Cerium-loaded algae exoskeletons for active corrosion protection of coated AA2024-T3

Denissen, Paul J.; Garcia, Santiago J.

doi:10.1016/j.corsci.2017.09.019

Cited by 40 publications

(34 citation statements)

References 38 publications

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“…From the Bode plot in Figure it can be seen that partial crosslinking leads to a very clear improvement compared to the noncrosslinked sample 10Ce. The crosslinked sample shows higher impedance and phase angles in the low‐frequency range which remain stable for a long immersion period of up to around 670 h, which is four times longer protection than the noncrosslinked Ce‐containing system, and about 11 times longer than results reported with epoxy coatings directly loaded with Ce‐salt inhibitors for comparable coatings and damages . It is worth noting that such numerical differences should be taken as reference and not as definite values as this would require higher sampling for statistical reasons.…”

Section: Resultsmentioning

confidence: 90%

“…All coatings had a multilayer assembly (see the Experimental Section) consisting of (i) a base layer to prevent fast delaminations, (ii) an electrospun inhibiting nanonetwork, and (iii) a protective topcoat as represented in Figure f. For the corrosion evaluation we used a hyphenated optical and electrochemical setup allowing us to simultaneously monitor electrochemical responses such as open circuit potential (OCP) and electrochemical impedance by electrochemical impedance spectroscopy (EIS) and time‐lapsed optical images of the exposed area under immersion as reported elsewhere . This hyphenated approach allowed for a more detailed analysis of the ongoing degradation processes and the protection levels achieved.…”

Section: Resultsmentioning

confidence: 99%

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Long‐Term Active Corrosion Protection of Damaged Coated‐AA2024‐T3 by Embedded Electrospun Inhibiting Nanonetworks

Dieleman

Denissen

Garcia

2018

Adv Materials Inter

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the inhibitor from the matrix so unwanted reactions do not take place; and (ii) allow for the controlled release of the inhibitor (controlled kinetics or on-demand release). Many materials, shapes, sizes, and triggers have been developed using this basic principle ranging from microcapsules and nanocapsules relying on delamination to initiate the redox triggered release, to loaded nanosized porous zeolites and halloysite nanotubes where release relies on leaching and ion exchange. [1] Despite the clear success of the concept, two intrinsic limitations can be identified: (i) loading in nanoparticles is limited and bound to carrier-inhibitor pairs; and (ii) inhibitor release at a damage site greatly depends on particle size, release trigger, loading, and distribution. [2] As a consequence the long-term protection and protection at relatively big damages is compromised. [2b] Here we propose an alternative strategy based on the formation of low-density and/or humidity responsive interconnected paths of inhibitor inside the coating (i.e., inhibiting nanonetworks) as a way to overcome the above limitations. Such a strategy is based on recent findings by Hughes et al. [3] who recently attributed high inhibition of Cr(VI)-based coatings to the formation of inhibitor interconnected clusters and low density regions in the coating, thereby confirming previous modelling works. [2] In order to experimentally proof the validity of the concept we used the well-established process of electrospinning as the method to manufacture the responsive nanofiber mats containing corrosion inhibitors to form the inhibiting nano networks in the coatings. During the relatively simple process of electrospinning a membrane or fiber mat of polymeric fibers can be produced by applying an electric field between a spinneret, usually a needle of a syringe filled with polymer solution, and a grounded conductive collector. [4] By controlling the process parameters, spinning setup complexity, and the polymer solution physical properties, a large amount of geometries can be designed making it a suitable process for the design of membranes, drug delivery systems, and carriers of liquid self-healing agents for composites among others. [5] Cu-rich aluminum alloy AA2024-T3 is here used as the substrate to prove the corrosion inhibiting potential of the concept. This highly used aerospace grade aluminum alloy is known for its high corrosion In this work, a new concept is introduced for active corrosion protection at damaged sites aiming at overcoming existing limitations of currently proposed strategies based on dispersed inhibitor-loaded nanocontainers in coatings. The underlying principle is based on the formation of lowdensity and/or humidity responsive interconnected paths of inhibitor in the coating, what is called inhibiting nanonetworks. Such an approach allows for (on-demand) long-term local supply of corrosion inhibitor at the damage site.For the proof-of-concept, water responsive inhibiting nanonetworks based on polyvinyl alcohol and two known...

