scholarly journals The Influence of Carbon Nanotubes on the Protective Properties of Polypyrrole Formed at Copper

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2587
Author(s):  
Ursula Carragher ◽  
David Branagan ◽  
Carmel B. Breslin
Keyword(s):  
Carbon Nanotubes ◽  
Corrosion Protection ◽  
Polymer Films ◽  
Charged Surface ◽  
Protective Properties ◽  
Polypyrrole Films ◽  
Dodecylbenzene Sulfonate ◽  
Polypyrrole Film ◽  
Anionic Micelles

Protective polypyrrole films doped with dodecylbenzene sulfonate (DBS) were formed at copper, while carbon nanotubes (CNT) were incorporated within the polymer films with the DBS to give PPy-DBSCNT (polypyrrole films doped with DBS and incorporated CNT). The polymer films were deposited from a 0.05 M DBS solution at a pH of 6.0 at a thin polypyrrole film doped with tartrate, which served as a stable pre-layer. Low corrosion currents of 0.12 and 0.05 μA cm−2 were estimated using Tafel analysis for the PPy-DBS and PPy-DBSCNT films, respectively, while a significant reduction in the concentration of Cu2+ ions from the corroding copper was observed for the polymer-modified copper. The corrosion protection properties were attributed to the doping of the polymer by the large and immobile DBS anions and possibly, by the larger anionic micelles that are formed at a DBS concentration of 9.8 mM in the pyrrole-containing solution. These dopants give a negatively charged surface that repels chloride anions. The additional protective properties afforded by the CNTs appear to be related to the morphology of the CNT-modified polypyrrole coatings, while the functionalized CNTs also provide a negatively charged surface.

scholarly journals CORROSION PROTECTION OF STEEL 1020 BY FILMS OF CONDUCTORS ELETRODEPOSITATED IN METHANOSULFONIC ACID

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
ALEX FERNANDES DE SOUZA ◽  
ANDREA SANTOS LIU ◽  
LIU YAO CHO
Keyword(s):  
Corrosion Protection ◽  
Methanesulfonic Acid ◽  
Industrial Sector ◽  
Surface Coatings ◽  
Chloride Medium ◽  
Reactive Metal ◽  
Polyaniline Film ◽  
Polypyrrole Films ◽  
Polypyrrole Film ◽  
Steel 1020

1020 steel is widely used in the industrial sector, however it is a reactive metal and susceptible to corrosion, being necessary to use surface coatings to corrosion protect the metal in corrosive means. The polyaniline and polypyrrole are conductive polymers that have the ability to inhibit corrosion when deposited electrode in organic media. In this work, corrosion protection was investigated through polyaniline and polypyrrole films electrodeposited in methanesulfonic acid medium. The films were electrodeposited by chronoamperometry and the corrosion tests were performed by potentiodynamic polarization in aggressive sodium chloride medium. The surface of the films was analyzed by scanning electron microscopy. From the polarization it was observed that the polypyrrole film, in relation to the polyaniline film, showed better performance against corrosion. The MEV indicated that the polypyrrole film is homogeneous and adherent, while the polyaniline film showed flaws, allowing the interaction of the metal with the corrosive medium

scholarly journals Self-healing Ability of Epoxy Vitrimer Nanocomposites Containing Bio-Based Curing Agents and Carbon Nanotubes for Corrosion Protection

2021 ◽  
Author(s):  
Narubeth Lorwanishpaisarn ◽  
Natwat Srikhao ◽  
Kaewta Jetsrisuparb ◽  
Jesper T. N. Knijnenburg ◽  
Somnuk Theerakulpisut ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Corrosion Protection ◽  
Self Healing ◽  
Curing Agents

Study on Morphologies of Palladium Coated Foam Nickel Cathodes for Dechlorination of 2,4-Dichlorophenol

2012 ◽  
Vol 571 ◽  
pp. 97-101 ◽  
Author(s):  
Jun Jing Li ◽  
Hui Ling Liu ◽  
Zhi Wei Wang ◽  
Xiu Wen Cheng
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Composite Electrode ◽  
Potential Temperature ◽  
Nickel Electrode ◽  
Polymerization Time ◽  
Applied Potential ◽  
Polypyrrole Films ◽  
Polypyrrole Film ◽  
Scanning Electron

Electrolytically deposited palladium on polypyrrole film, which is electropolymerized using potentiostatic method, covered foam nickel electrode as a support was used as cathode for the electrocatalytic hydrodechlorination of 2, 4-dichlorophenol in aqueous solution. It is well known that the morphologies of polypyrrole films have dramatic influences on the dispersion of metals and the performance of the composite electrode. The influence of applied potential, temperature and polymerization time on the morphology of the films was studied by scanning electron microscopy (SEM). The fundamental electrocatalytic hydrodechlorination (ECH) results indicated that the electrocatalytic activity of Pd loaded polypyrrole foam nickel electrode is excellent for dechlorination of 2,4-dichlorophenol. The present study shows a promising choice of this kind of composite electrode for ECH.

Corrosion Resistance of Nd-Fe-B Magnets Coated with Polypyrrole Films

2006 ◽  
Vol 530-531 ◽  
pp. 111-116
Author(s):  
M.C.E. Bandeira ◽  
F.D. Prochnow ◽  
Isolda Costa ◽  
César V. Franco
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Low Frequencies ◽  
Polypyrrole Films ◽  
Phosphate Ions ◽  
Polypyrrole Film ◽  
Corrosive Environments ◽  
Magnet Surface

Nd-Fe-B magnets present outstanding magnetic properties. However, due to their low corrosion resistance, their applications are limited to non-corrosive environments. Nowadays, significant efforts are underway to increase the corrosion resistance of these materials, through the use of coatings. Herein are presented the results of a study on the corrosion resistance of Nd-Fe-B magnets coated with polypyrrole (PPY). The electrochemical behavior of coated and uncoated magnets has been studied by Electrochemical Impedance spectroscopy (EIS) in synthetic saliva. The results were compared to previous investigations, which were carried out under similar conditions, in Na2SO4 and NaCl solutions. In sulphate solution, the corrosion resistance of the PPY-coated magnet was 3 times larger (1600 .cm2) than that of uncoated magnet (500 .cm2). In NaCl solution, however, the corrosion resistance of coated and uncoated magnets were very similar (250 .cm2). In synthetic saliva, both the uncoated and coated magnets presented good corrosion performance (1940 .cm2). Such behavior can be attributed to the phosphate ions in saliva, which play a role as corrosion inhibitor, producing phosphating, at least partially, of the magnet surface. The PPY-coated magnets presented a strong diffusional control from moderate to low frequencies, caused by the polypyrrole film. The thicker PPY film increased the corrosion resistance of the magnet in synthetic saliva.

Layer-by-layer assembly of MXene and carbon nanotubes on electrospun polymer films for flexible energy storage

Nanoscale ◽  
2018 ◽  
Vol 10 (13) ◽  
pp. 6005-6013 ◽  
Author(s):  
Zehang Zhou ◽  
Weerapha Panatdasirisuk ◽  
Tyler S. Mathis ◽  
Babak Anasori ◽  
Canhui Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Energy Storage ◽  
Polymer Films ◽  
Layer By Layer ◽  
Polymer Fiber ◽  
Fiber Networks ◽  
Layer By Layer Assembly ◽  
Layer Assembly

Highly flexible and foldable supercapacitor electrodes were fabricated by the layer-by-layer assembly of Ti3C2Tx(MXene) nanoflakes with carbon nanotubes on electrospun polymer fiber networks.

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