Avaliação da influência das águas de poço e industrial tratada na corrosão do cobre

Abstract

Efficient corrosion monitoring prevents, in an industry, unplanned downtime for corrective maintenance to exchange parts, pipes, materials, components and equipment made of copper that have contact with raw or treated water and that suffer wear and tear over time. This work monitored through the exposure of well water and treated a cosmetics industry, located in the State of Pará, the level of corrosivity when in contact with corrosion coupons (proof bodies) made of copper. The method of analysis consisted of immersing these coupons in well water and industrial water for 7, 14, 21 and 28 days. In each period, the coupons were removed clean and taken to mass loss tests, corrosion rate, corrosion potential and polarization curves. In addition to physicalchemical and microbiological analyzes of water samples for the calculation of stability, which shows whether the trend is stable, corrosive or fouling. The results showed that well water has low corrosivity and industrial water has moderate corrosivity, even receiving chemical treatment for pH correction and microbiological control. The loss of mass and the corrosion rate of the copper coupon were greater for industrial water and the polarization curves and corrosion potential showed that industrial water has a high degree of corrosion compared to well water.