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Dimethyl secondary amine chain extenders : a conceptual approach to in situ generation of advanced epoxy resins for rapid-cure, low-VOC coatings / Frederick H. Walker in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 283-313 Titre : Dimethyl secondary amine chain extenders : a conceptual approach to in situ generation of advanced epoxy resins for rapid-cure, low-VOC coatings Type de document : texte imprimé Auteurs : Frederick H. Walker, Auteur ; Rob Rasing, Auteur ; Gamini A. Vedage, Auteur ; Michael Cook, Auteur Année de publication : 2009 Article en page(s) : p. 283-313 Note générale : Bibliogr. Langues : Américain (ame) Tags : Poly(N-methylazetidine)  Dimethyl-meta-xylylenediamine  Pseudo-first-order  kinetic  Amine  reactivity  epoxy  curing  agent  Epoxy  resin  coating  Flexibility  Crosslink  density  Miller-Macosko  calculation  Chain  extender  VOC  Low  temperature  cure  Environmental  movement  Electrochemical  impedance  Aine  reaction  mechanism  Mannich  base Index. décimale : 667.9 Revêtements et enduits Résumé : Advanced epoxy resin oligomers have traditionally been utilized for coatings that combine fast dry-to-touch speed and good flexibility--properties demanded in many markets such as marine and industrial maintenance coatings. Unfortunately, advanced epoxy resins require formulation with large quantities of solvent that make attainment of modern VOC regulations difficult or impossible. Coatings formulated from low molecular weight liquid epoxy resin, on the other hand, can easier meet VOC challenges, but dry slowly and tend to be brittle. This presentation explores the concept of using fast reacting, di-functional amine chain extenders to generate epoxy oligomers in situ as a means to meet these opposing property demands. Methylamine-terminated poly-(N-methylazetidine) (pNMAz, 1) is prepared in a two-step process involving the Michael addition of methylamine to acrylonitrile, followed by hydrogenation in a methylamine-containing atmosphere to yield an oligomer stream with an [M.sub.n] of about 250. Competitive pseudo-first-order kinetic measurements conducted in isopropyl alcohol indicate methyl-substituted disecondary diamines reacted approximately 3 to 3.6 times faster with phenyl glycidyl ether (PGE) than the primary amine meta-xylylenediamine (MXDA). These chain extenders can be formulated with traditional multi-functional amine crosslinkers to yield coatings with lower VOC, faster dry speed, and better flexibility compared to corresponding coatings formulated without the chain extender. DOI : 10.1007/s11998-009-9178-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9178-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6111 [article]

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Confocal Raman microscopy study of the melamine distribution in polyester–melamine coil coating / Wanrui Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 315-328 Titre : Confocal Raman microscopy study of the melamine distribution in polyester–melamine coil coating Type de document : texte imprimé Auteurs : Wanrui Zhang, Auteur ; Chris Lowe, Auteur ; Ray Smith, Auteur Année de publication : 2009 Article en page(s) : p. 315-328 Note générale : Bibliogr. Langues : Américain (ame) Tags : Coil  coating  Melamine  enrichment  Confocal  Raman  microscopyhttp://download.springer.com/static/pdf/925/art%253A10.1007%252Fs11998-008-9136-2.pdf?originUrl=http%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%2Fs11998-008-9136-2&token2=exp=1464962484~acl=%2Fstatic%2Fpdf%2F925%2Fart%25253A10.1007%25252Fs11998-008-913 Index. décimale : 667.9 Revêtements et enduits Résumé : Hexamethoxymethylmelamine, a common crosslinker used in combination with polyester resins to prepare thermosetting coatings, can self-condense during curing and in theory build up regions with high crosslink density (melamine enrichment). This distribution may affect such properties as the "local" glass transition temperature and structural heterogeneity and thereby modify formability, stain resistance, and weatherability. The self-condensation regions have not previously been observed in detail so their distribution in the film is unclear. Confocal Raman microscopy (CRM) has been used to characterize the melamine distribution in three polyester–melamine paint systems: one clear and two pigmented coil coatings. Both the surface mapping and depth profiling features of CRM were used to perform a 3D analysis. The depth profiling of the clear coating was performed in a nondestructive way, but due to the opaque nature of the pigments, cross sections of the pigmented coatings were prepared in order to facilitate the analysis of the melamine distribution through the film thickness. Melamine-enriched zones were found on the surfaces of all three samples. They appeared to be approximately spherical with diameters of around 5 µm. It was also observed from the cross sections that the melamine-enriched zones appeared as "particles" distributed randomly through the coating. The Raman spectra collected at these regions show significantly higher triazine ring band intensity. All of these findings confirm the hypotheses constructed over the past 20–30 years. DOI : 10.1007/s11998-008-9136-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9136-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6112 [article]

