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.

scholarly journals THE ROLE OF COUNTER ANIONS IN ANTICORROSIVE PROPERTIES OF SILICA-POLYPYRROLE COMPOSITE

2018 ◽  
Vol 56 (3B) ◽  
pp. 104
Author(s):  
Hải Vân Thị Vũ Thị Hải Vân
Keyword(s):  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Protection Efficiency ◽  
Tafel Polarization ◽  
Point Electrode ◽  
Polypyrrole Composite ◽  
Steel Substrates ◽  
Properties Of Composites

Silica/Polypyrrole (SiO2/PPy) composites were synthesized in the presence of different counter anions as oxalate (Ox), benzoat (Bz) and dodecyl-sulfate (DoS). The morphology and properties of composites were characterized by FTIR, EDX, SEM, TGA and CV method through the two-point-electrode. The synthesized composites were loaded in polyvinylbutyral (PVB) to develop coating for mild steel substrates. A comparative study of the corrosion protection efficiency of carbon steel coated with PVB and PVB containing composites was evaluated by measurement of open circuit potential (OCP), Tafel polarization and electrochemical impedance spectroscopy (EIS). It was found that SiO2/PPyOx could provide much better protection, with the lowest current density (4.81×10-8 A.cm-2 and highest impedance modulus (6.25×10-8 Ω.cm-2) when compared with SiO2/PPyDoS and SiO2/PPyBz due to the small size and inhibitive ability of oxalate anion.

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.

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.

Evaluation of biocorrosion on stainless steels using laboratory-reared barnacle Amphibalanus amphitrite

2014 ◽  
Vol 61 (6) ◽  
pp. 402-408 ◽  
Author(s):  
Luciana V.R. de Messano ◽  
Leila Y. Reznik ◽  
Lucio Sathler ◽  
Ricardo Coutinho
Keyword(s):  
Stainless Steels ◽  
Design Methodology ◽  
Open Circuit Potential ◽  
Corrosion Behaviour ◽  
Skeletonema Costatum ◽  
Open Circuit ◽  
Breakdown Potential ◽  
Content Type ◽  
Polarisation Resistance ◽  
And Control

Purpose – The purpose of this paper was to use the barnacle Amphibalanus amphitrite reared in the laboratory to investigate the effects of juveniles on corrosion behaviour of three stainless steels (SS): UNS S31600, N08904 and UNS S32760. Design/methodology/approach – Barnacle larvae were maintained in a laboratory until they reached the cypris larval stage. A total of 100 cyprids were added to four individual containers; each SS coupon (70 × 50 × 2 mm3) was immersed into the containers. After the cyprids attached to the coupons, juveniles were reared for 21 days with the microalgae Skeletonema costatum (Greville) Cleve. Values of open circuit potential (OCP), breakdown potential (Eb) and polarisation resistance (Rp) were evaluated, along with surface examinations. Findings – OCP differences between barnacles and control coupons were not apparent. However, the lowest values of Eb and Rp were observed in the presence of juvenile barnacles, demonstrating the SS corrosion caused by these organisms. Crevice corrosion around the base of the barnacles was detected during visual inspections, despite the small size of the barnacles and the short duration of the experiments. Originality/value – The A. amphitrite assays were useful as a tool for testing corrosion behaviour of the SS under laboratory conditions. This was the first study to test the use of this common protocol in anti-fouling research as a method to study marine biocorrosion.

Poly(2-chloroaniline) and poly(aniline-co-2-chloroaniline) films on ZnFe alloy plating

2018 ◽  
Vol 65 (6) ◽  
pp. 580-586 ◽  
Author(s):  
Abdurrahman Akdag ◽  
Gul Ozyilmaz ◽  
Ali Tuncay Ozyilmaz
Keyword(s):  
Electrochemical Impedance ◽  
Alloy Coating ◽  
Open Circuit ◽  
Constant Current ◽  
Sodium Oxalate ◽  
Protection Efficiency ◽  
Content Type ◽  
Alloy Plating ◽  
Alternative Current

