Surface modification of graphene-coated carbon steel using aromatic molecules for enhancing corrosion resistance; comparison between type of aryl substitution with different spatial situations

2018 ◽  
Vol 65 (3) ◽  
pp. 249-262 ◽  
Author(s):  
Zahra Shams Ghahfarokhi ◽  
Mojtaba Bagherzadeh ◽  
Ebrahim Ghiamati Yazdi ◽  
Abbas Teimouri
Keyword(s):  
Surface Modification ◽  
Carbon Steel ◽  
Corrosion Protection ◽  
Protection Efficiency ◽  
Graphene Surface ◽  
Content Type ◽  
X Ray ◽  
Aromatic Molecules ◽  
Proposed Modification ◽  
Coated Carbon

Purpose The purpose of this paper is study of the type of functional group and its situation on phenyl molecule, in increasing the corrosion protection of modified graphene layers by it. Corrosion protection efficiency of graphene was raised via modifying the surface of graphene-coated carbon steel (CS/G) by using aromatic molecules. Phenyl groups with three different substitutions including COOH, NO2 and CH3 grafted to graphene via diazonium salt formation route, by using carboxy phenyl, nitro phenyl and methyl phenyl diazonium salts in ortho, meta and para spatial situations. Design/methodology/approach Molecular bindings were characterized by using X-ray diffractometer, fourier-transform infrared spectroscopy (FTIR), Raman and scanning electron microscopy (SEM)/ energy dispersive X-ray analysis (EDXA) methods. Anti-corrosion performance of modified CS/G electrodes was evaluated by weight loss and electrochemical techniques, potentiodynamic polarization (Tafel) and electrochemical impedance spectroscopy, in 3.5 per cent NaCl solution. Findings The obtained results confirmed covalently bonding of phenyl groups to the graphene surface. Also, the observed results showed that substitution spatial situations on phenyl groups can affect charge transfer resistance (Rct), corrosion potential (Ecorr), corrosion current density (jcorr) and the slope of the anodic and cathodic reaction (ßa,c), demonstrating that the proposed modification method can hinder the corrosion reactions. The proposed modification led to restoring the graphene surface defects and consequently increasing its corrosion protection efficiency. Originality/value The obtained results from electrochemical methods proved that protection efficiency was observed in order COOH < NO2 < CH3 and MPD in the para spatial situation and showed the maximum protection efficiency of 98.6 per cent in comparison to other substitutions. Finally, the ability of proposed graphene surface modification route was further proofed by using surface methods, i.e. SEM and EDXA, and contact angles measurements.

Performance of coatings containing treated silica fume in the corrosion protection of reinforced concrete

2018 ◽  
Vol 47 (4) ◽  
pp. 350-359 ◽  
Author(s):  
Nivin M. Ahmed ◽  
Mostafa G. Mohamed ◽  
Reham H. Tammam ◽  
Mohamed R. Mabrouk
Keyword(s):  
Reinforced Concrete ◽  
Silica Fume ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Dual Function ◽  
Core Shell ◽  
Protection Efficiency ◽  
Content Type ◽  
Anticorrosive Pigments

Purpose This study aims to apply novel anticorrosive pigments containing silica fume-phosphates (Si-Ph), which were prepared using core-shell technique by covering 80-90 per cent silica fume (core) with 10-20 per cent phosphates (shell) previously, to play dual functions simultaneously as anticorrosive pigments in coating formulations and as an anticorrosive admixture in concrete even if it is not present in the concrete itself. Two comparisons were held out to show the results of coatings on rebars containing core-shell pigments in concrete, and concrete admixtured with silica fume can perform a dual function as anticorrosive pigment and concrete admixture. The evaluation of corrosion protection efficiency of coatings containing core-shell pigments and those containing phosphates was performed. Design/methodology/approach Simple chemical techniques were used to prepare core-shell pigments, and their characterization was carried out in a previous work. These pigments were incorporated in solvent-based paint formulations based on epoxy resin. Different electrochemical techniques such as open-circuit potential and electrochemical impedance spectroscopy were used to evaluate the anticorrosive efficiency of the new pigments. Findings The electrochemical measurements showed that concrete containing coated rebars with core-shell pigments exhibited almost similar results to that of concrete admixtured with silica fume. Also, the anticorrosive performance of coatings containing Si-Ph pigments offered protection efficiency almost similar to that of phosphates, proving that these new pigments can perform both roles as anticorrosive pigment and concrete admixture. Originality/value Although the new Si-Ph pigments contain more than 80 per cent waste material, its performance can be compared to original phosphate pigments in the reinforced concrete.

