Análise do teor de corrosividade: impacto das águas subterrâneas do estado do Ceará em materiais à base de cobre e aço-carbono

Abstract

The present study aims to monitor the corrosion rate and the physical-chemical parameters of Total Iron, Total Copper, pH, and Conductivity over 35 days, considering that water samples were exposed to SAE-AISI 1020 carbon steel and Copper. Furthermore, using the gravimetric mass loss method, analyze the corrosion rate of these metals after exposure to these waters, and evaluate the corrosivity. As well as studying corrosion potentials using electrochemical methods. The gravimetric tests for mass loss were performed based on the Associação Brasileira de Normas Técnicas (ABNT) through NBR 6210 of 11/2008, which determines the processes necessary to carry out the studies of corrosion rates. The physical-chemical analyses of pH, Conductivity, and Total Iron were performed according to the procedures reported in the Standard Methods for Examination of Water and Wastewater as described by the American Public Health Association (APHA). Therefore, the waters were classified as low in corrosivity and moderately corrosive. It was also possible to observe that the water samples exposed to SAE-AISI 1020 carbon steel had physical-chemical parameters above the established limits, unlike the samples exposed to copper, which predominantly obtained values within those established by CONAMA Resolution No. 396 of April 3, 2008.