Purpose The purpose of this paper is to evaluate and compare the protective, anticorrosion behaviors and electrochemically synthesis of poly(2-chloroaniline) (PCANI) and poly(2-chloroaniline-co-aniline) P(CANI-co-ANI) films on thin zinc–iron plated carbon steel (CS). Design/methodology/approach Zinc–iron (ZnFe) alloy plating was successfully achieved on CS applying 3 mA constant current value. The PCANI and P(CANI-co-ANI) films on ZnFe-plated CS electrode were synthesized by cyclic voltammetry technique using monomer(s) containing 0.20 M sodium oxalate solution. The CS/ZnFe electrodes with and without PCANI or P(CANI-co-ANI) films were characterized using SEM and anodic linear sweep voltammograms. The anticorrosive behaviors of uncoated and coated electrodes were studied in 3.5 per cent NaCl solution by corrosion techniques which include open circuit potential measurements, the anodic polarization curves and alternative current electrochemical impedance spectroscopy (EIS) technique. Findings The protection efficiency values (E per cent) for CS/ZnFe, ZnCS/ZnFe/PCANI and CS/ZnFe/P(CANI-co-ANI) electrodes were calculated as 71.05, 84.53 and 92.79, respectively, after 168 h of immersion time. The results showed that P(CANI-co-ANI) coating on ZnFe-plated CS electrode exhibited higher corrosion resistance and provided better barrier property in comparison with PCANI coating and ZnFe alloy plating, in longer exposure time. Originality/value A number of reports on the synthesis and characterization of PANI have appeared in the literature during the past decade, but there is no such publication of PCANI. At the same time, the synthesis of PCANI onto the surface of metal alloy coating being the first of this kind, no such proceedings have been reported in the literature so far.

Corrosion protection performance of reinforced steel coated with paints based on waste materials

2018 ◽  
Vol 65 (4) ◽  
pp. 368-374 ◽  
Author(s):  
Mostafa G. Mohamed ◽  
Nivin M. Ahmed ◽  
Walaa M. Abd El-Gawad
Keyword(s):  
Corrosion Protection ◽  
Design Methodology ◽  
Silica Content ◽  
Organic Coatings ◽  
Waste Materials ◽  
Content Type ◽  
Metal Structures ◽  
Reinforced Steel ◽  
Novel Method

PurposeUsing organic coatings serves as a key method to protect metal structures against corrosion. Attempts have been made to improve the corrosion inhibition of the coatings using novel types of pigments. This study aims to study the application of organic coatings containing rice straw (RS) waste as anticorrosive pigment for corrosion protection of reinforced steel. The RS was used by precipitating a thin layer of ferrite pigments on its surface to improve their characteristics and corrosion resistance activity.Design/methodology/approachThe evaluation of corrosion behavior of coated reinforced steel with paints containing these novel pigments is reported using different electrochemical methods.FindingsThe coatings containing the new prepared RS-ferrite pigments offered good corrosion protection, and coatings containing RS-ZnFe showed the best protection performance.Originality/valueThis paper introduces novel method to prepare treated RS without any burning and to play the role of pigments in anticorrosive paint formulations based on its silica content.

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.

Electrosynthesis of a Duplex Coating Consisting of a Cerium-Based Layer and a Polypyrrole Film for the Corrosion Protection of AISI 304 Stainless Steel

2021 ◽  
Vol 8 ◽  
pp. 1-11
Author(s):  
A.P. Loperena ◽  
I.L. Lehr ◽  
S.B. Saidman
Keyword(s):  
Stainless Steel ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Protection Efficiency ◽  
Duplex Coating ◽  
Polypyrrole Film

Duplex coating consisting of an inner cerium-based layer and polypyrrole (PPy) film topcoat was electrodeposited onto AISI 304 stainless steel. The cerium-based coating was electrodeposited in solutions containing cerium nitrate at 50 ºC. The polymeric outer layer was electropolymerized in the presence of sodium bis(2-ethylhexyl) sulfosuccinate (AOT). The electrosynthesis was done under potentiostat conditions. The coatings were characterized by scanning electron microscopy (SEM) and energy dispersive x-ray spectrometry (EDX). The morphology of the double-layered cerium polypyrrole film shows a granular structure with the presence of agglomerates of small grains. The anticorrosive performance of the coatings was evaluated in sodium chloride solution by linear polarization, open circuit measurements, and electrochemical impedance spectroscopy (EIS). Single films, cerium layer and PPy coating, and the duplex film all reduce the corrosion rate of AISI 304 stainless steel in NaCl solution. The duplex coating presents an improved corrosion resistance concerning the single films. The combination of the characteristics of the single layers is responsible for the superior corrosion protection efficiency of the double-layered cerium polypyrrole coating.

