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      Desarrollo de un recubrimiento electrolítico estaño-cobalto alternativo mediante la aplicación de técnicas de manipulación de corriente

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          Abstract

          En el presente trabajo se presenta el desarrollo de un recubrimiento electrolítico Estaño-Cobalto con excelentes propiedades decorativas, aplicando las técnicas de manipulación de corriente, sin baños de elevada toxicidad ambiental. Se determinó que a un pH 8, temperatura de 60ºC, densidad de corriente promedio de 2 A/dm2, densidad de corriente catódica de 14 A/dm2 y un tiempo de encendido de 4 ms y de apagado de 24 ms con un ciclo duty de 14.28% se obtiene la mejor calidad estética del recubrimiento, la cual está caracterizada por un brillo de 22.8 y una rugosidad media Ra 0.27 μm y Rz 1.9 μm, teniendo un poder nivelante de 70.5% en comparación al sustrato. De igual forma, el electrodepósito presenta una resistencia eléctrica de poro sobre cobre de 2.363 K_.Cm2 y un potencial de corrosión de -323.2 mV. Con la corriente pulso se observó por microscopia electrónica que favorece la nucleación entre pulsos,produciendo depósitos con propiedades superiores a las obtenidas con corriente continua, sin necesidad de aditivos abrillantadores y contaminantes. Mediante el análisis de energía electrodispersiva se pudo establecer para la composición química de los electrodepósitos obtenidos, una relación molar aproximada de Sn-Co en 1:1.

          Translated abstract

          DEVELOPMENT OF AN ELECTROLYTIC COATING TIN-COBALT ALLOY PLATING ALTERNATIVE BY TECHNIQUES OF CURRENT MODULATION Abstract: To study and evaluate the plating conditions and processes for preparation of tin-cobalt alloys, an alternative coating current modulation technique was used. As a result, it was found that the surface plating is optimal when it was plated under a duty cycle of 14.28%. A peak pulsed current density of 14 A/dm2 is required for an average current density of 2 A/dm2 with a solution temperature of 50oC at pH 8. The effect of pulsed current plating upon the structure of the deposits from a pyrophosphate baths, without additives, has confirmed an increase in brightness, reduction in grain size and a progressive transition of structure from columnar to lamellar. The use of pulse current plating parameters that result in grain refinement will also lead to a reduction in porosity of the deposits, as compared with constant current plating. Scanning electronic micrographs show that it is possible obtain more uniform tin-cobalt alloys deposits by pulsed plating. The analysis by EDX showed that the composition of the tin-cobalt alloy and the molar ratio was 1: 1.

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          Most cited references7

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          Materials Science Forum

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            D 523-67, Standard Method of Test For Specular Gloss

            (2024)
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              Teoric and Practice of Pulsed Plating

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                Author and article information

                Journal
                uct
                Universidad, Ciencia y Tecnología
                uct
                AutanaBooks S.A.S. Revista de la Universidad Experimental Politécnica Antonio José de Sucre, Vice Rectorado Puerto Ordaz, Venezuela, gestionada en Ecuador por AutanaBooks (Quito, Pichincha, Ecuador )
                1316-4821
                2542-3401
                July 2007
                : 11
                : 43
                : 071-078
                Affiliations
                [01] Puerto Ordaz Bolívar orgnameUnexpo orgdiv1Dpto. de Estudios Generales orgdiv2Sección de Química Venezuela
                [02] orgnameUnexpo orgdiv1Postgrado hernandez@ 123456cantv,net
                Article
                S1316-48212007000200003 S1316-4821(07)01104303
                718c7918-b3e3-4849-93c3-9478f61130bc

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 24 October 2006
                : 29 May 2007
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 8, Pages: 8
                Product

                SciELO Venezuela

                Categories
                ELECTRODEPOSICION

                Current Modulation,Electroplating,Tin-Cobalt Alloy Plating,Corriente pulso,Manipulación de corriente,Electrodeposición,Current ulsing

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