Obtenção e caracterização de compósitos sintetizados por eletrodeposição e constituídos por uma matriz de zinco e partículas poliméricas

Abstract

The present work proposes the study of a zinc composite coating obtained by electrodeposition containing nanocrystals of a natural polymer. Interventions to combat or slow down the construction process began when man began to exploit metals from natural resources. The possibility of nanocrystals being used to increase the coating strength of the zinc coating may represent a new application for this product. The composite coating was produced by electrodeposition in the absence and presence of different concentrations of Licuri, Soybean Husk and Cotton nanocrystals. In this work, the effect of the addition of nanocrystals on the morphology, structure, corrosion resistance and hardness of the zinc coating is investigated. The effect of the addition of these particles on the deposition efficiency is also investigated by means of scanning electron microscopy (SEM), X-ray diffraction, measurements of roughness and Vicker microhardness, mass loss tests, obtaining potentiodynamic polarization curves and spectroscopy. of electrochemical impedance (EIS). Current density efficiency measurements were also taken. It was found that the addition of the Licuri nanocrystal was not feasible as it did not form a stable deposit, and its use was soon discharged. With the results obtained, it became clear that the presence of the soy nanocrystal reduces the hardness but increases the corrosion resistance of the Zn coating, and this effect is related to the decrease in the coating roughness. The cotton nanocrystal in the deposition bath led to the production of a coating with finer morphology and less roughness in relation to the Zn coating obtained in the absence of the nanocrystal. It was noted that the addition of cotton nanocrystals increases the current efficiency and corrosion resistance of the zinc coating in 0.5 mol/L NaCl solution, this effect being more significant with increasing nanocrystal content. With the addition of 10% v/v cotton nanocrystals, the polarization resistance of the coating was improved by up to 5 times, while its corrosion rate was reduced by up to 6 times compared to zinc coating without nanocrystals.