Documents disponibles écrits par cet auteur

Effect of surface substrate roughness and of chelating agent on the microstructure and mechanical properties of electroless processed brass coatings / Abel Hurtado-Macias in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6388-6393 Titre : Effect of surface substrate roughness and of chelating agent on the microstructure and mechanical properties of electroless processed brass coatings Type de document : texte imprimé Auteurs : Abel Hurtado-Macias, Auteur ; Carlos Dominguez-Rios, Auteur ; Juan Munoz-Saldana, Auteur Année de publication : 2010 Article en page(s) : pp. 6388-6393 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mechanical  properties  Microstructure  Chelating  agent  Roughness Résumé : Brass coatings were deposited by electroless process on zamak-5 alloy substrates with various degrees of polishing and different concentrations of chelating agent in the chemical baths, in which the Cu complexing agent was varied in a wide range of compositions. The effect of Rochelle salt content as well as the substrate roughness on the microstructure and mechanical properties of the prepared coatings was addressed. A two-layer structure is formed during the deposition process having stoichiometric composition corresponding to CuZn and Cu5Zn8 for the top and bottom layer, respectively, and also CuZn5 was detected. The CuZn stoichiometric top layer showed invariably higher hardness. Polishing of the substrate leads to coatings with coarse-grained microstructure and higher surface hardness. It is found that both the chelating agent and the substrate roughness influence the microstructure and mechanical properties of the coatings, and higher chelating agent concentrations and smoother substrates produce higher densities and therefore better mechanical properties. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23040393 [article] Effect of surface substrate roughness and of chelating agent on the microstructure and mechanical properties of electroless processed brass coatings [texte imprimé] / Abel Hurtado-Macias, Auteur ; Carlos Dominguez-Rios, Auteur ; Juan Munoz-Saldana, Auteur . - 2010 . - pp. 6388-6393. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6388-6393 Mots-clés : Mechanical  properties  Microstructure  Chelating  agent  Roughness Résumé : Brass coatings were deposited by electroless process on zamak-5 alloy substrates with various degrees of polishing and different concentrations of chelating agent in the chemical baths, in which the Cu complexing agent was varied in a wide range of compositions. The effect of Rochelle salt content as well as the substrate roughness on the microstructure and mechanical properties of the prepared coatings was addressed. A two-layer structure is formed during the deposition process having stoichiometric composition corresponding to CuZn and Cu5Zn8 for the top and bottom layer, respectively, and also CuZn5 was detected. The CuZn stoichiometric top layer showed invariably higher hardness. Polishing of the substrate leads to coatings with coarse-grained microstructure and higher surface hardness. It is found that both the chelating agent and the substrate roughness influence the microstructure and mechanical properties of the coatings, and higher chelating agent concentrations and smoother substrates produce higher densities and therefore better mechanical properties. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23040393

Influence of the conditions of zincate on the electroless brass plating of steel / Carlos Dominguez-Rios in Industrial & engineering chemistry research, Vol. 48 N° 8 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3837–3843 Titre : Influence of the conditions of zincate on the electroless brass plating of steel Type de document : texte imprimé Auteurs : Carlos Dominguez-Rios, Auteur ; Georgina Gardea-Hernández, Auteur ; Roal Torres-Sanchez, Auteur Année de publication : 2009 Article en page(s) : pp. 3837–3843 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Zinc  flash  Steel  Electroless  brass  plating Résumé : In this work, we report that zinc flash film must be applied on a substrate of steel in order to activate the surface for electroless brass plating and the effect of this layer on the final properties of brass film. It was established that the color of the brass film is highly dependent on the conditions of the application of the zinc flash. We found that the mechanism of electroless brass deposition begins with the partial dissolution of the zinc flash film. It was also found that a brass coating with good adhesion properties is obtained when the conditions of the zinc flash bath are as follows: current density of 10 A/dm2, immersion time of 30−45 s, and bath temperature of 40 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014445 [article] Influence of the conditions of zincate on the electroless brass plating of steel [texte imprimé] / Carlos Dominguez-Rios, Auteur ; Georgina Gardea-Hernández, Auteur ; Roal Torres-Sanchez, Auteur . - 2009 . - pp. 3837–3843. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3837–3843 Mots-clés : Zinc  flash  Steel  Electroless  brass  plating Résumé : In this work, we report that zinc flash film must be applied on a substrate of steel in order to activate the surface for electroless brass plating and the effect of this layer on the final properties of brass film. It was established that the color of the brass film is highly dependent on the conditions of the application of the zinc flash. We found that the mechanism of electroless brass deposition begins with the partial dissolution of the zinc flash film. It was also found that a brass coating with good adhesion properties is obtained when the conditions of the zinc flash bath are as follows: current density of 10 A/dm2, immersion time of 30−45 s, and bath temperature of 40 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014445

Measurement of mechanical properties of an electroless Ni – B coating using nanoindentation / Carlos Dominguez-Rios in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7762-7768 Titre : Measurement of mechanical properties of an electroless Ni – B coating using nanoindentation Type de document : texte imprimé Auteurs : Carlos Dominguez-Rios, Auteur ; Abel Hurtado-Macias, Auteur ; Roal Torres-Sanchez, Auteur Année de publication : 2012 Article en page(s) : pp. 7762-7768 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mechanical  properties Résumé : Structure and mechanical properties of electroless nickel-boride (Nt—B) thin film coatings on S7 steel substrate were studied in as-plated and annealed samples. The electroless bath does not contain Pb, Cd, or Ta in the stabilizer agents. The mechanical properties of the Ni—B coatings were obtained from nanoindentation measurements. Models by Korsusky and King were used to obtain hardness and elastic modulus, respectively. The structure of the coatings was observed by atomic force and scanning electron microscopy and XRD. Bath composition, plating time, annealing temperature, and time were considered in order to prepare coatings with optimal mechanical properties. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25968332 [article] Measurement of mechanical properties of an electroless Ni – B coating using nanoindentation [texte imprimé] / Carlos Dominguez-Rios, Auteur ; Abel Hurtado-Macias, Auteur ; Roal Torres-Sanchez, Auteur . - 2012 . - pp. 7762-7768. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7762-7768 Mots-clés : Mechanical  properties Résumé : Structure and mechanical properties of electroless nickel-boride (Nt—B) thin film coatings on S7 steel substrate were studied in as-plated and annealed samples. The electroless bath does not contain Pb, Cd, or Ta in the stabilizer agents. The mechanical properties of the Ni—B coatings were obtained from nanoindentation measurements. Models by Korsusky and King were used to obtain hardness and elastic modulus, respectively. The structure of the coatings was observed by atomic force and scanning electron microscopy and XRD. Bath composition, plating time, annealing temperature, and time were considered in order to prepare coatings with optimal mechanical properties. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25968332