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Márton P, Szolnoki B, Nagy N, Deák A, Zámbó D, Szabó GS, Hórvölgyi Z. Wetting and swelling behaviour of N-acetylated thin chitosan coatings in aqueous media. Heliyon 2024; 10:e23201. [PMID: 38163124 PMCID: PMC10755330 DOI: 10.1016/j.heliyon.2023.e23201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/24/2023] [Accepted: 11/29/2023] [Indexed: 01/03/2024] Open
Abstract
Chitosan nanocoatings (thickness range of 120-540 nm) were produced on glass, zinc and silicon substrates with dip-coating and spin coating techniques to study their pH-dependent wetting and swelling behaviour. The coatings were N-acetylated with the methanolic solution of acetic anhydride to increase the degree of acetylation from 36 % to 100 % (according to ATR-FTIR studies). The measured contact angles of Britton-Robinson (BR) buffer solutions (pH 6.0, 7.4 and 9.0) were lower on the acetylated surfaces (ca. 50°), than that of their native counterparts (ca. 70°) and does not depend on the pH. Contrary, contact angles on the native coating deteriorated 10°-15° with increasing the pH. In addition, for native coatings, the decrease of the contact angles over time also showed a pH dependence: at pH 9.0 the contact angle decreased by 7° in 10 min, while at pH 6.0 it decreased by 13° and at a much faster rate. The constraint swelling of the coatings in BR puffer solutions was studied in situ by scanning angle reflectometry. The swelling degree of the native coatings increased significantly with decreasing pH (from 250 % to 500 %) due to the increased number of protonated amino groups, while the swelling degree of acetylated coatings was ca. 160 % regardless of the pH. The barrier properties of the coatings were studied by electrochemical tests on zinc substrates. The analysis of polarization curves showed the more permeable character of the acetylated coatings despite the non-polar character of the bulk coating matrix. It can be concluded that in the case of native coatings, 49 % of the absorbed water is in bound form, which does not assist ion transport, while in the case of acetylated coatings, this value is only 33 %.
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Affiliation(s)
- Péter Márton
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, H-1111 Budapest, Hungary
| | - Beáta Szolnoki
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Organic Chemistry and Technology H-1111 Budapest, Hungary
| | - Norbert Nagy
- Institute for Technical Physics and Materials Science, Centre for Energy Research, H-1121 Budapest, Hungary
| | - András Deák
- Institute for Technical Physics and Materials Science, Centre for Energy Research, H-1121 Budapest, Hungary
| | - Dániel Zámbó
- Institute for Technical Physics and Materials Science, Centre for Energy Research, H-1121 Budapest, Hungary
| | - Gabriella Stefánia Szabó
- Universitatea Babes-Bolyai, Department of Chemistry and chemical engineering of Hungarian Line of study, 11 Arany Janos str., RO-400028, Cluj-Napoca, Romania
| | - Zoltán Hórvölgyi
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, H-1111 Budapest, Hungary
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Ovari TR, Szőke ÁF, Katona G, Szabó GS, Muresan LM. Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin. Gels 2023; 9:gels9050361. [PMID: 37232953 DOI: 10.3390/gels9050361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/13/2023] [Accepted: 04/20/2023] [Indexed: 05/27/2023] Open
Abstract
In practice, metal structures are frequently transported or stored before being used. Even in such circumstances, the corrosion process caused by environmental factors (moisture, salty air, etc.) can occur quite easily. To avoid this, metal surfaces can be protected with temporary coatings. The objective of this research was to develop coatings that exhibit effective protective characteristics while also allowing for easy removal, if required. Novel, chitosan/epoxy double layers were prepared on zinc by dip-coating to obtain temporary tailor-made and peelable-on-demand, anti-corrosive coatings. Chitosan hydrogel fulfills the role of a primer that acts as an intermediary between the zinc substrate and the epoxy film to obtain better adhesion and specialization. The resulting coatings were characterized using electrochemical impedance spectroscopy, contact angle measurements, Raman spectroscopy, and scanning electron microscopy. The impedance of the bare zinc was increased by three orders of magnitude when the protective coatings were applied, proving efficient anti-corrosive protection. The chitosan sublayer improved the adhesion of the protective epoxy coating. The structural integrity and absolute impedance of the protective layers were conserved in both basic and neutral environments. However, after fulfilling its lifespan, the chitosan/epoxy double-layered coating could be removed after treatment with a mild acid without damaging the substrate. This was because of the hydrophilic properties of the epoxy layer, as well as the tendency of chitosan to swell in acidic conditions.
