Self-healing corrosion inhibition coatings with pH-responsive activity by incorporation of nano cellulose in two pack epoxy polyamide system

Devadasu, Sushmitha; Sonawane, Shirish H.; Suranani, Srinath

doi:10.1016/j.matpr.2020.09.341

Cited by 7 publications

(7 citation statements)

References 36 publications

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“…This could be due to the fast dissolution of the tube fines and natural surface pocket-loaded BTA and BTA stored at the laxly rolled surface clay sheets ends 64 since there were not any tube end stoppers formed or polyelectrolytes encapsulating the tubes to control the release as previous literature studies proposed. 50,64,65 The second stage is slower, almost fully releasing BTA within 30 h, reaching 90, 80, and 55% for acidic, basic, and neutral mediums, respectively. The different percentages of release rates are an indication of the pH-responsive release mechanism.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…This is because secondary amines were protonated to form ammonium groups, which induced electrostatic repulsion with cerium (III) cations and consequently their release. [117] Similarly, benzotriazole (BTA) in cellulose nanofibers [110] and polyaniline capsules [111] was released via breaking metal complex interaction between copper ions and BTA molecules in acidic conditions. Triazole groups of BTA present in lignin microspheres (see Figure 8b) were protonated in acid conditions to form positively charged molecules, leading to a subsequent release of BTA from microparticles due to electrostatic repulsive forces.…”

Section: Ph-responsive Materialsmentioning

confidence: 99%

“…For the second mechanism, examples are corrosion inhibitors containing carboxyl groups (such as nicotinic acid, [122] 3NiSA, [37,39,121] and oleic acid, [96,97] ) and hydroxyl groups (tannic acid [95,102] and 1-diphosphonic acid [99] ) that can be deprotonated in basic corrosive environments to form negatively charged molecules, which chelated with metal ions at corroded surfaces to produce protective layers. Finally, organic corrosion inhibitors with sulfur, oxygen, or nitrogen heterocyclic structure (such as tryptamine, [50,52] 8-HQ, [51,89,90,115,116,146] MBT, [53,101,108,119,121,136] MBI, [97,136] BTA, [79,93,98,100,102,103,107,[110][111][112][113]122,123,136,150,172] and 2,5dimercapto-1,3,4-thiadiazole) [134] provide self-healing ability via physi-or chemisorption on corroded metal surfaces to form anticorrosive thin films through electrostatic interactions or coordination complexes Similarly, organic corrosion inhibitors containing heteroatoms (nitrogen, sulf...…”

Section: Corrosion Inhibitorsmentioning

confidence: 99%

Corrosion‐Responsive Self‐Healing Coatings

2023

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Organic coatings are one of the most popular and powerful strategies for protecting metals against corrosion. They can be applied to in different ways, such as by dipping, spraying, electrophoresis, casting, painting, or flow coating. They offer great flexibility of material designs and cost effectiveness. Moreover, since about 20 years self‐healing has evolved as a new research topic for protective organic coatings. Responsive materials play a crucial role in this new research field. However, for a really targeted development of high performance self‐healing coatings for corrosion protection, it is not sufficient just to focus on smart responsive materials and suitable active agents for self‐healing. A better understanding of how coatings can react on different stimuli induced by corrosion, how these stimuli can spread in the coating and how the released agents can reach the corroding defect is also of high importance. Such knowledge would allow to design coatings which are optimised for specific applications. Herein, the requirements and possibilities from the corrosion and synthesis perspectives for designing materials for preparing self‐healing coatings for corrosion protection are discussed.This article is protected by copyright. All rights reserved

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“…[10][11][12][13][14] Much interest has been drawn towards using cellulose nanocrystals (CNCs) as a component in different water-borne polymer matrices for coating on metallic surfaces via traditional coating methods (e.g., casting, paint brush, tube applicator). [15][16][17][18][19][20] This interest is mainly attributed to the sustainability and the exceptional inherent properties of CNCs such as high crystallinity (B80-90%), 21 outstanding elastic modulus (145-150 GPa), 22 and high thermal stability (decomposition T B 200-300 1C). 23 However, the uniform distribution of CNCs in organic coatings and the process used to apply the coating may affect the adhesion to metallic surface and should be tuned coherently while making these materials commercially viable.…”

Section: Introductionmentioning

confidence: 99%

“…, casting, paint brush, tube applicator). 15–20 This interest is mainly attributed to the sustainability and the exceptional inherent properties of CNCs such as high crystallinity (∼80–90%), 21 outstanding elastic modulus (145–150 GPa), 22 and high thermal stability (decomposition T ∼ 200–300 °C). 23 However, the uniform distribution of CNCs in organic coatings and the process used to apply the coating may affect the adhesion to metallic surface and should be tuned coherently while making these materials commercially viable.…”

Section: Introductionmentioning

confidence: 99%