Comparison of corrosion performance of various conversion coatings on magnesium alloy using electrochemical techniques / R. Uma Rani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 5 (09/2013) . - p. 707-715 Titre : Comparison of corrosion performance of various conversion coatings on magnesium alloy using electrochemical techniques Type de document : texte imprimé Auteurs : R. Uma Rani, Auteur ; V. Maria Shalini, Auteur ; Hari Krishna Thota, Auteur ; A. K. Sharma, Auteur Année de publication : 2013 Article en page(s) : p. 707-715 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Magnésium -- Alliages Polarisation (électricité) Revêtements:Peinture Spectroscopie d'impédance électrochimique Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Comparative studies on some of the important chemical conversion coatings, namely, phosphate–permanganate, galvanic black anodizing, dichromate treatment, and micro arc oxidized and modified acid fluoride anodizing on magnesium alloy AZ31B have been conducted. The surface morphology and composition of the coatings were examined through SEM and EDX techniques. Corrosion resistances of these coatings were compared using electrochemical impedance spectroscopy (EIS) and linear polarization studies. The corrosion resistances of the coatings investigated were found to be according to the order as follows: modified acid fluoride > micro arc oxidized phosphate > micro arc oxidized silicate > dichromate > galvanic black anodizing > phosphate-permanganate > bare magnesium. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - Characterization of the coating - RESULTS AND DISCUSSION : Corrosion studies DOI : 10.1007/s11998-012-9466-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9466-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19804 [article]

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Electrodeposited nickel-phosphorus (Ni-P) alloy coating : an in-depth study of its preparation, properties and structural transitions / Anju M. Pillai in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 6 (11/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 6 (11/2012) . - p. 785-797 Titre : Electrodeposited nickel-phosphorus (Ni-P) alloy coating : an in-depth study of its preparation, properties and structural transitions Type de document : texte imprimé Auteurs : Anju M. Pillai, Auteur ; A. Rajendra, Auteur ; A. K. Sharma, Auteur Année de publication : 2012 Article en page(s) : p. 785-797 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages nickel-phosphore Dépôt électrolytique Microstructures Nanoindentation Revêtement métallique Traitement thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Ni-P deposits with a phosphorus content of up to 20% (wt) were obtained on AA6061 substrates by direct current electrodeposition technique from a solution containing nickel sulfate, nickel chloride, phosphorous acid, phosphoric acid, and a wetting ageng (sodium lauryl sulfate). The effect of various plating parameters like current density, concentration of phosphorous acid, concentration of phosphoric acid and plating temperature on the P content of the coating as well as the rate of deposition was investigated systematically. It has been observed that the influence of current density on the P content of the deposit is largely dependent on the concentration of phosphorous acid in the plating bath. Composition, surface morphology, microstructure, and mechanical properties of the Ni-P deposits were studied using SEM, EDAX, XRD, and nanoindentation techniques. Ni-P electrodeposits with low P ocntent in the range of 4è7 wt% of P exhibited superior microhardness of 7.74-8.57 GPa. With increasing P content in the deposit, the structure undergoes transition from crystalline to nanocrystalline and becomes amorphous above 9.14 wt% of P. Ni-P alloys with some selected compositions were subjected to heat treatment at 400°C for 1h in a hot air oven and the resulting variation in mechanical properties was studied using nanoindentation technique. Note de contenu : - Appearance - Effect of plating parameters - Effect of P content on the surface morphology of the coating - Effect of P content on the microstructure of the coating - Influence of plating parameters on the mechanical properties of the deposit - Effect of heat treatment on the microstructure of the coating - Effect of heat treatment on mechanical properties DOI : 10.1007/s11998-012-9411-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9411-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16664 [article]

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