Infrared-responsive shape memory self-healing and fluorescent damage-indication anti-corrosion coatings for aluminum alloys / Xue-qi Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1431-1446 Titre : Infrared-responsive shape memory self-healing and fluorescent damage-indication anti-corrosion coatings for aluminum alloys Type de document : texte imprimé Auteurs : Xue-qi Zhang, Auteur ; Rui Ding, Auteur ; Jie Xu, Auteur ; An-lan Ji, Auteur ; Yu-chen Zhang, Auteur ; Jie Fu, Auteur ; Xiao Lv, Auteur ; Lan Yao, Auteur ; Sheng-ying Yang, Auteur ; Qing-guo Mao, Auteur ; Xuan Liang, Auteur ; Jie Liu, Auteur ; Xiao Wang, Auteur Année de publication : 2024 Article en page(s) : p. 1431-1446 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Caractérisation Composites polymères Effet mémoire de forme Epoxydes Fluorescence Indication de dommages Métaux -- Revêtements protecteurs Revêtement autoréparant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Widely applied aluminum alloys in ship hulls, underwater vehicles, and marine machinery experience severe corrosion in harsh marine environments. For corrosion protection of aluminum alloys, the most convenient, effective, and low-cost approach was the application of anti-corrosion coatings. Coatings possessing self-healing properties to spontaneously repair damages have emerged as a research focus for new types of coatings. In this study, focused on the indication and repair of anti-corrosion coating damages for aluminum alloys, the fluorescent aggregation-induced emission (AIE) composite probe, rhodamine-naphthalimide (RNI), was synthesized, and the composite polymer materials HPPA-SMPU containing 2-hydroxyphosphinoyl carboxylic acid-doped polyaniline and shape memory polyurethane were prepared. Coaxial electrospinning technology was introduced to combine the two and create the fibrous materials with the fiber wall constructed from HPPA-SMPU, encapsulating the interior RNI solution. The fibers were incorporated into the epoxy coatings. RNI exhibited water-triggered AIE, Al3+-CHEF (chelation-enhanced fluorescence), and pH-responsive fluorescent properties to indicate infrared laser-targeted points of coating damages. The photothermal properties of HPPA-SMPU caused localized heating of the damaged coatings, reaching the phase transition temperature of epoxy and SMPU, leading to softening, expansion, shape memory behavior, and healing of the coating damages. The self-healing approaches enhanced the protective performance of the coatings for aluminum alloys, showcasing and extending the development of synergistic and intelligent functions in novel self-healing coating technologies. Note de contenu : - EXPERIMENTAL : Reagent description - Preparation of rhodamine naphthalimide - Preparation of 2-hydroxyphosphonyl carboxylic acid doped polyaniline (HPPA) - Preparation of photothermal shape memory composite polymer HPPA-SMPU - Preparation of electrospinning HPPA-SMPU@RNI core-sheath structure fiber - Preparation of HPPA-SMPU@RNI composite coatings - Characterization of material structure and morphology - Testing for fluorescence properties of RNI in response to coating damage - Evaluation of photothermal shape memory performance of HPPA-SMPU - Evaluation of photothermal self-healing performance of composite coatings - RESULTS AND DISCUSSION : Structural characterization of RNI and HPPA-SMPU - Characterization of HPPA-SMPU@RNI fibers - The fluorescence properties of RNI and its indication of coating damages - Photothermal shape memory performance of HPPA-SMPU - Photothermal self-healing behavior of composite coatings - Damage-indication and self-healing mechanism of coating damages DOI : https://doi.org/10.1007/s11998-023-000905-0 En ligne : https://drive.google.com/file/d/13z06vWc-NS6tpL__FToEg-SnEaAbffKf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41309 [article]