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The effect of difunctional acids on the performance properties of polyurethane coatings / Shailja Awasthi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 329-335 Titre : The effect of difunctional acids on the performance properties of polyurethane coatings Type de document : texte imprimé Auteurs : Shailja Awasthi, Auteur ; Devendra Agarwal, Auteur Année de publication : 2009 Article en page(s) : p. 329-335 Note générale : Bibliogr. Langues : Américain (ame) Tags : Polyurethane  coating  Aromatic  Linear  diacids  Cycloaliphatic  compounds  Isocyanate  trimer Index. décimale : 667.9 Revêtements et enduits Résumé : Hydroxyl-terminated polyesters are the most common polyols that are crosslinked through an isocyanate group. In this study, the polyester polyol resins were synthesized by using 1,4-cyclohexanedimethanol (1,4-CHDM) with the mixture of different diacids as 1,3-cyclohexanedicarboxylicacid (1,3-CHDA), 1,4-cyclohexanedicarboxylicacid (1,4-CHDA), isophthalic acid (IPA), adipic acid (AA), and azelaic acid (AZA). The solubility and viscosity of these polyester polyol resins were determined by using suitable solvent. All the polyester polyols were crosslinked with HDI isocyanurate and IPDI trimer to form polyurethane coating films. These films were evaluated for their mechanical, thermal, and chemical resistance properties. The studies on film characteristics reveal that the cycloaliphatic diacids afforded polyurethane with greater performance properties than that of aromatic and linear aliphatic diacids. DOI : 10.1007/s11998-008-9121-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9121-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6113 [article]

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Synthesis and structural characterization of urea–isobutyraldehyde–formaldehyde resins / Yi-fu Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 337-344 Titre : Synthesis and structural characterization of urea–isobutyraldehyde–formaldehyde resins Type de document : texte imprimé Auteurs : Yi-fu Zhang, Auteur ; Bi-ye Ren, Auteur ; Xing-rong Zeng, Auteur Année de publication : 2009 Article en page(s) : p. 337-344 Note générale : Bibliogr. Langues : Américain (ame) Tags : Urea  Isobutyraldehyde  Formaldehyde  Resin  Structure  Characterization Index. décimale : 667.9 Revêtements et enduits Résumé : Urea–isobutyraldehyde–formaldehyde (UIF) resins were synthesized using urea, isobutyraldehyde, and formaldehyde; sulfuric acid was used as a catalyst. The effects of molar ratio of urea/isobutyraldehyde/formaldehyde (U/I/F) on the properties of resins were investigated, and the structures of the resins were characterized by FTIR, 1H-NMR, and 13C-NMR. When U/I/F was 1.0/3.6/2.4, the yield of the resin was 76.5 %. The softening point and hydroxyl value were 90°C and 32 mg KOH/g, respectively. The FTIR, 1H-NMR, and 13C-NMR results showed that an a-ureidoalkylation reaction occurred between urea and isobutyraldehyde to form a lactam. The UIF resins also contained hydroxyl groups and aldehyde groups; the content of aldehyde groups in the resin increased as the amount of isobutyraldehyde increased. DOI : 10.1007/s11998-008-9126-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9126-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6114 [article]

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Study of self-stratifying compositions / Helena Kuczynska in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 345-352 Titre : Study of self-stratifying compositions Type de document : texte imprimé Auteurs : Helena Kuczynska, Auteur ; Ewa Langer, Auteur ; Elzbieta Kaminska-Tarnawska, Auteur ; Dmitry A. Kulikov, Auteur ; Eugene A. Indeikin, Auteur Année de publication : 2009 Article en page(s) : p. 345-352 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Revêtements autostratifiants:Peinture autostratifiante Séparation (technologie) Solubilité Index. décimale : 667.9 Revêtements et enduits Résumé : Paint applied as a single layer, and its spontaneous separation to form a primer and a top coat, is one of the newest concepts of the effective and economical application of two layers in one step. The influence of the molecular weight of epoxy oligomer and acrylic polymer and their ratio on self-stratification was investigated. The degree of stratification depending on molecular weight and their mutual ratio was determined using ATR-FTIR spectroscopy, differential scanning calorimetry, microscopy techniques, adhesion tests, and surface tension measurements. Phase separation and self-stratification of two-component homogenous mixtures were followed using FTIR technique and surface tension measurements. As a result of these investigations, optimal oligomeric/polymeric composition was selected. The obtained coating system showed good mechanical properties, gloss, and interlayer adhesion. DOI : 10.1007/s11998-008-9148-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9148-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6115 [article]