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Long‐Term Active Corrosion Protection of Damaged Coated‐AA2024‐T3 by Embedded Electrospun Inhibiting Nanonetworks

Dieleman

Denissen

Garcia

2018

Adv Materials Inter

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“…As immersion time increases from 24 to 48 hours, more diffusion of corrosive solution results in the formation of defects inside the coating which on one hand degrades coating, but on the other hand activates the self‐healing mechanism by discharging and releasing benzotriazole at the damage location, and by creating corrosion products, creates a barrier against corrosive ions (chlorine ions), and also creates a compressed film at the interface of solution and substrate, which increases the corrosion resistance of system . Moreover, it should be mentioned that the ceramic coatings, despite polymeric coatings, act as dielectric materials and are permeable and electrolyte can only reach the surface of substrate through their defects and cracks …”

Section: Resultsmentioning

confidence: 99%

“…36 Moreover, it should be mentioned that the ceramic coatings, despite polymeric coatings, act as dielectric materials and are permeable and electrolyte can only reach the surface of substrate through their defects and cracks. 37 For more precise investigation on the behavior of obtained coatings, a resistor-capacitor equivalent circuit as per physical system mechanism which models the obtained data in a best modified way was designed and modeled using ZPlote software. The utilized equivalent circuit in this study is presented in Figure 7.…”

Section: Investigation Of Corrosion Behavior and Self-healingmentioning

confidence: 99%

A study on the effect of presence of CeO₂ and benzotriazole on activation of self‐healing mechanism in ZrO₂ ceramic‐based coating

Dezfuli

Sabzi

2018

Int J Applied Ceramic Tech

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In this study, the effect of presence of CeO2 and benzotriazole inhibitor agent on activation of self‐healing reactions and the corrosion behavior of ZrO2 ceramic‐based coating are evaluated. The ZrO2 and ZrO2‐CeO2‐benzotriazole ceramic‐based coatings were synthesized using sol–gel process and heat treated at 150°C. Afterward, X‐ray diffraction analysis (XRD), and Field Emission Scanning Electron Microscopy (FE‐SEM) were utilized to evaluate the phase analysis and morphology of these coatings. In addition, Energy Dispersive Spectroscopy (EDS) was used for elemental analysis of obtained coatings. Corrosion and self‐healing behavior of the coatings were investigated in 3.5 wt% NaCl solution using Electrochemical Impedance Spectroscopy (EIS) and potentiodynamic polarization tests. The results of XRD analysis revealed the amorphous nature of both coatings. FE‐SEM observations and EDS analysis results showed the presence of benzotriazole inhibitor agent and self‐healing reactions in the cracks and defects of ZrO2‐CeO2‐benzotriazole ceramic‐based coating. Moreover, results of electrochemical tests revealed that the presence of CeO2 and benzotriazole inhibitor agent in the ZrO2 ceramic‐based coating results in intense increases in the corrosion resistance of this coating by activating the self‐healing mechanism and forming passive layers.

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“…As a result, the research works are being sought to find a more benign corrosion prevention technologies based on eco-friendly pigments 12,[22][23][24] . Rare earth metal compounds are suggested as alternative materials for chromates to improve the corrosion properties of the metallic substrates 16,[25][26][27][28][29][30][31] . Among all of the rare earth compounds, it has been shown that the cerium-based compounds are the most effective materials to provide aluminum alloy protection performance against corrosion 30,[32][33][34][35] .…”

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Cerium/diethyldithiocarbamate complex as a novel corrosion inhibitive pigment for AA2024-T3

