Conferencias de la Universidad Nacional de Córdoba, Simposio Materiales y Tecnologías para la Industria Metalmecánica y Aeroespacial

Tamaño de fuente: 
MORPHOLOGICAL AND STRUCTURAL CHARACTERIZATION OF CHROMIUM FILMS OBTAINED ELECTROLYTICALLY FROM A TANNERY INDUSTRY EFFLUENT
Aline Marina Ortega Martínez, Joel Fuentes García, Gabriel Pineda Flores, Raúl Hernández Altamirano, Rubén Vázquez Medina, Ma del Carmen Monterrubio Badillo

Última modificación: 23-10-2016

Resumen


The wastewater from the tanning industry is characterized by a high pollution potential, because they contain organic matter and dissolved heavy metals like chromium. In order to achieve the elimination of these substances is necessary to implement specific treatment processes for contaminants. Especially, metals recovered can be reintegrated to the same process as raw material and/or to be reused in other process for different applications. The goal of this work was to recover chromium from a tannery industry effluent by using an electrochemical process, and to study the morphology and microstructure of the films obtained in order to be reused as corrosion protective film [1]. For this, a galvanostatic method was used where a current of 10 mA was applied at different times of deposition: 10, 20, 30, 40, 50 and 60 minutes, on stainless steel with a superficial area of  23.76 cm2. It is important to mention that organic matter was eliminated before electrochemical treatment by a biological process. The Cr concentration of the solution used was 0.86 mg/L determined by ICP-Plasma. The higher percentage of recovery was obtained at 60 minutes of deposition corresponding to 79%. Obtained films are composed by Cr and other non-identified compounds as showed in X-ray diffraction patterns. Agglomerates of chromium particles were observed by SEM with a size ranged between 25 and 50 mm and the deposit thickness of 62.5 mm, in the case of 20 minutes deposition time.


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