Phosphate-doped polyaniline/Al2O3 nanocomposite coating for protection of stainless steel

2020 ◽  
Vol 67 (5) ◽  
pp. 491-499
Author(s):  
Abou-Elhagag A. Hermas ◽  
Mostafa H. Wahdan ◽  
Eatemad M. Ahmed
Keyword(s):  
Stainless Steel ◽  
Chloride Solution ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Nanocomposite Coating ◽  
Phosphate Solution ◽  
Content Type ◽  
Doped Polyaniline ◽  
Microscopy Techniques ◽  
Pani Layer

Purpose This work aims to prepare and characterize of protective anticorrosion phosphate-doped polyaniline (PANI) nanocomposite coatings for stainless steel (SS) in chloride solution. Design/methodology/approach PANI composite coatings were electrodeposited from aqueous sulfuric acid solution containing monomer and Al2O3 nanoparticles using cyclic voltammetry technique. Doping by phosphate was done by aging the coated steels for different periods (1–168 h) in phosphate solution. The polymer film composite was investigated by Fourier-transform infrared spectroscopy and scanning electron microscopy techniques. Potential-time, anodic polarization and electrochemical impedance spectroscopy were used to study the protection efficiency of the coatings. Findings The Al2O3 nanoparticles were incorporated into the deposited PANI layer but they decreased the deposition of polymer. The nanoparticles and the phosphate anions enhanced the protective PANI layer for passivation and protection of SS in the chloride solution. Originality/value The replacement of counter anions by phosphate ions improved significantly the PANI and its nanocomposite as protective coating of SS in chloride solution.

Corrosion inhibition of stainless steel in sulfuric acid solution containing sulfide ions

2019 ◽  
Vol 66 (3) ◽  
pp. 360-368 ◽  
Author(s):  
Abou-Elhagag A. Hermas ◽  
Abobakr Mohamed Elnady ◽  
Reham M. Ali
Keyword(s):  
Stainless Steel ◽  
Corrosion Inhibitors ◽  
Electrochemical Impedance ◽  
Adsorbed Layer ◽  
Content Type ◽  
Positive Side ◽  
Efficiency Increase ◽  
Weight Loss Method ◽  
Loss Method ◽  
Sulfide Ions

Purpose Although stainless steel (SS) has good corrosion resistance in most aqueous solutions, it suffers corrosion in some solutions which contain aggressive ions such as sulfide ions. This study aims to use some cephalosporins (cefotaxime, cephapirin and cefazolin) as corrosion inhibitors of commercial SS in 0.5 M H2SO4 solution containing sulfide ions at 30°C. Design/methodology/approach The study was carried out using weight loss method, potential-time, linear polarization, potentiodynamic polarization, electrochemical impedance measurements, scanning electron microscopy, Fourier transform infrared and energy dispersive X-ray analysis. Findings The presence of the cephalosporin compound in the corrosive medium shifted the corrosion potential of SS to much positive side, which enhances self-passivation of SS, and the shifting increased with increasing inhibitor concentration. The cephalosporin compounds worked as effective inhibitors with mainly anodic and the efficiency increase as cefotaxime < cephapirin < cefazolin. The inhibitors form a protective adsorbed layer, which enriches the surface content of Ni and Cr and thus assists the SS to be passive. Originality/value The antibiotics cephalosporins could be used as effective corrosion inhibitors for SS in acidic solutions containing sulfide ions. The inhibitors enhances the the passive oxide film of SS even in presence of aggressive ions such as sulfide ions.

Surface white spot and pitting corrosion of 316 L stainless steel

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guanghui Yi ◽  
Dajiang Zheng ◽  
Guang-Ling Song
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Electrochemical Impedance ◽  
White Spot ◽  
General Corrosion ◽  
Corrosion Performance ◽  
Content Type ◽  
White Spots ◽  
316 L Stainless Steel