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Effect of nano-Al2O3 particles on the corrosion behavior of alkyd based waterborne coatings / Shailesh K. Dhoke in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p.353-368 Titre : Effect of nano-Al2O3 particles on the corrosion behavior of alkyd based waterborne coatings Type de document : texte imprimé Auteurs : Shailesh K. Dhoke, Auteur ; T. Jai Mangal Sinha, Auteur ; A. S. Khanna Année de publication : 2009 Article en page(s) : p.353-368 Note générale : Bibliogr. Langues : Américain (ame) Tags : Waterborne  coatings  Nano-Al2O3  Corrosion  resistance  UV Index. décimale : 667.9 Revêtements et enduits Résumé : A modification in the alkyd based waterborne coatings was studied with the addition of 0.05%, 0.1%, 0.2%, and 0.3% nano-Al2O3. Corrosion performance of the nano-composite coatings were evaluated by applying these nanocomposites on mild steel substrate and exposing them to salt spray, humidity, and accelerated weathering. Mechanical properties were studied by subjecting the coating to scratch and abrasion test. The results showed that, with an increase in the concentration of nano-Al2O3 there was an improvement in the corrosion resistance, UV resistance, and mechanical properties of the coatings indicating the positive effect of addition of nano-Al2O3 particles in the coatings. Further, the transparency of the coating was not altered, maintaining the optical clarity of the coating. DOI : 10.1007/s11998-008-9127-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9127-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6116 [article]

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Zinc hypophosphite : a suitable additive for anticorrosive paints to promote pigments synergism / C. Deyà in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 369-376 Titre : Zinc hypophosphite : a suitable additive for anticorrosive paints to promote pigments synergism Type de document : texte imprimé Auteurs : C. Deyà, Auteur ; G. Blustein, Auteur ; R. Romagnoli, Auteur ; Beatriz del Amo, Auteur Année de publication : 2009 Article en page(s) : p. 369-376 Note générale : Bibliogr. Langues : Américain (ame) Tags : Anticorrosive  paints  Electrochemical  tests  Phosphate  pigments  Zinc  hypophosphite Index. décimale : 667.9 Revêtements et enduits Résumé : In this investigation, the synergism promoted by zinc hypophosphite in an anticorrosive pigment mixture is reported. This paper describes the anticorrosive behavior of a commercial pigment mixture containing zinc hypophosphite, reduced levels of zinc phosphate, and zinc oxide. The anticorrosive performance of the pigment mixture was assessed by electrochemical techniques (corrosion potential and linear polarization measurements) employing pigment suspensions. The behavior of each separate component of the mixture was also studied in the same way. The nature of the protective layer was investigated by scanning electron microscopy (SEM). In a second stage, the anticorrosive properties of the pigment were assessed by incorporating it into alkyd and epoxy paints that were evaluated by accelerated (salt spray and humidity tests) and electrochemical measurements. Experimental results showed that improved anticorrosion protection is achieved in paints with reduced zinc phosphate contents as a consequence of the synergistic interaction between zinc hypophosphite and the other components of the pigment mixture. DOI : 10.1007/s11998-008-9147-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9147-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6117 [article]

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Design and characteristic analysis of a new nozzle for preparing microencapsulated particles by RESS / Ya-qing Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 377-382 Titre : Design and characteristic analysis of a new nozzle for preparing microencapsulated particles by RESS Type de document : texte imprimé Auteurs : Ya-qing Liu, Auteur ; Gui-zhe Zhao, Auteur ; You-yi Sun, Auteur ; Fa-Xing Zhang, Auteur ; Li Xiao-ying, Auteur Année de publication : 2009 Article en page(s) : p. 377-382 Note générale : Bibliogr. Langues : Américain (ame) Tags : RESS  Microcapsule  Design  of  nozzle  Technology  coating  Red  phosphorus Index. décimale : 667.9 Revêtements et enduits Résumé : A new nozzle was designed for the technology of making microencapsulated particles by rapid expansion of supercritical solution (RESS). The design is based on the theory of gas dynamics in which the potential energy of high stagnation pressure is converted totally into effective velocity energy. Therefore, a high momentum of the exit jet can be obtained for improving the capability of removing molten debris quickly. Furthermore, the microencapsulated red phosphorus particles were prepared by RESS with the new nozzle, and the structure and property of the microencapsulated red phosphorus particles were characterized by the SEM images, droplet concentration distributions, and moisture absorption ratio. The results show that the process can effectively encapsulate the red phosphorus particles with the paraffin. DOI : 10.1007/s11998-008-9145-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9145-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6118 [article]

