PSI - Issue 22

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Procedia Structural Integrity 22 (2019) 171–180

First International Symposium on Risk and Safety of Complex Structures and Components Analysis of iron FC 250 microstructure under the effect of phosphoric acid corrosion L. Sena a , R. C. Reis a , A. A. Monteiro b , C. Oliveira c,d , *, C. Reis d,e,f , P. L. Silva d,e a University Center of Anápolis - UniEvangélica, Anápolis – GO, Brazil b Universidade Estadual de Goiás - UEG / Centro Universitário deAnápolis - UniEvangélica, Anápolis, – GO, Brazil c Instituto Politécnico de Viana do Castelo, ESTG, Portugal d INEGI - Institute of Science and Innovation in Mechanical Engineering and Industrial Engineering, FEUP Campus, Porto, Portugal e University of Trás-os-montes and Alto Douro, Vila Real – Portugal f Construct, FEUP, Portugal Abstract The study of the prevention of metals corrosion by phosphoric acid has been increasing, due to its vast use in industrial processes such as the production of fertilizers and food products. About 5% of the profits of industrialized nations are spent to prevent corrosion. Several studies have been carried out to determine the corrosive behavior of cast iron in acidic and basic medium, but the resistance to corrosion in phosphoric acid has not yet been studied. The present work analyses the effects of phosphoric acid (H 3 PO 4 ) on the corrosion of FC 250 cast iron, in its structure and properties, using mass loss analysis and scanning electron microscopy (SEM). The studies were performed after samples immersion in acid solutions with concentrations of 1, 2 and 3% of content for 86,400 and 424,800 s at room temperature and in a solution of 3% at 323,15 K and 373,15 K, for 21,600 and 43,200 s. The main losses were found in the percentage of 3%, at higher temperatures and lower immersion time. H 3 PO 4 promotes the oxidation state in gray cast irons, which can compromise their structure and properties. The higher percentage of the acid causes greater mass losses, the temperature reacts in an analogous way and, in longer exposure times, the loss is sustained. irst I ter ati al si is a afet f le tr ct res a e ts l i f ir i r tr t r r t ff t f ri i rr i . Sena a , . . eis a , . . Monteiro b , . liveira c,d , *, . eis d,e,f , P. . Silva d,e a University Center of Anápolis - UniEvangélica, Anápolis – GO, Brazil b Universidade Estadual de Goiás - UEG / Centro Universitário deAnápolis - UniEvangélica, Anápolis, – GO, Brazil c Instituto Politécnico de Viana do Castelo, ESTG, Portugal d INEGI - Institute of Science and Innovation in echanical Engineering and Industrial Engineering, FEUP Ca pus, Porto, Portugal e University of Trás-os- ontes and Alto Douro, Vila Real – Portugal f Construct, FEUP, Portugal bstract The study of the prevention of etals corrosion by phosphoric acid has been increasing, due to its vast use in industrial processes such as the production of fertilizers and food products. About 5 of the profits of industrialized nations are spent to prevent corrosion. Several studies have been carried out to deter ine the corrosive behavior of cast iron in acidic and basic ediu , but the resistance to corrosion in phosphoric acid has not yet been studied. The present work analyses the effects of phosphoric acid (H 3 PO 4 ) on the corrosion of FC 250 cast iron, in its structure and properties, using ass loss analysis and scanning electron icroscopy (SE ). The studies were perfor ed after sa ples i ersion in acid solutions with concentrations of 1, 2 and 3 of content for 86,400 and 424,800 s at roo te perature and in a solution of 3 at 323,15 K and 373,15 K, for 21,600 and 43,200 s. The ain losses were found in the percentage of 3 , at higher te peratures and lower i ersion ti e. H 3 PO 4 pro otes the oxidation state in gray cast irons, which can co pro ise their structure and properties. The higher percentage of the acid causes greater ass losses, the te perature reacts in an analogous way and, in longer exposure ti es, the loss is sustained. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND licen e (htt ://creativecommons.org/licenses/by-nc nd/4.0/) Peer-review under responsibility of the First Inter ational Symposium on Risk and Safety of Complex Structures and Components organizers © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) © 2019 The Authors. Published by Elsevier . .This is an open access article under the - - license (http://creativeco ons.org/licenses/by-nc-nd/4.0/)

* Corresponding author. Tel.: +351-258-819-182. E-mail address: carlosoli@estg.ipvc.pt * Corresponding author. Tel.: +351-258-819-182. E-mail address: carlosoli estg.ipvc.pt

2452-3216 © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers 2452-3216 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativeco ons.org/licenses/by-nc-nd/4.0/) Peer-revie state ent: Peer-revie under responsibility of the First International Sy posiu on isk and Safety of o plex Structures and o ponents organizers

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers 10.1016/j.prostr.2020.01.024