Purpose The purpose of this paper is to address the concern of some stainless steel users. To understand the effect of surface white spots on corrosion performance of stainless steel. Design/methodology/approach White spots appeared on some component surfaces made of 316 L stainless steel in some industrial applications. To address the concern about the pitting performance in the spot areas, the pitting corrosion potential and corrosion resistance were measured in the spot and non-spot areas by means of potentiodynamic polarization and electrochemical impedance spectroscopy and the two different surface characteristics were analytically compared by using optical microscopy, laser confocal microscopy, scanning electron microscopy, x-ray diffraction, energy dispersive spectroscopy and auger energy spectroscopy. The results indicated that the pitting performance of the 316 L stainless steel was not negatively influenced by the spots and the white spots simply resulted from the slightly different surface morphology in the spot areas. Findings The white spots are actually the slightly rougher surface areas with some carbon-containing species. They do not reduce the pitting resistance. Interestingly, the white spot areas even have slightly improved general corrosion resistance. Research limitations/implications Not all surface contamination or roughening can adversely affect the corrosion resistance of stainless steel. Practical implications Stainless steel components with such surface white spots are still qualified products in terms of corrosion performance. Originality/value The surface spot of stainless steel was systematically investigated for the first time for its effect on corrosion resistance and the conclusion was new to the common knowledge.

Microstructure and corrosion resistance of Ni/Cr3C2-NiCr composite coating

2019 ◽  
Vol 66 (4) ◽  
pp. 471-478 ◽  
Author(s):  
Majid Hosseinzadeh ◽  
Abdol Hamid Jafari ◽  
Rouhollah Mousavi ◽  
Mojtaba Esmailzadeh
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Design Methodology ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Content Type ◽  
Bath Solution ◽  
Electrochemical Deposition Method ◽  
Base Composite

Purpose In this study, electrochemical deposition method which have cheaper equipment than thermal spraying methods and is available for the production of composite coatings were used. Design/methodology/approach Composite coatings were electrodeposited from a Watts's bath solution in which the suspended Cr3C2-NiCr particles were dispersed in the bath solution during deposition. Potentiodynamic polarization and electrochemical impedance spectroscopy techniques have been used to evaluate the corrosion resistance of the composite coating in the 3.5 Wt.% NaCl solution. Findings It was found that the submicron Cr3C2-NiCr particles distributed uniformly in the coating and depend on the current density of deposition, different amount of particles can be incorporated in the coating. The results showed that the corrosion resistance of the Ni/ Cr3C2-NiCr composite coatings is more comparable to the pure nickel coating. Originality/value Production of Ni-base composite coating from an electrolytic bath containing Cr3C2-NiCr particles is possible via electrodeposition.

scholarly journals Wettability and Anti-Corrosion Performances of Carbon Nanotube-Silane Composite Coatings

Fibers ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 57
Author(s):  
Luigi Calabrese ◽  
Amani Khaskoussi ◽  
Edoardo Proverbio
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Sol Gel ◽  
Corrosion Current ◽  
Nanocomposite Coating ◽  
Multi Wall Carbon Nanotubes ◽  
Aluminum Corrosion ◽  
Order Of Magnitude ◽  
The Stability

In this paper, a sol-gel N-propyl-trimethoxy-silane coating filled with different amount of multi-wall carbon nanotubes (MWCNTs) was investigated in order to improve the aluminum corrosion resistance. The nanocomposite coating was applied, by drop casting, on AA6061 aluminum alloy substrate. The morphological analysis highlighted that a uniform sol-gel coating was obtained with 0.4 wt.% CNT. Lower or higher nanotube contents lead to the formation of heterogeneities or agglomeration in the coating, respectively. Furthermore, all nanocomposite coatings exhibited effective adhesion to the substrate. In particular, the pull-off strength ranged in 0.82–1.17 MPa. Corrosion protection of the aluminum alloy in NaCl 3.5 wt.% electrolyte (seawater) was significantly improved after CNT addition to the base coating. The stability in electrochemical impedance was observed during three days of immersion in the sodium chloride solution. AS3-CNT2 and AS3-CNT4 batches showed advanced electrochemical stability during immersion tests. Furthermore, interesting results were evidenced in potentiodynamic polarization curves where a decrease of the corrosion current of at least two order of magnitude was observed. Moreover, the breakdown potential was shifted toward noble values. Best results were observed on AS3-CNT6 specimen which exhibited a passivation current density of approximately 1.0 × 10−5 mA/cm2 and a breaking potential of 0.620 V/AgAgClsat.