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Study of impedance model and water transport behavior of modified solvent-free epoxy anti-corrosion coating by EIS II / Rui Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 6 (11/2016) . - p. 981-997 Titre : Study of impedance model and water transport behavior of modified solvent-free epoxy anti-corrosion coating by EIS II Type de document : texte imprimé Auteurs : Rui Ding, Auteur ; Wei-wei Cong, Auteur ; Jian-ming Jiang, Auteur ; Tai-jiang Gui, Auteur Année de publication : 2016 Article en page(s) : p. 981-997 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosion Diffusion (physique) Eau Epoxydes Equation cinétique Métaux -- Revêtements protecteurs Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : This work studied the evolution of an impedance model of 60 μm modified solvent-free epoxy anti-corrosion coating on a Q235 steel surface in 3.5% NaCl solution using electrochemical impedance spectroscopy. The electrochemical process of the system was divided into five stages. During the early stage of immersion, water absorption occurred mainly at the coating, coating resistance decreased, and coating impedance deviated from purely capacitive characteristics. The corrosion reaction started after water permeated into the metal/coating interface. During the mid-immersion stage, the electrochemical reaction at the coating/metal interface was controlled by semi-infinite diffusion of corrosion products due to the barrier effect of the coating. The types of corrosion product diffusion gradually became finite layer diffusion and barrier layer diffusion with the clogging of coating pores. Logarithm of coating capacitance and the square root of time showed a linear relationship in the early immersion stage, which was a typical characteristic of Fick’s diffusion. Afterwards, increase in the coating capacitance slowed down, and a non-Fickian diffusion process occurred, which presented the two-stage absorption characteristics. Water diffusion coefficient in coating was calculated to be 2.95 × 10−10 cm2/s, while volume fraction and total water absorption at saturation of coating were 2.3% and 185 μg, respectively, indicating good water resistance and protective properties of the coating. The water kinetic equation in the coating which can reflect the whole Fick diffusion process of water and containing time and location variables was obtained via the Fick diffusion equation and three-dimensional images of water distribution in the coating were drawn by transforming the dynamic equation into programs. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Experimental materials and preparation of specimens - EIS measurement - RESULTS AND DISCUSSION : Evolution of impedance and equivalent circuit model (Initial water absorption - Occurrence of corrosion and impeded absorption - Warburg diffusion control - Finite layer diffusion control - Barrier layer diffusion control) - Water transport behavior in coating (Coating capacitance and water uptake - Absorbing kinetic equation) DOI : 10.1007/s11998-016-9810-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9810-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27245 [article]

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Study of impedance model and water transport behavior of modified solvent-free epoxy anticorrosion coating by EIS / Rui Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 501-515 Titre : Study of impedance model and water transport behavior of modified solvent-free epoxy anticorrosion coating by EIS Type de document : texte imprimé Auteurs : Rui Ding, Auteur ; Jianming Jiang, Auteur ; Taijiang Gui, Auteur Année de publication : 2016 Article en page(s) : p. 501-515 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Epoxydes Equation cinétique Humidité -- Absorption:Eau -- Absorption Métaux -- Revêtements protecteurs Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : This paper studies the evolution of impedance model of 30 μm solvent-free epoxy coating on Q235 steel surface in 3.5% NaCl solution using electrochemical impedance spectroscopy. The electrochemical process of the system was divided into five stages. Water absorption occurred at the coating mainly during the early stage of immersion. In the meantime, coating resistance became smaller and coating impedance deviated from purely capacitive characteristics. After water permeated into the metal/coating interface, corrosion reaction began. During the middle stage of immersion, due to the barrier effect of the coating, the electrochemical reaction at the coating/metal interface was controlled by diffusion of corrosion products. Since the coating prepared was relatively thin, transport distance was short for water, which could easily reach the coating/metal interface. During the middle-late stage of immersion, coating peeled off from the metal surface, diffusion of water molecules gradually turned to a macroscopic infiltration process, and the coating lost its protective effect. A logarithm of coating capacitance and the square root of time showed a linear relationship in the early immersion stage, which was a typical characteristic of Fick’s diffusion. Water diffusion coefficient in the coating was calculated to be 8.23 × 10−11 cm2/s, while volume fraction and total water absorption at saturation of coating were 3.5% and 105 μg/cm2, respectively, indicating good water resistance and protective properties of the coating. By solving the Fick’s diffusion equation, the kinetic equation which described the diffusion of water in the coating and included time and location variables were obtained. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Experimental materials and preparation of specimens - EIS measurement - RESULTS AND DISCUSSION : Evolution of impedance and equivalent circuit model - Water transport behavior in coating DOI : 10.1007/s11998-015-9769-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9769-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26290 [article]

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