Mohammadi

Shahrabi

Mahdavian

et al. 2020

Sci Rep

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In this work, cerium-diethyldithiocarbamate (Ce-DEDTC) complex was synthesized as a novel anticorrosion pigment. the structure of the synthesized pigment was characterized by employing fourier transfer infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, inductively coupled plasma optical emission spectroscopy, and ultraviolet-visible spectroscopy. All of the characterization techniques showed that the Ce-DEDTC pigment was successfully produced. The electrochemical tests were used to investigate the subsequence effect of the synthesized complex on the corrosion behavior of the AA2024-T3. AA2024-T3 showed a wide passive range in the presence of the Ce-DEDTC pigment. Scanning electron microscopy, optical microscopy, X-ray photoelectron spectroscopy, and contact angle tests were employed to investigate the effect of the synthesized pigment on aluminum surface properties. The result illustrated that the existence of the Ce-DEDTC complex led to the creation of a thin film on the AA2024-T3 surface, which was significantly inhibited the localized corrosion of the aluminum alloy.Due to high strength to weight ratio and low density, aluminum, and its alloys have found various industrial applications 1-3 . AA2024-T3 which is the precipitation hardening alloy, has various engineering applications in aeronautics and aerospace industries 4 . S-phase Al 2 MgCu and Al-Cu-Fe-Mn are the main intermetallic compounds in the structure of the 2024-T3 aluminum alloy 4,5 . In the presence of these intermetallic compounds, the substrate is locally degraded, especially in the presence of halide species 5 . The utilization of coatings, especially organic coatings, is a promising method to improve the corrosion performance of aluminum alloy against aggressive solutions 6 . But, it is well-known that the organic coatings alone don't have the long-term protective behavior against the aggressive ions. Due to the permeation of the oxygen, water, and corrosive ions through the organic coatings, as the main corrosive species for the metallic substrates, the metal is degraded even in the presence of the organic coatings 7 . Therefore, for improving the ability of the organic coatings against the destructive species, the use of other materials is a requirement.Inhibitive pigments are the main additives used to improve the corrosion protection functioning of the organic coatings in corrosive media. Pigments are utilized in different types and they have different protection mechanisms [8][9][10] . It is generally believed that the pigments are the fine particle size and insoluble materials used as colloidal dispersions which are added to the organic coatings for various purposes 11 . Providing the color, modifying the applications of the coatings, reducing the cost and improving the performance of the coatings are the main pigment applications 11 . Enhancing the organic coatings corrosion inhibition is the most important application of the pigments. Although it was mentioned that the pigments are the insoluble materials, the corrosi...

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Cerium-loaded algae exoskeletons for active corrosion protection of coated AA2024-T3

Cited by 40 publications

References 38 publications

Long‐Term Active Corrosion Protection of Damaged Coated‐AA2024‐T3 by Embedded Electrospun Inhibiting Nanonetworks

Long‐Term Active Corrosion Protection of Damaged Coated‐AA2024‐T3 by Embedded Electrospun Inhibiting Nanonetworks

A study on the effect of presence of CeO₂ and benzotriazole on activation of self‐healing mechanism in ZrO₂ ceramic‐based coating

Cerium/diethyldithiocarbamate complex as a novel corrosion inhibitive pigment for AA2024-T3

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Cerium-loaded algae exoskeletons for active corrosion protection of coated AA2024-T3

Cited by 40 publications

References 38 publications

Long‐Term Active Corrosion Protection of Damaged Coated‐AA2024‐T3 by Embedded Electrospun Inhibiting Nanonetworks

Long‐Term Active Corrosion Protection of Damaged Coated‐AA2024‐T3 by Embedded Electrospun Inhibiting Nanonetworks

A study on the effect of presence of CeO2 and benzotriazole on activation of self‐healing mechanism in ZrO2 ceramic‐based coating

Cerium/diethyldithiocarbamate complex as a novel corrosion inhibitive pigment for AA2024-T3

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A study on the effect of presence of CeO₂ and benzotriazole on activation of self‐healing mechanism in ZrO₂ ceramic‐based coating