Role of Mn addition on the general corrosion and pitting corrosion behavior of 13Cr stainless steel

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jun He ◽  
Lin Chen ◽  
Yanjing Su
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Alkaline Solutions ◽  
General Corrosion ◽  
Content Type ◽  
X Ray ◽  
Product Film

Purpose The purpose of this study is to elucidate the effect of Mn addition on the corrosion behavior of stainless steel. Design/methodology/approach Chronoamperometry, quasi-steady-state polarization and electrochemical impedance spectroscopy were used to investigate the corrosion behavior of Mn added A13Cr-HS sample and original S13Cr samples. In addition, the corrosion product film was characterized by a field emission scanning electron microscope equipped with energy-dispersive spectroscopy and X-ray photoelectron spectroscopy. Findings The A13Cr-HS sample with 8 wt.% Mn addition maintained good general corrosion resistance in both acidic and alkaline solutions compared to the original S13Cr sample. Additionally, the A13Cr-HS sample had good pitting resistance in an alkaline solution containing Cl−, but a weaker resistance in an acidic solution. Originality/value The influence of Mn addition on the formation mechanism of the passive film was systematically analyzed.

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.

Deposition of Polyaniline/Silica Nanocomposite Coating on Stainless Steel; Study of its Corrosion Properties

2013 ◽  
Vol 829 ◽  
pp. 605-609 ◽  
Author(s):  
Mohamad Fatahi Amirdehi ◽  
Darush Afzali
Keyword(s):  
Stainless Steel ◽  
Silica Nanoparticles ◽  
Electrochemical Impedance ◽  
Nanocomposite Coating ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
New Developments ◽  
Corrosion Behaviors ◽  
Silica Nanocomposite

In the present century many efforts have been done to develop efficient methods for corrosion protection of steel in various industries. The use of conducting polymers is one of the new developments in the area. In this study, polyaniline/silica nanocomposite has been coated onto 316L stainless steel via in situ method. The corrosion behaviors of the bare and coated steels have been studied in order to reveal influence of silica nanoparticles (70nm).The prepared coating has been characterized using X-ray diffraction (XRD). The corrosion performance of the coating has been investigated in 1 M H2SO4 solution by using electrochemical impedance spectroscopy (EIS). It was found that protecting effect of coated layer is influenced by amounts of silica nanoparticles.

Investigation on 2-mercaptobenzothiazole behavior as corrosion inhibitor for 316-stainless steel in acidic media

2013 ◽  
Vol 61 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Narges Goudarzi ◽  
Hadi Farahani
Keyword(s):  
Stainless Steel ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Industrial Applications ◽  
Inhibitor Concentration ◽  
Acidic Media ◽  
Content Type ◽  
316 Stainless Steel ◽  
First Time ◽  
Mixed Type Inhibitor

Purpose – The purpose of this paper is to describe the behavior of 2-mercaptobenzothiazole (MBT) on the corrosion of 316 stainless steel (SS) in acidic media and the mechanism of its action. Design/methodology/approach – The inhibitive effect of MBT towards the corrosion of 316 SS in acid solution is studied by means of weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy. The effect of inhibitor concentration and temperature against inhibitor action is investigated. Adsorption isotherm and adsorption mechanism are also discussed. Findings – MBT acts as inhibitor for this type of steel in acidic medium. This compound is mixed-type inhibitor and inhibition efficiency increased with increasing inhibitor concentration. MBT retards the rate of both anodic and cathodic corrosion reactions by adsorbing and forming a layer on the steel surface and the adsorption obeys Temkin adsorption isotherms. The inhibition efficiency is temperature dependence in the range from 25 to 65°C and some thermodynamic parameters were calculated and analyzed. Originality/value – The results shown in this paper are an insight to the understanding of the corrosion resistance and electrochemical behavior of 316 SS in the presence of MBT for future industrial applications and development. It is the first time that corrosion inhibition effects of MBT on 316 SS have been evaluated.

Deposition of TiN and TiAlVN thin films by DC magnetron sputtering

2019 ◽  
Vol 11 (6) ◽  
pp. 819-831 ◽  
Author(s):  
Bassam Abdallah ◽  
M. Kakhia ◽  
W. Alsadat
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Magnetron Sputtering ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
High Vacuum ◽  
Dc Magnetron Sputtering ◽  
Content Type ◽  
Pure Argon ◽  
Tin Film

