Electrochemical Corrosion Evaluation of Copper-Alloyed Ductile Cast Irons

• Autorzy: Brito P. , Pereira W. , Santos W. , Gomes H.

Identyfikatory

DOI

10.24425/afe.2020.131297

• Języki publikacji: EN

Abstrakty

EN

In the present work, different Cu-alloyed model ductile irons with ferritic (0%Cu-0.09%Mn), mixed ferritic-pearlitic (0.38%Cu-0.40%Mn) and pearlitic (0.69%Cu-0.63%Mn) microstructure were produced and analyzed in terms of their electrochemical corrosion behavior in a 3.5wt.%NaCl aqueous solution containing naturally dissolved oxygen at room temperature (25°C). The remaining elements such as Si and Mg were kept at balanced levels in an attempt to minimize variations in graphite size and distribution among different samples. The corrosion resistance was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization. Microstructure analysis of the cast alloys confirmed similarity in the graphite morphology among the different cast samples and the expected variations in the metallic matrix. In the absence of passivation, it was found that the addition of copper led to an increase in corrosion resistance, which could be attested by higher values polarization resistance and corrosion potential.

Słowa kluczowe

EN

electrochemical corrosion; corrosion; environment protection; metallography; ductile iron; copper

PL

korozja elektrochemiczna; korozja; ochrona środowiska; metalografia; żeliwo sferoidalne; miedź

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 2
• Strony: 26--30
• Opis fizyczny: Bibliogr. 15 poz., rys., tab., wykr.

Twórcy

autor

Brito P.

• Pontifical Catholic University of Minas Gerais, Brazil

autor

Pereira W.

• Pontifical Catholic University of Minas Gerais, Brazil

autor

Santos W.

• Pontifical Catholic University of Minas Gerais, Brazil

autor

Gomes H.

• Pontifical Catholic University of Minas Gerais, Brazil

Bibliografia

• [1] Guo, X., Stefanescu, D.M., Chuzhoy, L. & Pershing, M.A. (1997). A mechanical properties model for ductile iron. Transactions of the American Foundrymen’s Society. 105, 47-54.
• [2] Riposan, I., Chisamera, M. & Stan, S. (2010). Performance of heavy ductile iron castings for windmills. China Foundry. 7(2), 163-170.
• [3] Peng, J.Z., Liu, L.X. & Yang, Z.X. (2010). Quality Control Measures for Heavy Ductile Iron Hub of Wind Turbine Generator. Foundry. 59, 969-972.
• [4] Al-Hashem, A., Abdullah, A. & Riad W. (2001). Cavitation corrosion of nodular cast iron (NCI) in seawater Microstructural effects. Materials Characterization. 47(5), 383-388. DOI: 10.1016/S1044-5803(02)00185-7.
• [5] Song, Y., Jiang, G., Chen, Y., Zhao, P. & Tian, Y. (2017). Effects of chloride ions on corrosion of ductile iron and carbon steel in soil environments. Scientific Reports. 7, 6865. DOI: 10.1038/s41598-017-07245-1.
• [6] Yürektürk, Y. & Baydoğan, M. (2018). Characterization of ferritic ductile iron subjected to successive aluminizing and austempering. Surface and Coatings Technology. 347, 142-149. DOI: 10.1016/j.surfcoat.2018.04.083.
• [7] Hsu, C.-H. & Chen, M.-Li. (2010). Corrosion behavior of nickel alloyed and austempered ductile irons in 3.5% sodium chloride. Corrosion Science. 52(9), 2945-2949. DOI: 10.1016/j.corsci.2010.05.006.
• [8] Hsu, C.-H. & Lin, K.-T. (2014). Effects of Copper and Austempering on Corrosion Behavior of Ductile Iron in 3.5 Pct Sodium Chloride. Metallurgical and Materials Transactions A. 45(3), 1517-1523. DOI: 10.1007/s11661-013-2059-2.
• [9] Han, Ch.F., Wang, Q.Q., Sun, Y.F. & Li, J. (2015). Effects of Molybdenum on the Wear Resistance and Corrosion Resistance of Carbidic Austempered Ductile Iron. Metallography, Microstructure, and Analysis. 4(4) 298-304. DOI: 10.1007/s13632-015-0215-3.
• [10] Medyński, D. & Janus, A. (2016). Effect of Chemical Composition on Structure and Corrosion Resistance of Ni-Mn-Cu Cast Iron. Archives of Foundry Engineering. 16(3), 59-62. DOI: 10.1515/afe-2016-0050.
• [11] Ige, O.O,. Olawale, O.J., Oluwasegun, K.M., Aribo, S., Obadele, B.A. & Olubambi, P.A. (2017). Procedia Engineering. 7, 579-583. DOI: 10.1016/j.promfg.2016.12. 084.
• [12] Boudot, A., Gerval, V., Oquab, D., Lacaze, J. & Santos, H. (1997). The role of manganese and copper in the eutectoid transformation of spheroidal graphite cast iron. Metallurgical and Materials Transactions A. 28(10), 2015-2025. DOI: 10.1007/s11661-997-0158-7.
• [13] Sancy, M., Gourbeyre, Y., Sutter, E.M.M. & Tribollet, B. (2010). Mechanism of corrosion of cast iron covered by aged corrosion products: Application of electrochemical impedance spectrometry. Corrosion Science. 52(4), 1222-1227. DOI: 10.1016/j.corsci.2009.12.026.
• [14] Arenas, M.A., Niklas, A., Conde, A., Méndez, S., Sertucha, J. & Damboronea, J.J. (2014). Comportamiento frente a la corrosión de fundiciones con grafito laminar y esferoidal parcialmente modificadas con silicio en NaCl 0,03 M. Revista de Metalurgia. 50(4), e032. DOI: 10.3989/ revmetalm.032.
• [15] Yamamoto, A. Ashiura, T. & Kamisaka, E. (1986). Mechanism of improvement on corrosion resistance by copper addition to ferritic stainless steels. Corrosion Engineering. 35(8), 448-454.

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020)