scholarly journals Protection of Mild Steel by Waterborne Epoxy Coatings Incorporation of Polypyrrole Nanowires/Graphene Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1998 ◽  
Author(s):  
Yang Ding ◽  
Jiang Zhong ◽  
Ping Xie ◽  
Jinchuang Rong ◽  
Huifang Zhu ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
In Situ Polymerization ◽  
Barrier Properties ◽  
Nanocomposite Coating ◽  
Open Circuit ◽  
Epoxy Coatings ◽  
Graphene Nanocomposites ◽  
Polypyrrole Nanowires ◽  
Waterborne Epoxy

Polypyrrole nanowires/graphene (PPyNG) nanocomposites as anticorrosive fillers were prepared by in situ polymerization in order to improve the anticorrosion performance of waterborne epoxy coatings. Field emission scanning electron microscope (FESEM) and Fourier transform infrared spectroscopy (FTIR) characterized the morphologies and structures of the synthesized PPyNG. The polypyrrole nanowires with about 50 nm in diameter were obtained. Conjugation length of PPy was increased with the addition of graphene. Open circuit potential (OCP) measurements, Tafel polarization curves, and electrochemical impedance spectroscopy (EIS) using an electrochemical workstation evaluated the anticorrosion properties of the waterborne epoxy/PPyNG coatings (EPPyNG). The studied nanocomposite coating possessed superior corrosion protection performance when the graphene content of the filler was 2 wt %. Its corrosion rate was about 100 times lower than that of neat epoxy coating. The higher barrier properties of nanocomposite coating and passivation effect of polypyrrole nanowires were beneficial in corrosion protection.

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.

Electrochemical Impedance Spectroscopy Behaviour of NdFeB Coated Magnets in Saliva Solution for Orthodontic Applications

2015 ◽  
Vol 227 ◽  
pp. 515-518 ◽  
Author(s):  
Luigi Calabrese ◽  
Lucio Bonaccorsi ◽  
Chiara Borsellino ◽  
Angela Caprì ◽  
Francesca Fabiano ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Protective Action ◽  
Barrier Properties ◽  
Dip Coating ◽  
Coating Technique ◽  
Number Of Layers ◽  
Dip Coating Technique

In this work the assessment of the corrosion performances in saliva solution of NdFeB magnets coated with silane layers was studied for its application in orthodontic brackets. The silane film, deposited by dip coating technique, has been prepared with varying dipping steps, with the purpose to identify the number of layers able to achieve an optimal protective action. Corrosion protection performance, during immersion in Fusayama synthetic saliva solution, was evaluated by means electrochemical impedance spectroscopy (EIS). The silane coatings evidenced good barrier properties resulting in an improvement of the anti-corrosion performances of the magnets. Better results were observed for samples with at least 15 layers of silane, that evidenced still acceptable protective action after three days of immersion in a Fusayama synthetic saliva solution.

scholarly journals Corrosion Protection of A36 Steel with SnO2 Nanoparticles Integrated into SiO2 Coatings

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 385 ◽  
Author(s):  
Ana Karen Acero-Gutiérrez ◽  
Ana Lilia Pérez-Flores ◽  
Jesús Gilberto Godínez-Salcedo ◽  
Joel Moreno-Palmerin ◽  
Ángel de Jesús Morales-Ramírez
Keyword(s):  
Corrosion Protection ◽  
Corrosion Inhibition ◽  
Silicon Oxide ◽  
Electrochemical Impedance ◽  
Sno2 Nanoparticles ◽  
Sol Gel ◽  
Barrier Properties ◽  
Dip Coating ◽  
Uncoated Sample ◽  
A36 Steel

Tin oxide (SnO2) nanoparticles were successfully added to silicon oxide (SiO2) coatings deposited on A36 steel by the sol-gel and dip-coating methods. These coatings were developed to improve the performance of corrosion protection of steel in a 3 wt % NaCl solution. The effects of modifying the SnO2 particle concentration from 0–7.5 vol % were investigated by polarization resistance, Tafel linear polarization, and electrochemical impedance spectroscopy (EIS). The formation of protective barriers and their corrosion inhibition abilities were demonstrated. It was found by electrochemical studies that all of the coated samples presented higher corrosion resistances compared with an uncoated sample, indicating a generally beneficial effect from the incorporation of the nanoparticles. Furthermore, it was established that the relationship between the SnO2 content and the corrosion inhibition had parabolic behaviour, with an optimum SnO2 concentration of 2.5 vol %. EIS showed that the modified coatings improved barrier properties. The resistance for all of the samples was increased compared with the bare steel. The corrosion rate measurements highlighted the corrosion inhibition effect of SnO2 nanoparticles, and the Tafel polarization curves demonstrated a decrease in system dissolution reactions at the optimal nanoparticle concentration.

scholarly journals Graphene Oxide/Polyaniline Nanocomposites Used in Anticorrosive Coatings for Environmental Protection

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1215
Author(s):  
Shuanqiang Yang ◽  
Shu Zhu ◽  
Ruoyu Hong
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Impedance ◽  
In Situ Polymerization ◽  
Barrier Properties ◽  
Living Environment ◽  
Metal Corrosion ◽  
Corrosion Performance ◽  
Corrosion Properties ◽  
Anticorrosive Coatings ◽  
Vis Spectroscopy

In recent years, metal corrosion causes serious threats to the economy of the world and the living environment. Hence, it is very important to seek non-toxic and environmentally friendly materials with metal anti-corrosion properties for the sustainable development of society. The barrier properties of graphene oxide (GO) and the special electrochemical property of polyaniline (PANI) can significantly improve the corrosion resistance of metals. Herein, we developed an in-situ polymerization method to prepare graphene oxide/polyaniline (GO/PANI) nanocomposites with unique anti-corrosion properties. The obtained GO/PANI nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermalgravimetric analysis, UV–vis spectroscopy and scanning electron microscopy. The as-prepared composite materials were uniformly dispersed in epoxy resin to prepare anticorrosive coatings and coated on the surface of steel. The anti-corrosion performance of the coatings was measured by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization technique. The EIS results showed that the total impedance of epoxy/GO/PANI coatings is greater than epoxy/PANII coatings, and the impedance module value can reach 8.67 × 108 Ω·cm2. In general, it is concluded that the anti-corrosion performance of GO/PANI coating is significantly higher than PANI coating and pure GO coating.

