Sustainable use of extracts of animal and vegetable origin as additives to prevent corrosion in the fertilizer chain

摘要

The fertilizer industry in Brazil has been growing at an accelerated pace driven by the increase in The fertilizer industry in Brazil has been growing at an accelerated pace driven by the increase in agribusiness, however this industrial chain involves continuous operation in an aggressive environment, generating stops for corrective maintenance due to the wear and tear of the industrial chain due to corrosion. In recent years, the cost of the industry with maintenance has reached 4 in relation to gross sales. With the objective of reducing this cost and aiming at sustainability, new techniques have been invested to protect the production plant against the severe effects of corrosion, aiming at increasing production, reducing maintenance stops, extending the plant's useful life and decrease in toxic waste. Several studies with extracts of animal and plant origin have been carried out as possible corrosion protection additives for metallic surfaces, as they are considered environmentally correct, forming a film at the corrosive metal-medium interface. This work shows corrosion studies by electrochemical techniques on 1020 steel containing extracts of Struthio Camelus (ostrich), Crolatus Durissus (rattlesnake) and Elaeis Guineensis (palm and palm kernel) in a solution of Sodium Chloride (NaCl) and 3 Urea. The results indicated a significant decrease in the corrosion rates of steel when submitted to 3 Urea in the presence of all extracts, when compared with the results obtained in the presence of 3 NaCl. Carbon steel with Crolatus Durissus extract in Urea 3 showed a corrosion rate of 0.003 mm/year, the best behavior in this medium, followed by Elaeis Guineensis extract, 0.009 nun/year. Steel in the presence of Elaeis Guineensis with 3 NaCl showed a corrosion rate of 0.05 mm/year, being the best result for the medium.