scholarly journals Fabrication and evaluation of Rb2Co(H2P2O7)2·2H2O/waterborne polyurethane nanocomposite coating for corrosion protection aspects

RSC Advances ◽  
2017 ◽  
Vol 7 (87) ◽  
pp. 55074-55080 ◽  
Author(s):  
M. A. Deyab ◽  
R. Essehli ◽  
B. El Bali ◽  
M. Lachkar
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Waterborne Polyurethane ◽  
Nanocomposite Coating ◽  
Nacl Solution ◽  
Protection Efficiency

Here we investigate the influence of new acidic pyrophosphate (Rb2Co(H2P2O7)2·2H2O) (DP) incorporation in waterborne polyurethane (WBPU) coatings on the corrosion protection efficiency of WBPU coatings for carbon steel in 3.5% NaCl solution.

Study of the corrosion protection efficiency of polypyrrole/metal oxide nanocomposites as additives in anticorrosion coating

2020 ◽  
Vol 67 (3) ◽  
pp. 305-312 ◽  
Author(s):  
R. Rajkumar ◽  
C. Vedhi
Keyword(s):  
Metal Oxide ◽  
Mild Steel ◽  
Corrosion Protection ◽  
Metal Oxide Nanoparticles ◽  
Acrylic Resin ◽  
Polymerization Process ◽  
Oxide Nanoparticles ◽  
Protection Efficiency ◽  
Content Type ◽  
Resin Coating

Purpose Polypyrrole (PPy) and PPy/metal oxide nanocomposites were synthesized by oxidative polymerization process, and its corrosion protection ability was studied by immersion test and electrochemical corrosion studies in 1 per cent HCl and 3.5 per cent NaCl solution. Design/methodology/approach The prepared composites were loaded in acrylic resin and subsequently coated on a mild steel surface. The characterization of the polymer composites using FT-IR, UV-vis, XRD and FE-SEM with EDS analysis confirmed the interaction between PPy and metal oxide nanoparticles. The PPy nanoparticles were less protected on the mild steel, but the nanocomposite coating with metal oxide nanoparticles dramatically increased the corrosion resistance. Findings According to the corrosion protection ability of the coating, it was demonstrated that the acrylic resin coating composed of PPy/metal oxide nanocomposites was highly efficient in protecting the mild steel compared to the PPy nanoparticles. The highest protection efficiency was obtained by PPy/TiO2 nanocomposites with acrylic resin coating. Originality/value To the best of the authors’ knowledge, this paper consists of original, unpublished work which is not under consideration for publication elsewhere and that all the co-authors have approved the contents of this manuscript and submission.

scholarly journals Corrosion Protection of Metallic Waste Packages Using Thermal Sprayed Ceramic Coatings

1999 ◽  
Vol 556 ◽  
Author(s):  
K. R. Wilfinger ◽  
J. C. Farmer ◽  
R. W. Hopper ◽  
T. E. Shell
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Ceramic Coating ◽  
Porous Ceramic ◽  
Ceramic Coatings ◽  
Experimental Results ◽  
Metal Interface ◽  
Electrical Measurements ◽  
Corrosion Rates ◽  
Coated Carbon

AbstractCeramic coated carbon steel coupons were corrosion tested in water with dissolved salts to simulate exposure to evaporation concentrated groundwater in an underground nuclear repository. Metallography revealed no corrosion at the ceramic metal interface of dense coatings, even though electrical measurements demonstrated that the coatings were slightly porous. Experimental results and a model to predict corrosion rates influenced by a porous ceramic coating and coating lifetimes are presented.

