2. Maestría
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Tesis de la Escuela de Posgrado
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Item Business consulting para la empresa Nexa Resources Perú S.A.A. Unidad operativa Cerro Lindo(Pontificia Universidad Católica del Perú, 2022-05-12) Acuña Aparcana, Gustavo Alejandro; Olivares Peña, Javier Alfredo; Guzman Nizama, Omar Eugenio; Cerron Piñas, Yhim; Ortiz Sosa, Lourdes MaritzaLa presente abordó la problemática de Nexa Resources, una empresa de minería y metalurgia, con énfasis en la producción de zinc y cobre, con más de 60 años de experiencia en el desarrollo de activos y con producción integrada en Brasil y Perú. A través de este estudio se concretó el desarrollo de la consultoría en unidad minera Cerro Lindo lo que hizo posible identificar las causas problemas que afectaban directamente el proceso productivo y con ello las metas de cumplimiento de producción de mineral. A partir de las mismas se precisó el camino de acción necesario para solventar dichas problemáticas. Las acciones ejecutadas como parte de esta consultoría se estiman significativas no solo por las mejoras evidentes en cuanto infraestructura y operatividad en el proceso de transporte, sino por la mejoría de condiciones del personal, el compromiso asumido por la gerencia administrativa en pro de realizar monitoreo mucho más preciso y sobre todo dado que esta inversión expresa un VAN proyectado a 5 años de $38,444,977 y una TIR de 616%, siendo un éxito el proyecto.Item Synthesis, characterization and corrosion resistance of electroless Ni-P and Ni-P-SiC coatings: a comparative study(Pontificia Universidad Católica del Perú, 2019-08-06) Camargo León, Magali Karina; Díaz Tang, Isabel; Flores Merino, Santiago EleodoroElectroless Ni-P coatings have been widely used due to their good combination of properties such as hardness, wear resistance and corrosion resistance. The addition of dispersed hard micro-particles into the Ni-P matrix has led to the development of composite coatings. Ni-P composite coatings exhibit an improved hardness and wear resistance properties; however, there is still a disagreement among researches on the corrosion behavior of composite Ni-P coatings. The present investigation involves the synthesis, characterization and a comparative study of the corrosion resistance in NaCl 3,5% of electroless Ni-P and Ni-P-SiC deposits obtained by either prepared or commercial electrolytic nickel/hypophosphite based baths. The characterization of deposits involved studies about morphology by SEM, chemical composition by energy-dispersive X-ray spectroscopy (EDX) and glow discharge optical emission spectroscopy (GDOS), microstructure by X-ray diffraction (XRD) and hardness. All deposits showed an amorphous micro-structure and high phosphorus content (10-14 wt%). Ni-P-SiC deposits showed an increased hardness (802 HV-815 HV) in comparison with Ni-P deposits (469 HV-626 HV). The techniques used to study the corrosion resistance in NaCl 3,5% were linear polarization resistance (LPR), Tafel plots and electrochemical impedance spectroscopy (EIS). These techniques agreed to show the better corrosion resistance of Ni-P-SiC coatings over the Ni-P coatings. This fact can be ascribed to the decrease in the effective metallic area available for corrosion. Ni-P-SiC deposits exhibited higher polarization resistance (Rp) values (103-66 kΩ.cm2) in comparison with Ni-P deposits (46-55 kΩ.cm2). Also, the corrosion current density values of Ni-P-SiC deposits (0,17-0,65 µA/cm2) were lower than Ni-P deposits (0,71-1,08 µA/cm2). Concerning to the mechanism by which the Ni-P and Ni-P-SiC become corroded, EIS experiments demonstrated that the corrosion process involved a charge transfer mechanism in all the cases. Tafel plots also corroborated this mechanism since of all deposits showed a Tafel behavior.