protective layer on the metal surface becomes more compact with increasing the CO2 partial pressure. The XPS measurements provided direct evidence of the adsorption of GA molecules on the carbon steel surface and corroborated the gravimetric results.

scholarly journals Reduced Graphene Oxide–Epoxy Grafted Poly(Styrene-Co-Acrylate) Composites for Corrosion Protection of Mild Steel

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 666
Author(s):  
Xinchuan Fan ◽  
Yue Hu ◽  
Yijun Zhang ◽  
Jiachen Lu ◽  
Xiaofeng Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Scanning Electron

Reduced graphene oxide–epoxy grafted poly(styrene-co-acrylate) composites (GESA) were prepared by anchoring different amount of epoxy modified poly(styrene-co-acrylate) (EPSA) onto reduced graphene oxide (rGO) sheets through π–π electrostatic attraction. The GESA composites were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The anti-corrosion properties of rGO/EPSA composites were evaluated by electro-chemical impedance spectroscopy (EIS) in hydroxyl-polyacrylate coating, and the results revealed that the corrosion rate was decreased from 3.509 × 10−1 to 1.394 × 10−6 mm/a.

Effect of Bismuth on the Microstructure and Corrosion Resistance of Galvanized Coating

2011 ◽  
Vol 391-392 ◽  
pp. 1183-1188 ◽  
Author(s):  
Jian Hua Wang ◽  
Xing Ming Wang ◽  
Chun Mei Liu ◽  
Xu Ping Su ◽  
Chang Jun Wu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electrochemical Corrosion ◽  
Energy Dispersive ◽  
Phase Layer ◽  
Corrosion Tests ◽  
X Ray ◽  
Galvanized Coating ◽  
Scanning Electron

The microstructure of the galvanized coating was investigated using scanning electron microscope equipped with energy dispersive X-ray spectroscope. The immersing and electrochemical corrosion tests were carried out to study the corrosion resistance of the galvanized coating. The addition of Bi in Zn-bath affects remarkably the morphology of the galvanized coating. The thickness of δ + ζ phase layer in the coating reaches the maximum when the content of Bi in Zn-bath is 0.5 wt.%. The corrosion resistance of the galvanized coating declines with the increase of the content of Bi.

Ionothermal Synthesis of Sodalite from Metakaolin

2012 ◽  
Vol 487 ◽  
pp. 789-792
Author(s):  
Xin Tao Zhou ◽  
Qi Feng Liu ◽  
Ying Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Infrared Spectrum ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Property ◽  
Ionothermal Synthesis ◽  
Scanning Electron

The sodalite was prepared with metakaolin by the ionothermal method in deep eutectic solvent(choline chloride/urea). Such factors as the Na2O/SiO2 ratio, crystallization temperature and time had effects on the structure and property. The high crystallinity and purity of sodalite can be obtained at the Na2O/SiO2 ratio of 3:1, and the temperature of 180°C for 60h. The product was characterized by means of X-ray diffraction, Infrared spectrum and scanning electron microscopy.

Simplified Synthesis of 3D Flexible Reduced Graphene Oxide-Wrapped NiCo2O4 Nanowires for High-Performance Supercapacitor

2018 ◽  
Vol 10 (3) ◽  
pp. 358-364 ◽  
Author(s):  
Chao Pan ◽  
Hongyu Sun ◽  
Jingyi Gao ◽  
Yucai Hu ◽  
Jing Wang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
High Current Density ◽  
Three Dimensional ◽  
Simple Method ◽  
X Ray ◽  
Reduced Graphene

We introduced a simple method to construct novel three-dimensional (3D) flexible hierarchical nanocomposites by combining (1D) NiCo2O4 nanowires with 2D reduced graphene oxide (rGO) sheets. The hierarchical nanocomposite structure of rGO-wrapped NiCo2O4 (rGO-NiCo2O4) was confirmed by X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). The results indicated that NiCo2O4 nanowires were successfully wrapped in rGO and the morphology of the rGO-NiCo2O4 showed a three-dimensional porous structure with NiCo2O4 being homogeneously distributed in the rGO. Given their apparent advantages, these two different nanostructures were evaluated as electrodes for high-performance supercapacitors. These electrodes exhibited a high capacitance of 1824.8 F·g–1 at a current density of 0.5 A·g–1, and an excellent cycling performance extending to 5000 cycles at a high current density of 4 A·g–1. Our results clearly demonstrate that rGO sheets on NiCo2O4 nanowires can substantially improve the capacitive performance of materials and ultimately increase the cycling stability of supercapacitors. The hierarchical binary nanocomposites show excellent electrochemical properties for energy storage applications, evidencing their potential application as supercapacitors.

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