Corrosion Protection Efficiency of Bilayer Porphyrin-Polyaniline Film Deposited on Carbon Steel

2015 ◽  
Vol 352 (1) ◽  
pp. 16-24 ◽  
Author(s):  
Iuliana Popa ◽  
Eugenia Fagadar-Cosma ◽  
Bogdan-Ovidiu Taranu ◽  
Mihaela Birdeanu ◽  
Gheorghe Fagadar-Cosma ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Protection Efficiency ◽  
Polyaniline Film

scholarly journals Corrosion Protection Study of Carbon Steel and 316 Stainless Steel Alloys Coated by Nanoparticles

2014 ◽  
Vol 11 (1) ◽  
pp. 116-122
Author(s):  
Baghdad Science Journal
Keyword(s):  
Stainless Steel ◽  
Zinc Oxide ◽  
Carbon Steel ◽  
Atomic Force Microscope ◽  
Corrosion Protection ◽  
Saline Water ◽  
Steel Alloys ◽  
Protection Efficiency ◽  
316 Stainless Steel ◽  
Atomic Force

The Corrosion protection effectiveness of Alimina(Al2O3,50nm)and Zinc oxide (ZnO,30nm) nanoparticales were studied on carbon steel and 316 stainless steel alloys in saline water (3.5%NaCl)at four temperatures: (20,30,40,50 OC)using three electrodes potentiostat. An average corrosion protection efficiencies of 65 %and 80% was achieved using Al2O3 NP's on carbon steel and stainless steel samples respectively, and it seems that no effect of rising temperature on the performances of the coated layers. While ZnO NP'S showed protection efficiency around 65% for the two alloys and little effected by temperature rising on the performanes of the coated layers. The morphology of the coated spesiemses was examined by Atomic force microscope.

Structural, electrochemical and mechanical studies of ultrasonic irradiation enhanced electroplating Ni coating

2018 ◽  
Vol 65 (4) ◽  
pp. 333-339 ◽  
Author(s):  
Chaolei Ban ◽  
Shuqin Zhu ◽  
Jie Ma ◽  
Fangreng Wang ◽  
Zhengfeng Jia ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Ultrasonic Irradiation ◽  
Design Methodology ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
X Ray Diffraction ◽  
Content Type ◽  
X Ray ◽  
Mechanical Studies

Purpose Ni coating was electroplated on carbon steel substrate to protect carbon steel. Design/methodology/approach During electroplating, the ultrasonic irradiation (UI) (1 kHz) action was in situ used with different frequency. The influence of UI on the microstructure, mechanical and electrochemical performance of the coating was studied with scanning electron microscopy, X-ray diffraction, microhardness measurement, polarization curves and electrochemical impedance spectroscopy. Findings The results show that comparing that without UI imposition, UI during electroplating can refine the coating grain and decrease the micro-pores in the coating, resulting in improvement of the coating corrosion and hardness. Originality/value The imposition of UI action during electroplating Ni coating can remove intrinsic pores in the coating and compact the coating. The potential bimetallic cell between substrate and plating layer can be insulated to enhance the corrosion resistance of Ni coating. The imposition of UI action during electroplating Ni coating can refine Ni coating grain size and improve the coating haredness.

Corrosion protection of some Cu-based alloys by polyacrylate-alumina nanocomposite coatings

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Adel Attia ◽  
Lobna Khorshed ◽  
Samir Morsi ◽  
Elsayed Ashour
Keyword(s):  
Corrosion Protection ◽  
Design Methodology ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Nanocomposite Coating ◽  
Open Circuit ◽  
Protection Efficiency ◽  
Content Type ◽  
Polyacrylic Polymer

Purpose The purpose of this study was to investigate the polyacrylic polymer/Al2O3 as a new nanocomposite coating to protect brass and Al-bronze in 3.5% NaCl and the role of alumina formulation on their protection efficiency Design/methodology/approach The corrosion efficiency of the nanocomposite coating (NCC) was evaluated by open circuit potential and electrochemical impedance spectroscopy (EIS). Findings The protection efficiency was more in the case of Al-bronze even for the same formulation of alumina NCC indicated the Cu substrate contribution. The Cu oxides in alloys and Al2O3 from the NCC and Al-bronze were responsible for this protection. Originality/value All the techniques supported each other, the presence of alumina was responsible for the corrosion protection efficiency.

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