Corrosion behavior of low carbon steel processed by ECAP in neutral and alkaline environment
Comportamento de corrosão de aço com baixo carbono processado por ECAP em ambiente neutro e alcalino
Jorgimara Oliveira Braga, Jefferson Fabricio Lins, Gabriel Pessoa de Castro, Helder Alves de Almeida Junior, Igor Cuzzuol dos Santos, Gustavo Henrique Sousa, Izabel Lima Criscuolo, Cláudio Marcio Santana, Ursula Cid Pereira
Abstract
The purpose of this study was to evaluate the corrosion behavior of 1010 steel processed by Equal Channel Angular Pressing (ECAP), a technique that induces severe plastic deformation (SPD) in materials. The samples were processed by one and two passes of ECAP throught routes A and C. The corrosion behavior was evaluate using the potentiodynamic polarization and electrochemical impedance spectroscopy, using NaCl (pH= 6.5) and sodium hydroxide/sodium phosphate (pH= 10.5) solutions. The polarization tests showed better performance for the samples processed by ECAP than in the as cast samples both in alkaline and neutral solutions. The results showed that alkaline solution presented higher corrosion rate for the as cast and one ECAP pass materials. It is seen that samples processed throught routes A and C develop a film stabilization on the surface of these samples. In addition, the values of polarization resistance obtained from the electrochemical impedance spectroscopy in NaCl environment were higher for sample processed in route C.
Keywords
Resumo
O objetivo deste estudo foi avaliar o comportamento à corrosão do aço 1010 processado por por Prensagem em Canais Equiangulares (ECAP), uma técnica que induz deformação plástica severa (DPS) em materiais. As amostras foram processadas em um e dois passes nas rotas A e C. O comportamento em relação à corrosão foi estudado por meio da polarização potenciodinâmica e espectroscopia de impedância eletroquímica em soluções de NaCl (pH = 6,5) e hidróxido de sódio/fosfato de sódio (pH = 10,5). Os testes de polarização apresentaram melhores desempenhos para as amostras processadas por ECAP do que nas amostras sem processamento, e isso ocorreu tanto na solução alcalina quanto na neutra. Os resultados mostram que os materiais no estado bruto de fusão e em apenas um passe de ECAP apresentaram maior taxa de corrosão em solução alcalina. Foi observado que as amostras processadas nas rotas A e C promoveram uma estabilização do filme em suas respectivas superfícies. Ademais, os valores de resistência de polarização obtidos por espectroscopia de impedância eletroquímica em ambiente de NaCl foram maiores para a amostra processada na rota C.
Palavras-chave
Referências
1 Abdalla AJ, Hashimoto TM, Pereira MS, Anazawa RM. Formação da fase bainítica em aços de baixo carbono. Revista Brasileira de Aplicações de Vácuo. 2008;25(3):175-181.
2 Kawasaki M, Langdon TG. Producing ultrafine-grained materials through severe plastic deformation. Emerging Materials Research. 2014;3(6):252-260.
3 Azushima A, Kopp R, Korhonen A, Yang DY, Micari F, Lahoti GD, et al. Severe plastic deformation (SPD) processes for metals. CIRP Annals. 2008;57(2):716-735.
4 Valiev RZ, Langdon TG. Principles of equal-channel angular pressing as a processing tool for grain refinement. Progress in Materials Science. 2006;51(7):881-981.
5 Figueiredo RB, Pinheiro IP, Aguilar MTP, Modenesi PJ, Cetlin PR. The finite element analysis of equal channel angular pressing (ECAP) considering the strain path dependence of the work hardening of metals. Journal of Materials Processing Technology. 2006;180(3):30-36.
6 Dobatkin S, Zrnik J, Mamuzic I. Ultrafine-grained low carbon steels by severe plastic deformation. Metalurgija. 2008;47(3):181-186.
7 Shin DH, Kim BC, Kim YS, Park KT. Microstructural evolution in a commercial low carbon steel by equal channel angular pressing. Acta Materialia. 2000;48(9):2247-2255.
8 Hadzima B, Janeček M, Estrin Y, Kim HS. Microstructure and corrosion properties of ultrafine-grained interstitial free steel. Materials Science and Engineering A. 2007;462(1-2):243-247.
9 American Society for Testing and Materials. ASTM E112-13: standard test methods for determining average grain size. West Conshohocken: ASTM International; 2015.
10 Zrník J, Mamuzić I, Dobatkin SV, Stejskal Z, Kraus L. Low carbon steel processed by equal channel angular warm pressing. Metalurgija. 2007;46(1):21-27.
11 Eletre AE, Abdallah M, Soliman MG, Mabrouk EM. Inhibition of pitting corrosion C-steel in NaCl solution by some inorganic compounds. Commun. Fac. Sci. Univ. Ank. Ser. B. 2000;46:25-31.
12 Bi H, Li Z, Liu J, Cheng Y, Toku-Gyamerah I. Study on pitting corrosion of storage tank bottom steel in acidic condition using acoustic emission. International Journal of Electrochemical Science. 2015;10:4416-4427.
13 Nagajama MI, Cohen M. The anodic oxidation of iron in a neutral solution. Journal of the Electrochemical Society. 1962;109(9):781-795.
14 Yang Y, Xiao L, Zhao Y, Wang F. Hydrothermal synthesis and electrochemical characterization of a-MnO2 nanorods as cathode material for lithium batteries. International Journal of Electrochemical Science. 2008;3(1):67-74.
15 Hu J, Cao SA, Xie J. EIS study on the corrosion behavior of rusted carbon steel in 3% NaCl solution. AntiCorrosion Methods and Materials. 2013;60(2):100-105.
16 Nady H, El-Rabiei MM, Samy M. Corrosion behavior and electrochemical properties of carbon steel, commercial pure titanium, copper and copper-aluminum-nickel alloy in 3.5% sodium chloride containing sulfide ions. Egyptian Journal of Petroleum. 2017;26(1):79-94.
Submetido em:
11/04/2020
Aceito em:
19/10/2020
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email