Corrosion protection of epoxy coating with pH sensitive microcapsules encapsulating cerium nitrate

Matsuda, Takeshi; Kashi, Kiran B.; Fushimi, Koji; Gelling, Victoria J.

doi:10.1016/j.corsci.2018.12.012

Cited by 49 publications

(19 citation statements)

References 54 publications

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“…For example, aluminum alloys suffer from pitting corrosion in environments containing chloride since alloying elements such as Cu, Mg, and Al form intermetallic phases and initiate localized corrosion reactions, thereby forming pits. [ 56 ] The corrosion process is catalyzed by humidity and acidic environments due to the presence of ions.…”

Section: Self‐healing Under Extreme Environmentsmentioning

confidence: 99%

“…[ 69 ] A pH‐sensitive microcapsule composed of a cross‐linked polyester shell and containing cerium nitrate as the inhibitor was designed to release the inhibitors in response to a hydrolysis reaction. [ 56,70 ] The under‐film corrosion of a steel sheet was suppressed by addition of pH sensitive microcapsules to the coating matrix. The subsequent release of cerium ions was confirmed on a corroding steel surface.…”

Section: Self‐healing Under Extreme Environmentsmentioning

confidence: 99%

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Challenges and Opportunities of Self‐Healing Polymers and Devices for Extreme and Hostile Environments

et al. 2021

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Engineering materials and devices can be damaged during their service life as a result of mechanical fatigue, punctures, electrical breakdown, and electrochemical corrosion. This damage can lead to unexpected failure during operation, which requires regular inspection, repair, and replacement of the products, resulting in additional energy consumption and cost. During operation in challenging, extreme, or harsh environments, such as those encountered in high or low temperature, nuclear, offshore, space, and deep mining environments, the robustness and stability of materials and devices are extremely important. Over recent decades, significant effort has been invested into improving the robustness and stability of materials through either structural design, the introduction of new chemistry, or improved manufacturing processes. Inspired by natural systems, the creation of self‐healing materials has the potential to overcome these challenges and provide a route to achieve dynamic repair during service. Current research on self‐healing polymers remains in its infancy, and self‐healing behavior under harsh and extreme conditions is a particularly untapped area of research. Here, the self‐healing mechanisms and performance of materials under a variety of harsh environments are discussed. An overview of polymer‐based devices developed for a range of challenging environments is provided, along with areas for future research.

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Section: Self‐healing Under Extreme Environmentsmentioning

confidence: 99%

Section: Self‐healing Under Extreme Environmentsmentioning

confidence: 99%

Challenges and Opportunities of Self‐Healing Polymers and Devices for Extreme and Hostile Environments

et al. 2021

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“…However, Mg's major drawbacks come from the high degradation rate in the body and poor corrosion resistance in most environments. Much research has been taken to focus on modifying the microstructure by alloying, heat treatments, and applying common corrosion protection methods such as coatings and inhibitors as the alternative method to improve its corrosion resistance [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Role of Aluminium on the Microstructure and Corrosion Behaviour of Magnesium Prepared by Powder Metallurgy Method

Alias¹

2020

IJAME

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Much research on magnesium (Mg) emphasises creating good corrosion resistance of magnesium, due to its high reactivity in most environments. In this study, powder metallurgy (PM) technique is used to produce Mg samples with a variation of aluminium (Al) composition. The effect of aluminium composition on the microstructure development, including the phase analysis was characterised by optical microscope (OM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). The mechanical property of Mg sample was performed through Vickers microhardness. The results showed that the addition of aluminium in the synthesised Mg sample formed distribution of Al-rich phases of Mg17Al12, with 50 wt.% of aluminium content in the Mg sample exhibited larger fraction and distribution of Al-rich phases as compared to the 20 wt.% and 10 wt.% of aluminium content. The microhardness values were also increased at 20 wt.% and 50 wt.% of aluminium content, comparable to the standard microhardness value of the annealed Mg. A similar trend in corrosion resistance of the Mg immersed in 3.5 wt.% NaCl solution was observed. The corrosion behaviour was evaluated based on potentiodynamic polarisation behaviour. The corrosion current density, icorr, is observed to decrease with the increase of Al composition in the Mg sample, corresponding to the increase in corrosion resistance due to the formation of aluminium oxide layer on the Al-rich surface that acted as the corrosion barrier. Overall, the inclusion of aluminium in this study demonstrates the promising development of high corrosion resistant Mg alloys.

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“…Corrosion inhibitors can be incorporated in active layers by directly mixing inhibitors with coating components, encapsulation of corrosion inhibitors in nanoparticles, micro/nanocapsules, nanofibers, and conjugation of corrosion inhibitor via labile or non‐labile bonds to polymers coatings . Conjugation of corrosion inhibitors to polymer structures via stimuli‐cleavable linkages allow sustained release of corrosion inhibitors upon changes of environments due to corrosion, such as change of pH value or electrochemical potential.…”

Section: Introductionmentioning

confidence: 99%

Controlling Release Kinetics of Payloads from Polymer Conjugates by Hydrophobicity

Seidi

Couffon

Prawatborisut

et al. 2019

Macro Chemistry & Physics

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Polymers conjugated with active molecules are useful for controlled delivery of corrosion inhibitors, phytosanitary products, and drugs. To avoid detrimental side effects, active molecules need to be selectively released upon specific external stimuli. Imine groups are highly acid‐labile linkages that are usually hydrolyzed in a few hours even in neutral medium, which can be detrimental when slow release of payloads is needed. Herein, release kinetics are adjusted by controlling hydrophobicity of pH‐responsive polymers. 5‐(Aminomethyl)‐8‐hydroxyquinoline (AM8HQ), an effective corrosion inhibitor, is conjugated via imine linkage to aldehyde pendant groups in three different copolymers. Release kinetics of AM8HQ from polymer nanoparticles are investigated in acidic and neutral media. Very fast release from polymethacrylate‐based and slow release from polystyrene‐based polymer conjugates clearly show that adjusting the hydrophobicity of the polymer backbone is an effective synthetic strategy to control the cleavage rate of highly labile imine bonds.

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Corrosion protection of epoxy coating with pH sensitive microcapsules encapsulating cerium nitrate

Cited by 49 publications

References 54 publications

Challenges and Opportunities of Self‐Healing Polymers and Devices for Extreme and Hostile Environments

Challenges and Opportunities of Self‐Healing Polymers and Devices for Extreme and Hostile Environments

Role of Aluminium on the Microstructure and Corrosion Behaviour of Magnesium Prepared by Powder Metallurgy Method

Controlling Release Kinetics of Payloads from Polymer Conjugates by Hydrophobicity

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