Purpose TiN and TiAlVN films have been prepared by DC magnetron sputtering technique at room temperature. TiN target has been used to deposit TiN thin film under pure argon (100 percent Ar) gas. Additionally, Ti6Al4V alloy target has been used to deposit TiAlVN under nitrogen and argon gas (50 percent Ar and 50 percent N2). In this paper, two substrate types have been used: stainless steel 304 and Si(100). This analysis has confirmed that the nitride films, (TiN/Si) and TiAlVN in both cases, have been produced. Energy Depressive X-ray Spectroscopy (EDX) measurement confirmed that the TiN/Si was stoichiometry, where the N/Ti ratio was about 1 with low oxygen contamination. The results obtained have indicated that the TiAlVN has more resistance to corrosion than TiN film in 3.5 percent NaCl at 25°C (seawater). Both films, TiAlVN/SS304 and TiN/SS304, have shown improved corrosion resistance compared with virgin 304 substrate. Microhardness was carried out using Vickers method; the microhardness values for TiN/SS304 and TiAlVN/SS304 were approximately 7.5 GPa and 25.3 GPa, respectively. The paper aims to discuss these issues. Design/methodology/approach The films were prepared by a DC magnetron sputtering system starting from high pure (99.99 percent) Ti6Al4V target (Al 6wt%, V 4wt% and balance Ti) in plasma discharge argon/nitrogen (50 percent Ar and 50 percent N2) for deposition of TiAlVN film. Pure TiN target (99.99 percent) was used for preparation of TiN film in pure argon plasma. The diameter of target was 50 mm and the power applied for preparation of the two films was 100 W. A cylindrical high-vacuum chamber (Figure 2) made of stainless steel 316, with height 363 mm diameter, was fabricated locally. Scanning electron microscope images have been used to discover the films morphology. The composition of the films has been determined by EDX technique for films deposited on Si substrate. The electrochemical corrosion test was carried out using conventional three-electrode cell of 300 ml capacity by using Voltalab PGZ 301 system (France) using Tafel extrapolation method and electrochemical impedance spectroscopy techniques. Findings TiN and TiAlVN films have been prepared by DC magnetron sputtering technique without heating of the substrates holder. The effects of the composition of nitride films on mechanical and corrosion properties were investigated. The composition of the films has been determined by EDX technique. The effect of using titanium alloy (Ti with Al and V) on the composition and crystalline quality has been investigated. The microhardness is strongly dependent on the addition of the Al and V elements, and it consequently improves mechanical proprieties. The microhardness values for TiN/SS304 were approximately 7.5 GPa and 25.3 GPa for TiAlVN/SS304. They indicate that prepared films prevent the aggressive action of corrosion media. Originality/value TiN and TiAlVN films have been prepared by DC magnetron sputtering method at room temperature. Titanium nitride film, especially TiAlVN, is an effective method to improve the corrosion resistance of SS304. TiAlVN film has exhibited enhanced corrosion resistance and higher microhardness. Independent time-of-flight elastic recoil detection analysis has been used to determine the composition of the film.

Development and characterisation of multifunctional composite coatings using bio-based additives

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Gerard Ong ◽  
Ammar Shafaamri ◽  
Iling Aema Wonnie Ma ◽  
Ramesh Kasi ◽  
Ramesh Subramaniam
Keyword(s):  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Ethanolic Extract ◽  
Steel Corrosion ◽  
Bioactive Constituents ◽  
Adhesive Properties ◽  
Corrosion Properties ◽  
Content Type ◽  
Mild Steel Corrosion ◽  
Organic Corrosion Inhibitors

Purpose The purpose of this paper is to develop the bio-composite organic coatings by adding the bio-based additives that are extracted from banana peels and henna leaves as the organic corrosion inhibitors. Design/methodology/approach Bioactive constituents with inhibition properties are extracted from banana peels and henna leaves by using ethanol to form the ethanolic extract. The inhibiting efficiency of these bioactive constituents on mild steel corrosion in 3.5% sodium hydroxide (NaCl) solution is investigated. The investigation is performed using electrochemical impedance studies for 30 days. The optical and adhesive properties of the bio-composite coating systems have also been studied. Findings The best protection is obtained as the loading ratio of the banana peels ethanolic extract (BPEE) and henna leaves ethanolic extract (HLEE) are 10 Wt.% and 30 Wt.%, respectively. Overall, the results obtained show that the BPEE and HLEE not only enhance the optical properties but also can serve as an effective inhibitor for corrosion without affecting the adhesiveness of the neat acrylic properties. Originality/value Banana peels and henna leaves consist of bioactive constituents that have anti-corrosion properties which could inhibit corrosion.

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