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Microstructure analyses and thermophysical properties of nanostructured thermal barrier coatings / Hong Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 383-390 Titre : Microstructure analyses and thermophysical properties of nanostructured thermal barrier coatings Type de document : texte imprimé Auteurs : Hong Zhou, Auteur ; Fei Li, Auteur ; Bao-de Sun, Auteur Année de publication : 2009 Article en page(s) : p. 383-390 Note générale : Bibliogr. Langues : Américain (ame) Tags : Air  plasma  spray  Thermal  barrier  coatings  Microstructure  conductivity Index. décimale : 667.9 Revêtements et enduits Résumé : Nanostructured 8 wt% yttria partially stabilized zirconia coatings were deposited by air plasma spraying. Transmission electron microscopy, scanning electron microscopy, and X-ray diffraction were carried out to analyze the as-sprayed coatings and powders. Mercury intrusion porosimetry was applied to analyze the pore size distribution. Laser flash technique and differential scanning calorimetry were used to examine the thermophysical properties of the nanostructured coatings. The results demonstrate that the as-sprayed nanostructured zirconia coatings consist of the nonequilibrium tetragonal phase. The microstructure of the nanostructured coatings includes the initial nanostructure of powder and columnar grains. Moreover, micron-sized equiaxed grains were also exhibited in the nanostructured coatings. Their evolution mechanisms are discussed. The as-sprayed nanostructured zirconia coating shows a bimodal pore size distribution, and has a lower value of thermal conductivity than the conventional coating. DOI : 10.1007/s11998-008-9138-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9138-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6119 [article]

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Electrodeposition behavior of zinc–nickel–iron alloys from sulfate bath / Mortaga M. Abou-Krisha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 391-399 Titre : Electrodeposition behavior of zinc–nickel–iron alloys from sulfate bath Type de document : texte imprimé Auteurs : Mortaga M. Abou-Krisha, Auteur ; S. A. El-Naby, Auteur ; F. H. Assaf, Auteur Année de publication : 2009 Article en page(s) : p. 391-399 Note générale : Bibliogr. Langues : Américain (ame) Tags : Electrodeposition  Phase  structure  Surface  morphology  Corrosion  resistance  Ternary  Zn–Ni–Fe  alloy Index. décimale : 667.9 Revêtements et enduits Résumé : The present work is directed at collecting the properties of Zn–Ni and Zn–Fe alloys in one alloy via the electrodeposition of Zn–Ni–Fe ternary alloy. Electrodeposition of ternary Zn–Ni–Fe alloy was investigated and compared with the characteristics of Zn–Ni electrodeposits. The electrodeposition was performed from a sulfate bath onto a steel substrate. Structural analysis by X-ray diffraction (XRD) method revealed that the Zn–Ni–Fe alloys consisted of a mixture of zinc, and (gamma-Ni2Zn11) and (Fe3Ni2) phases. The study was carried out using electrochemical methods such as cyclic voltammetry and galvanostatic for electrodeposition, while anodic linear polarization resistance and anodic linear sweeping voltammetry techniques were used for the corrosion study. Surface morphology and chemical composition of the deposits were also examined by using scanning electron microscopy and atomic absorption spectroscopy, respectively. It was found that the obtained Zn–Ni–Fe alloy exhibited more preferred surface appearance and better corrosion resistance without adding any organic brighteners to the plating bath in comparison to Zn–Ni alloy that electrodeposited at similar conditions. Results obtained revealed that the increase in corrosion resistance of ternary deposits is not only attributed to the formation of (gamma-Ni2Zn11) phase, but also to iron codeposition and formation of (Fe3Ni2) phase. DOI : 10.1007/s11998-008-9134-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9134-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6120 [article]