Conducting polyaniline/multi-wall carbon nanotubes composite paints on low carbon steel for corrosion protection: electrochemical investigations

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Pravin Deshpande ◽  
Sanket Vathare ◽  
Shashikant Vagge ◽  
Elena Tomšík ◽  
Jaroslav Stejskal
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Steel ◽  
Corrosion Protection ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Low Carbon Steel ◽  
Open Circuit ◽  
Low Carbon ◽  
Multi Wall Carbon Nanotubes ◽  
Poly Aniline

AbstractThe coaxial coating of multi-wall carbon nanotubes (MWCNT) with poly(aniline) (PANI) was synthesised and a paint was prepared containing conducting PANI-MWCNT composite. The corrosion protection performance was assessed by open circuit potential measurements, potentiodynamic polarisation, and electrochemical impedance spectroscopy. The corrosion rate of low-carbon steel coated with 1.5 mass % of PANI-MWCNT-based paint in 3.5 mass % sodium chloride solution was found to be 0.037 mm y−1, about 5.2 times lower than that of unpainted low-carbon steel and 3.6 times lower than that of epoxy painted steel.

scholarly journals Evaluation of the anticorrosion of waterborne epoxy coatings containing cerium salt-activated ceria nanoparticles deposited onto carbon steel substrates

2018 ◽  
Vol 56 (3B) ◽  
pp. 96
Author(s):  
Anh Son Nguyen ◽  
Thuy Duong Nguyen ◽  
Thu Thuy Thai
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Salt Spray ◽  
Ceo2 Nanoparticles ◽  
Ceria Nanoparticles ◽  
Epoxy Coatings ◽  
Artificial Defect ◽  
Waterborne Epoxy ◽  
Cerium Salt ◽  
Steel Substrates

The presence work investigates the corrosion protection of waterborne epoxy coatings containing CeO2 nanoparticles activated with cerium salt for the carbon steel substrates. First, the dispersion of activated nanoparticles in the epoxy matrix was observed by field emission scanning electron microscopy (FESEM). The electrochemical impedance spectroscopy (EIS) was carried out to evaluate the role of the activated-CeO2 nanoparticles in the organic coatings immersed in a 0.5 M NaCl solution. Thus, the effect of the cerium ion activated ceria nanoparticles on the coatings presented the artificial defect in the aggressive environment was examined via salt spray test. Complementary studies were performed using the cross-cut and pull-off test to assess the adherence properties of the samples. Results revealed that the presence of activated-CeO2 nanoparticles enhanced corrosion protection properties of waterborne epoxy coating without losing adherence properties.

Corrosion Protective Coatings: Fabrication of Sputtered CeO2-La2O3 and La2O3-CeO2 Bilayers

2019 ◽  
Author(s):  
Domínguez-Crespo Miguel Antonio ◽  
Brachetti-Sibaja Silvia ◽  
Torres-Huerta Aidé ◽  
Onofre Edgar ◽  
López-Oyama Ana ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Protective Coatings ◽  
Barrier Properties ◽  
Average Roughness ◽  
Protection Efficiency ◽  
Substrate Composition ◽  
Deposition Parameters ◽  
Potentiodynamic Curves ◽  
The Relationship

This entry provides a comparative study on the corrosion protection efficiency of Ce, La films as well as Ce/La- and La/Ce-bilayered coatings deposited onto AA7075 and AA6061 substrates by the radio frequency magnetron sputtering technique. The coating thickness ranged from ~12 to 835 nm, which changed with the deposition parameters and substrate composition. The relationship between microstructure, roughness, and electrochemical performance is examined. The reactivity and crystallinity of rare earth (RE) films can be tailored by adjusting the sputtering parameters. Sputtered La films with a thickness of ~390 nm and an average roughness of 66 nm showed the best corrosion protection properties in chloride medium as determined by potentiodynamic curves and electrochemical impedance spectroscopy. The method to obtain RE-bilayered coatings, i.e., La/Ce or Ce/La as well as the substrate composition and applied power, conditioned their inhibition properties. The RE-bilayered coatings displayed better barrier properties than Ce films, which were worser than those featured by La films.

Microcapsule/silica dual-fillers for self-healing, self-reporting and corrosion protection properties of waterborne epoxy coatings

2021 ◽  
Vol 159 ◽  
pp. 106394
Author(s):  
Zhenglin Tao ◽  
Jincan Cui ◽  
Hanxun Qiu ◽  
Junhe Yang ◽  
Shanglin Gao ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Self Healing ◽  
Epoxy Coatings ◽  
Waterborne Epoxy

Corrosion protection performance of waterborne epoxy coatings containing self-doped polyaniline nanofiber

2017 ◽  
Vol 407 ◽  
pp. 213-222 ◽  
Author(s):  
Shihui Qiu ◽  
Cheng Chen ◽  
Mingjun Cui ◽  
Wei Li ◽  
Haichao Zhao ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Epoxy Coatings ◽  
Waterborne Epoxy ◽  
Doped Polyaniline ◽  
Polyaniline Nanofiber
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