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Affiliation(s)
- Tamara-Rita Ovari
- Department of Chemical Engineering, Research Center in Electrochemistry and Non-Conventional Materials, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, Romania
| | - Árpád Ferenc Szőke
- Department of Chemistry and Chemical Engineering of the Hungarian Line, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, Romania
| | - Gabriel Katona
- Department of Chemistry and Chemical Engineering of the Hungarian Line, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, Romania
| | - Gabriella Stefánia Szabó
- Department of Chemistry and Chemical Engineering of the Hungarian Line, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, Romania
| | - Liana Maria Muresan
- Department of Chemical Engineering, Research Center in Electrochemistry and Non-Conventional Materials, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, Romania
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Márton P, Nagy ÖT, Kovács D, Szolnoki B, Madarász J, Nagy N, Szabó GS, Hórvölgyi Z. Barrier behaviour of partially N-acetylated chitosan layers in aqueous media. Int J Biol Macromol 2023; 232:123336. [PMID: 36708905 DOI: 10.1016/j.ijbiomac.2023.123336] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 01/09/2023] [Accepted: 01/15/2023] [Indexed: 01/27/2023]
Abstract
Chitosan coatings of 353 ± 12 nm thickness were prepared on glass and zinc substrates by dip-coating method to study their barrier-behaviour. The coatings were chemically modified to increase their degree of acetylation (DA) from ca. 44 % up to ca. 98 % resulting a quasi-chitin coating. The effect of the acetylation reaction was studied by infrared spectroscopy, and the structural changes of the native and acetylated coatings were investigated by UV-Vis spectrophotometry and X-ray diffraction. The surface properties of the coated samples were characterized by wettability measurements - advancing water contact angle decreased from ca. 80° (native) to ca. 43° (fully acetylated) - and microscopic (SEM, AFM) studies. The barrier behaviour of the chitosan layer depending on the DA was evaluated by electrochemical impedance spectroscopy studies and with a special mesoporous silica - chitosan bilayer system by measuring the amount of dye (Rhodamine 6G) accumulated in the silica through the chitosan coating during an impregnation step. These methods showed significant decrease in the barrier-effect of the coatings with increasing DA (accumulation of approximately six times more dye and a reduction of charge transfer resistance by an order of magnitude), due to the structural and ionization changes in the coatings.
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Affiliation(s)
- Péter Márton
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, H-1111 Budapest, Hungary.
| | - Örs Tamás Nagy
- Universitatea Babes-Bolyai, Department of Chemistry and Chemical Engineering of Hungarian Line of Study, 11 Arany Janos str., RO-400028 Cluj-Napoca, Romania.
| | - Dorina Kovács
- Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Materials Science and Engineering, H-1111 Budapest, Hungary.
| | - Beáta Szolnoki
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Organic Chemistry and Technology, H-1111 Budapest, Hungary.
| | - János Madarász
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Inorganic and Analytical Chemistry, H-1111 Budapest, Hungary.
| | - Norbert Nagy
- Institute for Technical Physics and Materials Science, Centre for Energy Research, H-1121 Budapest, Hungary.
| | - Gabriella Stefánia Szabó
- Universitatea Babes-Bolyai, Department of Chemistry and Chemical Engineering of Hungarian Line of Study, 11 Arany Janos str., RO-400028 Cluj-Napoca, Romania.
| | - Zoltán Hórvölgyi
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, H-1111 Budapest, Hungary.