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Effect of heat treatment on microstructure and mechanical properties of cold sprayed Ti coatings with relatively large powder particles / W.-Y. Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 401-406 Titre : Effect of heat treatment on microstructure and mechanical properties of cold sprayed Ti coatings with relatively large powder particles Type de document : texte imprimé Auteurs : W.-Y. Li, Auteur ; C. Zhang, Auteur ; H. Liao, Auteur ; C. Coddet, Auteur Année de publication : 2009 Article en page(s) : p. 401-406 Note générale : Bibliogr. Langues : Américain (ame) Tags : Cold  spraying  Vacuum  heat  treatment  Titanium  Microstructure  Microhardness  Adhesive  strength Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the effect of post-spray heat treatment on the microstructure, microhardness, and adhesive strength of the cold-sprayed Ti coating was investigated. It was found that a thick and relatively porous Ti coating was deposited by cold spraying. The coating surface layer presented a more porous structure. The microhardness of the as-sprayed Ti coating was slightly higher compared to pure Ti bulk, owing to the work hardening effect during deposition. After annealing at 850°C for 4 h under vacuum condition, the Ti coating also presented a porous structure with more uniformly distributed small pores. A metallurgical bonding between the deposited particles was formed through annealing treatment. The adhesive strength of coating was significantly improved after annealing. The microhardness of the annealed Ti coating was also increased. DOI : 10.1007/s11998-008-9133-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9133-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6121 [article]

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Improvement of the properties of AZ91D magnesium alloy by treatment with a molten AlCl3–NaCl salt to form an Mg–Al intermetallic surface layer / Meifeng He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 407-411 Titre : Improvement of the properties of AZ91D magnesium alloy by treatment with a molten AlCl3–NaCl salt to form an Mg–Al intermetallic surface layer Type de document : texte imprimé Auteurs : Meifeng He, Auteur ; Lei Liu, Auteur ; Yating Wu, Auteur ; Zhixin Tang, Auteur ; Wenbin Hu, Auteur Année de publication : 2009 Article en page(s) : p. 407-411 Note générale : Bibliogr. Langues : Américain (ame) Tags : Magnesium  alloy  Intermetallic  compounds  Coatings  Corrosion Index. décimale : 667.9 Revêtements et enduits Résumé : A process for surface modification of AZ91D magnesium alloy has been carried out in AlCl3–NaCl molten salts melt at 573 K for 7 h. The process was used to form a diffusion alloying layer on the surface of the sample to improve corrosion resistance. The diffusion alloying layer was mainly composed of Mg–Al intermetallic compounds. The continued immersion test in 5% NaCl solutions displayed that molten salt diffusion-treated specimen had better corrosion resistance compared to the untreated AZ91D specimen. The polarization test indicated that the Mg–Al intermetallic compounds of the layer were an effective corrosion barrier to decrease the corrosion rate for AZ91D magnesium alloy when exposed to 3.5% NaCl solutions. The microhardness values of the Mg–Al intermetallic compounds were higher than those of the substrate. DOI : 10.1007/s11998-008-9132-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9132-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6122 [article]

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Solid-state reactions of silicon carbide and chemical vapor deposited niobium / Wang Yiguang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 413-417 Titre : Solid-state reactions of silicon carbide and chemical vapor deposited niobium Type de document : texte imprimé Auteurs : Wang Yiguang, Auteur ; Liu Qiaomu, Auteur ; Litong Zhang, Auteur ; Laifei Cheng, Auteur Année de publication : 2009 Article en page(s) : p. 413-417 Note générale : Bibliogr. Langues : Américain (ame) Tags : Chemical  vapor  deposition  Thermodynamics  Solid-state  reactions  Niobium  Silicon  carbide Index. décimale : 667.9 Revêtements et enduits Résumé : Niobium films were deposited on silicon carbide by chemical vapor deposition using niobium chloride and hydrogen at a temperature range of 900–1300°C. The solid-state reactions between the deposited niobium and silicon carbide matrix were studied by examining the obtained films using X-ray diffraction and energy dispersion spectroscopy. The results indicated that niobium silicides could be formed at the beginning, which blocked further reactions between carbon and niobium to form niobium carbides. When the deposition temperature was increased, silicon would diffuse outward, which allowed the formation of niobium carbides. The reaction process and mechanism are discussed based on the thermodynamics and kinetics. DOI : 10.1007/s11998-008-9129-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9129-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6123 [article]

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