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Square pulse current wave’s effect on electroplated nickel hardness
Efecto de la onda de corriente rectangular sobre la dureza de recubrimientos de níquel
DOI:
https://doi.org/10.15446/ing.investig.v26n3.14746Keywords:
square pulse current, hardness, electroplating, nickel (en)corriente pulsante, dureza, electro-depositación, níquel (es)
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The effects of frequency, average current density and duty cycle on the hardness of electroplated nickel were studied in Watts and sulphamate solutions by means of direct and square pulse current. The results in Watts’ solutions revealed greater hardness at low duty cycle, high average current density and high square pulse current frequency. There was little variation in hardness in nickel sulphamate solutions to changes in duty cycle and wave frequency. Hardness values obtained in the Watts’ bath with square pulse current were higher than those achieved with direct current at the same average current density; such difference was not significant in sulphamate bath treatment.
Se estudió el efecto de la frecuencia, la densidad de corriente promedio y el ciclo de trabajo sobre la dureza de electro-depósitos de níquel en soluciones Watts y sulfamato empleando pulsos de corriente rectangular y corriente directa. Los resultados en solución Watts muestran mayores durezas del depósito con bajos porcentajes de ciclo de trabajo, altas densidades de corriente promedio y altas frecuencias de la onda de corriente rectangular. La dureza de los depósitos obtenidos para la solución sulfamato de níquel presenta una variación poco signiticativa a cambios en el porcentaje del ciclo de trabajo y en la frecuencia del pulso de la onda de corriente. Los valores de dureza obtenidos para el baño Watts con ondas de corriente rectangular superan los valores alcanzados con corriente directa a las mismas densidades de corriente promedio. En el baño sulfamato esta diferencia no es significativa.
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Copyright (c) 2006 Bibian Alonso Hoyos, Luis Alberto Ossa, Monica Cecilia Rendón
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