Calcium carbonate particles loaded with triethanolamine and polyethylenimine for enhanced corrosion protection of epoxy coated steel

Raj, Roma; Morozov, Yegor; Calado, Lénia M.; Taryba, Maryna; Kahraman, Ramazan; Shakoor, Abdul; Montemor, M.F.

doi:10.1016/j.corsci.2020.108548

Cited by 37 publications

(28 citation statements)

References 36 publications

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“…Figure depicts the equivalent electrical circuits (ECs) used for fitting the experimental data of the different coatings. A two-time constant circuit Figure A was employed to quantify the various impedance data of SLPC, whereas a three-time constant electric circuit Figure B was used to analyze DLPC. , The electric circuit in Figure A comprises the following electrical parameters: the solution resistance ( R s ), the constant phase element (CPE L ) representing the capacitance of the coating layer, the resistance offered by the coating to the passage of the electrolyte ( R po ), the constant phase element (CPE dl ) representing the double-layered capacitance of the interface between the metal and the penetrated electrolyte, and the charge-transfer resistance at the metal interface ( R ct ). Moreover, in the DLPC equivalent circuit shown in Figure B, the top layer offered an extra time constant connected in series with the SLPC equivalent circuit, which has R po1 and CPE L1 as pore resistance improvises capacitance.…”

Section: Results and Discussionmentioning

confidence: 99%

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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Smart polymeric composite coatings demonstrating multilevel self-healing characteristics were developed and characterized. The pHresponsive smart carriers were synthesized by loading halloysite nanotubes (HNTs) with the benzotriazole corrosion inhibitor (BTA) using the vacuum cycling method, referred to as (BTA-loaded HNTs). Similarly, mechanically triggered melamine urea-formaldehyde microcapsules encapsulated with the boiled linseed oil-self-healing agent (LO) denoted as (MUFMCs) having an average size of a ∼120 μm diameter with a wall thickness of ∼1.84 μm were synthesized by the in situ polymerization technique. The newly designed double-layered smart polymeric composite coatings (DLPCs) were developed by mixing 3 wt % BTA-loaded HNTs with epoxy and applying it on the clean steel substrate to form a primer layer. After its complete curing, a top layer of epoxy containing 5 wt % of MUFMCs was deposited on it. For an exact comparison, single-layer polymeric composite coatings (SLPCs) containing 3 wt % BTA-loaded HNTs were also developed. The Fourier transform infrared radiation spectra of MUFMCs and BTA-loaded HNTs indicate the existence of all desired functional groups, confirming the presence of loaded chemical species such as LO and BTA into the smart carriers. Thermogravimetric analysis (TGA) indicates that ∼18% BTA is successfully loaded into HNTs. Quantitative UV-spectroscopic analysis indicates a pH-responsive release of BTA from BTA-loaded HNTs, which is time-dependent, attaining its maximum value of ∼ 90% in an acidic medium after 30 h. Electrochemical impedance spectroscopy analysis conducted in 3.5 wt % NaCl solution at room temperature for different immersion times reveals that SLPC exhibits the maximum chargetransfer resistance (R ct ) of 55.47 GΩ cm 2 after the 7th day of immersion, and then, a declining trend is observed, reaching 26.6 GΩ cm 2 after the 9th day. However, in the case of DLPC, the R ct values show a continuous increment, attaining a maximum value of 82.11 GΩ cm 2 after the 9th day of immersion. The improved performance of DLPC can be ascribed to the efficient triggering of the individual carriers in the isolated matrices, resulting in the release of LO and BTA to form individual protective films at the damaged area due to the oxidative polymerization process and triazoles' ability of passive film formation on the substrate, respectively. The tempting self-healing properties of DLPCs justify their decent role for long-term corrosion protection in many industrial applications.

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Section: Results and Discussionmentioning

confidence: 99%

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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“…The direct addition of corrosion inhibitors into coatings formulation may provide good efficiency but usually, this may lead to unwanted reactions and degradation of the coating matrix which causes early leaching of the inhibitors and decreases the barrier properties of the coating [ 11 , 12 ]. This drawback has been circumvented thanks to the use of carriers loaded with the inhibitors that also helps to enhance the barrier properties of the coating [ 13 , 14 ]. This strategy also helps to prevent unnecessary leaching of inhibitors and achieve more economical and efficient use of the corrosion inhibitors.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Epoxy Coating Modified with Yttrium Oxide Loaded with Imidazole on the Corrosion Protection of Steel

et al. 2021

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The search for highly effective corrosion protection solutions to avoid degradation of the metallic parts is enabling the development of polymeric organic coatings. Of particular relevance, polymeric nanocomposite coatings, modified with corrosion inhibitors, have been developed to provide enhanced surface protection. In this work, yttrium oxide nanoparticles loaded with corrosion inhibitor (Imidazole), used as additives in the formulation of epoxy for coated on the steel substrate. The loading of Y2O3 with imidazole was confirmed by field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and Brunauer–Emmett–Teller analysis. UV-Vis analysis demonstrated the pH-sensitive behavior of the imidazole that helps in self-release when necessary. Electrochemical impedance spectroscopy (EIS) of the coated samples revealed that the coating modified with Y2O3/IMD provides better corrosion protection compared to coatings containing only Y2O3. XPS analysis validated the presence of an imidazole protective film on the steel substrate that enhanced the corrosion resistance of the coated samples

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“…The typical impedance values could vary from 100 to 10 k ; this difference could vary by electrodes distance and position, as described by Alexander and Orazem (2020a), where the Rp measured in the same reinforced concrete sample changed by 10 times due to the position of the electrodes on the surface. However, the corrosion measurement by impedance techniques could also test the effectiveness of anti-corrosive coatings, testing coated and uncoated samples (Alvarez-Pampliega et al, 2014;Raj et al, 2020) to test anti-corrosive coats properties. Those tests and measurements require an advanced electrochemical device such as the Autolab PGSTAT302 and algorithms developed to extract the information from the data like MATLAB.…”

Section: Typical Techniques Of Measurementmentioning

confidence: 99%

Portable Measurement Systems Based on Microcontrollers to Test Durability of Structures: Mini-Review

Segura

Osma

2020

Front. Built Environ.

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Corrosion presence is a recurrent concern in buildings and structures that use steel as their core or as reinforcement, due to the change of steel's properties caused by this phenomena. Therefore, methods to detect and quantify corrosion had been developed; some are based on electrical and electrochemical measurements. On reinforced concrete structures, sometimes there are exposed steel bars which are visible, but on those, a visual inspection could determine corrosion presence. There exist different options to measure the steel bars' corrosion and its level. The more straight forward consists of cutting through the concrete until the bar is exposed and connecting a measurement device there. A disadvantage of this technique is that steel has to be exposed to the environment during the measurement; as an alternative, novel contact-less electrochemical techniques are getting more popular. Recent advances in low-cost and portable electrochemical devices and embedded sensors can change how the structures are tested. Moreover, there is a discussion about how those devices, if developed for other fields as biosensors, can assist in other areas. This mini-review also gives some hints of what the future trends could be due to the combination of those areas.

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Calcium carbonate particles loaded with triethanolamine and polyethylenimine for enhanced corrosion protection of epoxy coated steel

Cited by 37 publications

References 36 publications

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Effectiveness of Epoxy Coating Modified with Yttrium Oxide Loaded with Imidazole on the Corrosion Protection of Steel

Portable Measurement Systems Based on Microcontrollers to Test Durability of Structures: Mini-Review

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