Determination of epoxy coating wet-adhesive strength using a standardized ASTM/ISO scratch test / Han Jiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 2 (03/2011) . - p. 255-263 Titre : Determination of epoxy coating wet-adhesive strength using a standardized ASTM/ISO scratch test Type de document : texte imprimé Auteurs : Han Jiang, Auteur ; Robert Browning, Auteur ; Peng Liu, Auteur ; T. A. Chang, Auteur ; Hung-Jue Sue, Auteur Année de publication : 2011 Article en page(s) : p. 255-263 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Eléments finis, Méthode des Epoxydes Essais (technologie) Rayures Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : A new approach for evaluating the wet-adhesive strength of epoxy-based coatings was carried out based on a recently standardized ASTM/ISO scratch test. A linearly increasing scratch normal load was applied during scratch to induce progressively increased delamination stress at the coating and steel substrate interface. Thus, the applied critical load to cause coating debonding can be experimentally determined. To find out the corresponding stress magnitude to incur coating debonding, finite element methods (FEM) modeling was conducted to analyze the stress fields around the scratch tip during scratching. The wet-adhesive strength is then quantitatively determined. Based on the above methodology, investigation on a set of model coating systems suggests that the critical load for coating delamination is significantly influenced by water exposure time, coating thickness, and substrate surface roughness. By combining the standardized scratch tests and FEM modeling, the proposed approach is found to be effective for quantitative assessment of epoxy coating wet-adhesive strength and for the development of high performance protective coatings for various industrial applications. Note de contenu : EXPERIMENTAL - Model coating systems - Sample water immersion conditioning - Determination of adhesive strength via scratch test - determination of critical load of coating debonding DETERMINATION OF COATING WET-ADHESIVE STRENGTH VIA FEM RESULTS AND DISCUSSION - Scratch test - Substrate surface roughness effect - Coating thickness effect - Coating wet-adhesive strength determination by FEM DOI : 10.1007/s11998-010-9296-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9296-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11413 [article]

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A glass-based protective coating on stainless steel for slab reheating application / Peng Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 1 (01/2011) . - p. 149-152 Titre : A glass-based protective coating on stainless steel for slab reheating application Type de document : texte imprimé Auteurs : Peng Liu, Auteur ; Lianqi Wei, Auteur ; Xun Zhou, Auteur ; Shufeng Ye, Auteur ; Yunfa Chen, Auteur Année de publication : 2011 Article en page(s) : p. 149-152 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Oxydation Revêtement métallique Revêtements protecteurs Verre Index. décimale : 667.9 Revêtements et enduits Résumé : A protective SiO2–Al2O3–Na2O glass-based coating for slab reheating application was deposited on AISI 304 stainless steel by air spraying, and its effect on high-temperature oxidation behavior of AISI 304 was investigated. Isothermal oxidation of bare and coated specimens was carried out at 1250°C in air. The results showed that the glass coating could markedly decrease weight gain of AISI 304 by 91.7% after exposure of 9 h, minimize high-temperature scaling, and enhance steel surface quality. The protective effect is attributed to the formation of molten glass layer on steel surface at high temperature, which acts as an effective oxygen diffusion barrier. This glass-based protective coating by low-cost and easily handling method is potentially applicable in a slab reheating process. DOI : 10.1007/s11998-010-9302-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9302-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10933 [article]

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Polyelectrolytes fabrication on magnesium alloy surface by layer-by-layer assembly technique with antiplatelet adhesion and antibacterial activities / Mengke Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 857-868 Titre : Polyelectrolytes fabrication on magnesium alloy surface by layer-by-layer assembly technique with antiplatelet adhesion and antibacterial activities Type de document : texte imprimé Auteurs : Mengke Peng, Auteur ; Xiaodan Zhang, Auteur ; Xiao Xiao, Auteur ; Mengjin Dong, Auteur ; Guowei Zhao, Auteur ; Peng Liu, Auteur ; Yashao Chen, Auteur ; Changhao Wang, Auteur Année de publication : 2019 Article en page(s) : p. 857-868 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion antiplaquettaire Antibactériens Anticorrosifs Anticorrosion Caractérisation Lysozyme Le lysozyme est une protéine globulaire formée de 129 acides aminés (chez l'être humain), que l'on rencontre dans un certain nombre de sécrétions (larmes, salive, lait maternel, mucus...) et dans le blanc d'Å“uf, chez de nombreuses espèces d'animaux, dont insectes et acariens1. Il s'agit d'une hydrolase acide (EC 3.2.1.17) sécrétée par les granulocytes et les monocytes. Elle détruit la paroi bactérienne en catalysant l'hydrolyse des peptidoglycanes la constituant. Magnésium -- Alliages Polyélectrolytes Polyéthylèneimine Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : Magnesium alloy (MgA) was widely used in biomedical field owing to its good biocompatibility and degradability. The surface of MgA was usually modified to improve its corrosion resistance, biocompatibility, and biological properties. Herein, we employed a layer-by-layer assembly technique to assemble both polyanionic and polycationic electrolytes onto the microarc oxidation-treated MgA surface to yield MgA-MgO-PEI-[Ge(HANPs)/Lzm]50, where the gelatin-conjugated hydroxyapatite nanoparticles [Ge(HANPs)] are the polyanionic electrolyte, lysozyme (Lzm) is the polycationic electrolyte, and polyethyleneimine (PEI) is the transition layer. The morphology and chemical composition of MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, indicating that [Ge(HANPs)/Lzm]50 were successfully fabricated on the surface of MgA-MgO. The surface of MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 exhibited good hydrophilicity as evidenced by the low water contact angle of 24.5°. Excellent corrosion resistance of MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 was obtained since it can decrease about four orders of magnitude of corrosive current (Icorr) compared to pristine MgA. The biological assay for MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 showed good antiplatelet adhesion and excellent antibacterial activities against both E. coli and S. aureus. Note de contenu : - EXPERIMENTAL : Materials - Preparation of hydroxyapatite nanoparticles (HANPs) - Preparation of MgA with MAO treatment (MgA-MgO - Preparation of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Characterizations for morphologies and composition - Water contact angle (WCA) measurement - Potentiodynamic polarization test - Antiplatelets adhesion assay - Antibacterial assay - Determination of release of lysozyme - RESULTS AND DISCUSSION : Morphology and phase structure of HANPs - Morphology and composition of different MgA samples - Hydrophilicity analysis of different MgA samples - Anticorrosive performance of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Antiplatelets adhesion assay of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Antibacterial assay of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Lysozyme release behavior of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 DOI : 10.1007/s11998-018-00162-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00162-6.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32597 [article]

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