The electrodeposition of the ternary alloy coating of Zn -Ni- Co using a solution containing zinc chloride ( ZnCl2 ) , cobalt chloride ( CoCl2.6H2O ) and nickel chloride ( NiCl2.6H2O ) . The crystalline phase , surface morphology and hardness of the alloys obtained were characterized by X-ray diffraction (XRD ) , atomic force microscopy (AFM) and microhardness , respectively . The chemical composition of the coating was measured by atomic absorption spectroscopy . The corrosion rate was measured with a potentiostat through the technique of linear polarization resistance . We found that the ternary alloys obtained have better corrosion resistance and higher hardness than the Zn coating . Under the conditions examined , the electrodeposition of ternary coating is the anomalous type . The crystalline phase of the alloy obtained on ordinary steel and copper is Zn11Ni2 phase .

The electrodeposition of the ternary alloy coating of Zn -Ni- Co using a solution containing zinc chloride ( ZnCl2 ) , cobalt chloride ( CoCl2.6H2O ) and nickel chloride ( NiCl2.6H2O ) . The crystalline phase , surface morphology and hardness of the alloys obtained were characterized by X-ray diffraction (XRD ) , atomic force microscopy (AFM) and microhardness , respectively . The chemical composition of the coating was measured by atomic absorption spectroscopy . The corrosion rate was measured with a potentiostat through the technique of linear polarization resistance . We found that the ternary alloys obtained have better corrosion resistance and higher hardness than the Zn coating . Under the conditions examined , the electrodeposition of ternary coating is the anomalous type . The crystalline phase of the alloy obtained on ordinary steel and copper is Zn11Ni2 phase .

  The research in the laboratory was made operating variables (reactant concentration, pH and oxidation potential) of pyrite leaching gold from river Tablachaca (Ancash Peru) with thiourea (TU) followed by electro-deposition of gold. The experimental study was conducted in three stages: Oxidation of thiourea leaching of gold and gold electroplating. As an alternative to chemical agents, TU oxidation via electrolysis was conducted to obtain formamidine disulphide (FDS), which serves as an oxidizer in the dissolution of gold. The optimum degree of conversion of formamidine disulfide thiourea in 2.5 h was obtained by applying a FEM of 4.5 V with a pH of 1.5. The anodic and cathodic compartments of the electrochemical reactor were separated by an anion membrane with the purpose of eliminating undesired reactions at the cathode. Prior to the leaching step, the mineral was washed with sul...

Se investigó a nivel de laboratorio las variables de operación (concentración de reactivos, pH y potencial de oxidación) del proceso de lixiviación de piritas auríferas procedentes de río Tablachaca (Ancash Perú) con Tiourea (TU) seguido de electro-deposición de oro. El estudio experimental, se desarrolló en tres etapas: Oxidación de Tiourea, Lixiviación de oro y Electro-deposición de oro. Como una alternativa a los agentes químicos, la oxidación de TU se realizó vía electrólisis para producir Disulfuro Formamidina (FDS), el cual, sirve como oxidante en la disolución de oro. El grado de conversión óptima de tiourea a disulfuro formamidina se obtiene en 2,5 h aplicando una FEM de 4,5 V con un pH igual 1,5. Los compartimientos anódico y catódico del reactor electroquímico fueron separados por una membrana aniónica con la finalidad de eliminar reacciones indeseables...

  The research in the laboratory was made operating variables (reactant concentration, pH and oxidation potential) of pyrite leaching gold from river Tablachaca (Ancash Peru) with thiourea (TU) followed by electro-deposition of gold. The experimental study was conducted in three stages: Oxidation of thiourea leaching of gold and gold electroplating. As an alternative to chemical agents, TU oxidation via electrolysis was conducted to obtain formamidine disulphide (FDS), which serves as an oxidizer in the dissolution of gold. The optimum degree of conversion of formamidine disulfide thiourea in 2.5 h was obtained by applying a FEM of 4.5 V with a pH of 1.5. The anodic and cathodic compartments of the electrochemical reactor were separated by an anion membrane with the purpose of eliminating undesired reactions at the cathode. Prior to the leaching step, the mineral was washed with sul...