Atomic force microscopy analysis of cathodic arc ion-plated CrN and CrC coatings / Kong Dejun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 781-787 Titre : Atomic force microscopy analysis of cathodic arc ion-plated CrN and CrC coatings Type de document : texte imprimé Auteurs : Kong Dejun, Auteur ; Zhu Shouyu, Auteur Année de publication : 2018 Article en page(s) : p. 781-787 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbure de chrome Nitrure de chrome Revêtement métallique Index. décimale : 667.9 Revêtements et enduits Résumé : Coatings of CrN and CrC were deposited on a YT14 cemented carbide cutting tool using cathodic arc ion plating (CAIP). The surface and interface morphologies of the as-obtained CrN and CrC coatings were analyzed using a field emission scanning electron microscope. The heights, particle diameters and power spectral densities of CrN and CrC coatings were analyzed using atomic force microscopy and the correlated parameters of roughness were obtained. The results show that the roughness of the CrN and CrC coatings is 81.7 × 10−3 and 70.2 × 10−3 nm, respectively, and CAIP has little effect on the CrN and CrC coating roughness. The height of the peak values of CrN and CrC coatings is 0.498 and 0.502 nm, respectively, and the reduction friction of the CrN coating was slightly better than that of the CrC coating. The average particle diameter of the CrN and CrC coatings is 6.575 × 102 and 7.678 × 102 nm, respectively, and the particles are uniformly distributed with no large-scale fluctuations. The power between the cursors of the CrN and CrC coatings is 1.44 × 10−2 and 9 × 10−3 nm2, respectively, with the power spectral density of the CrN coating being the dominant frequency. Note de contenu : - Surface and interface morphologies - Atomic force topographies - Height analysis - Analysis of particle diameters - Analysis of power spectra DOI : 10.1007/s11998-017-0034-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0034-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30856 [article]

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Novel multilayer structural epoxy composite coating containing graphene oxide and silanized chromium carbide for the protection of steel structures / Joseph Raj Xavier in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 6 (11/2022) . - p. 1713-1730 Titre : Novel multilayer structural epoxy composite coating containing graphene oxide and silanized chromium carbide for the protection of steel structures Type de document : texte imprimé Auteurs : Joseph Raj Xavier, Auteur Année de publication : 2022 Article en page(s) : p. 1713-1730 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. Anticorrosifs Anticorrosion Carbure de chrome Epoxydes Matériaux hybrides Métaux -- Revêtements protecteurs Nanoparticules Oxyde de graphène Revêtements organiques Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Nanocomposite coatings have been extensively used in the manufacture of automotive components to protect against corrosion of steel structures. The (3-mercaptopropyl) tris[2-(2-methoxyethoxy) ethoxy] silane (MPTMEES) functionalized Cr3C2 was encapsulated with graphene oxide (GO) as an efficient nanofiller in the epoxy matrix (EP). The silanized chromium carbide wrapped in graphene oxide was tested by SEM/EDX and TGA. Electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM) were used to study the protective performance of epoxy coating on steel in the presence of varying weight percentages of graphene oxide wrapped silanized chromium carbide in seawater. After 1 h of immersion, the coating resistance of EP-MPTMEES/Cr3C2 was determined to be over 43% higher than that of pure matrix. After 240 h in seawater, EIS tests revealed that EP-GO/MPTMEES-Cr3C2 nanocomposite coatings had a higher coating resistance (6340 kΩ.cm2) than ordinary epoxy (1.2 kΩ.cm2) coatings. Because of the coated substrate’s improved resistance to anodic dissipation, the least dissipation of ferrous ions was found at the crack of the EP-GO/MPTMEES-Cr3C2 nanocomposite coated steel specimen (1.5 I/nA). The silanized Cr3C2 was reinforced in the degradation products, forming an excellent passive layer at the coating/steel contact, according to FE-SEM/EDX analysis. The newly developed EP-GO/MPTMEES-Cr3C2 nanocomposite coating had improved corrosion protection and enhanced hydrophobic characteristics (WCA: 146°), according to the findings. The epoxy matrix with graphene oxide wrapped silanized chromium carbide demonstrated improved adhesive capabilities. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of GO anchored MPTMEES-Cr3C2 and EP-GO/MPTMEES-Cr3C nanocomposite - Characterization of GO/MPTMEES-Cr3C2 - Electrochemical investigation of coated specimen - Surface morphological studies - Mechanical properties - RESULTS AND DISCUSSION : Characterization of functionalized of Cr3C nanoparticles - Electrochemical investigation - XRD analysis - Water repellent properties - Mechanical properties - Proposed mechanism - Table 1 : The fitted results of EIS using equivalent circuit - Table 2 : Results of potentiodynamic polarization measurements - Table 3 : Mechanical properties of the nanocomposite films before and after immersion in several hours in natural seawater DOI : https://doi.org/10.1007/s11998-022-00643-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00643-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38492 [article]

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