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Li L, Cheng G, Chen X. Zeolitic imidazolate frameworks dispersed in waterborne epoxy resin to improve the anticorrosion performance of the coatings. E-POLYMERS 2022. [DOI: 10.1515/epoly-2022-0079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Abstract
Reasonable design of inorganic nano-base materials to promote the anticorrosion performance of waterborne epoxy resin (EP) coating remains a great challenge. Herein, we describe the preparation method and anticorrosion properties of zeolitic imidazolate framework (ZIF-67) composite coatings. ZIF-67 could be used as both anticorrosion filler and pigment for the coatings. The addition of ZIF-67 improved the impermeability of the coating, thus slowing down the chemical reaction on the surface of the substrate. The long-term corrosion-resistant performance of composite coatings (ZIF-67@EP) in 3.5% NaCl solution was evaluated comparatively. Before immersion, the low-frequency impedance of 1% ZIF-67@EP coating was 2.5 times of 0% ZIF-67@EP coating, and after 14 days of immersion, the low-frequency impedance of 1% ZIF-67@EP coating was still 1.8 times of 0% ZIF-67@EP coating. The corrosion rate of 1% ZIF-67@EP coating was decreased by 177 times.
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Affiliation(s)
- Li Li
- Test Center, Yanchang Oilfield Co., Ltd. , Yan’an , 716000 , China
| | - Gang Cheng
- Technical Center, Shaanxi Yanchang Oilfield Fracturing Materials Co. Ltd ., Yan’an , 716000 , China
| | - Xuyong Chen
- Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology , Xi’an , 710021 , China
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Li G, Ma Y, Wan H, Chen L, An Y, Ye Y, Zhou H, Chen J. Flake aluminum reinforced polyamideimide-polytetrafluoroethylene bonded solid lubricating composite coating for wear resistance and corrosion protection. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110485] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Szőke ÁF, Szabó GS, Hórvölgyi Z, Albert E, Végh AG, Zimányi L, Muresan LM. Accumulation of 2-Acetylamino-5-mercapto-1,3,4-thiadiazole in chitosan coatings for improved anticorrosive effect on zinc. Int J Biol Macromol 2020; 142:423-431. [PMID: 31593734 DOI: 10.1016/j.ijbiomac.2019.09.114] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/02/2019] [Accepted: 09/15/2019] [Indexed: 10/25/2022]
Abstract
Chitosan (Chit) coatings were applied on zinc substrates by the dip-coating method. Subsequently, the coatings were impregnated with a corrosion inhibitor, 2-Acetylamino-5-mercapto-1,3,4-thiadiazole (AcAMT) to obtain an increased anticorrosive effect. The coating thickness and the AcAMT accumulation were determined using UV-Vis spectroscopy on glass and quartz substrates, respectively. The surface morphology and coverage were investigated with atomic force microscopy. Electrochemical impedance spectroscopy and potentiodynamic polarization techniques were used to investigate the protective properties of the impregnated coatings. The chitosan coatings facilitated the accumulation of the corrosion inhibitor inside the polymeric matrix (a multiplication of 380 times compared to the impregnating solution concentration was calculated), channeling high amounts of AcAMT to the Zn surface, which resulted in an inhibition efficiency of >90%. This effect demonstrates the applicability of chitosan coatings as carriers for corrosion inhibitors, significantly reducing the amount of inhibitor needed to achieve good anticorrosive effects.
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Affiliation(s)
- Árpád Ferenc Szőke
- Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemical Engineering, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania
| | - Gabriella Stefánia Szabó
- Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemistry and Chemical Engineering of the Hungarian Line, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania
| | - Zoltán Hórvölgyi
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, Budafoki út 6-8, Budapest HU-1111, Hungary
| | - Emőke Albert
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, Budafoki út 6-8, Budapest HU-1111, Hungary
| | - Attila Gergely Végh
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári Krt. 62, Szeged H-6726, Hungary
| | - László Zimányi
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári Krt. 62, Szeged H-6726, Hungary
| | - Liana Maria Muresan
- Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemical Engineering, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania.
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