Polyaniline based red oxide primer paint for efficient corrosion protection

2014 ◽  
Vol 61 (6) ◽  
pp. 409-415 ◽  
Author(s):  
V. Rajasekharan ◽  
P. Manisankar
Keyword(s):  
Corrosion Protection ◽  
Zinc Phosphate ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Original Research ◽  
Coating Technology ◽  
Content Type ◽  
Corrosion Studies ◽  
Anticorrosive Pigments ◽  
Better Than

Purpose – The purpose of this study is to introduce mechanochemically prepared polyaniline anticorrosive additives. In primer coating technology, there is an increasing interest in the development of efficient anticorrosive additives which replace the conventional inorganic anticorrosive pigments like heavy metal chromates and phosphates normally added to primer paints for the coating on metals. Conducting polymers are found to be better alternatives. Design/methodology/approach – Polyaniline phosphate is synthesized through solid-state conditions without using any solvent. The synthesized polyaniline phosphate is added in the primer formulation instead of zinc phosphate. Primers with different quantity of zinc phosphate are also formulated and studied for comparison. The comparison between their abilities to control corrosion of carbon steel were done with application of open-circuit potential monitoring, polarization and electrochemical impedance spectroscopy methods in 3.5 per cent NaCl solution. Findings – Corrosion studies indicate that polyaniline phosphate can improve corrosion protection properties by taking part the passivation processes. The performance of polyaniline phosphate is better than zinc phosphate. Originality/value – I certify that the results are from our original research and this paper is neither considered for publication elsewhere nor published previously.

Corrosion protection of coatings doped with inhibitor-loaded nanocapsules

2015 ◽  
Vol 62 (2) ◽  
pp. 88-94 ◽  
Author(s):  
Ahmad Khajouei ◽  
Effat Jamalizadeh ◽  
Seyed Mohammad Ali Hosseini
Keyword(s):  
Epoxy Resin ◽  
Corrosion Protection ◽  
Cationic Surfactants ◽  
Design Methodology ◽  
Electrochemical Impedance ◽  
Halloysite Nanotubes ◽  
Corrosion Activity ◽  
Protective Properties ◽  
Content Type ◽  
Eis Measurements

Purpose – The purpose of this paper was to study the corrosion resistance of AA2024 alloy using surfactant-modified halloysite nanocapsules capable of holding benzotriazole (BTA) as the corrosion inhibitor and discharging it into the solution. Design/methodology/approach – The effect of surfactant shells was studied by surfactant-modified halloysite nanotubes fabricated through assembly of two types of cationic surfactants. The zeta potential and size distribution measurements were performed using a Zetasizer Nano. The concentration of BTA during release into the solution was detected by using a UV–vis spectrophotometer. The anti-corrosion activity of nanocapsules as free agents with respect to the AA2024 alloy was investigated using the potentiodynamic scan (PDS) method. An epoxy resin doped with nanocapsules was used as an anti-corrosion coating deposited on the AA2024 alloy. The corrosion protection performance of coatings was studied by using the electrochemical impedance spectroscopy (EIS) method. Findings – The results indicate that the release of the inhibitor from nanocapsules depends on the surfactant shell components. The PDS results confirmed the feasibility of developing “smart” corrosion protection by inhibitor-loaded nanocapsules. The results of EIS measurements showed that the coating with the nanocapsules exhibited enhanced corrosion protection in comparison with the undoped coating. Originality/value – The findings of this paper indicate that surfactant-modified halloysite nanocapsules can be added to epoxy resin coatings to improve their corrosion protective properties for the AA2024 alloy.

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