Corrosion behavior of low carbon steel processed by ECAP in neutral and alkaline environment

Jorgimara Oliveira Braga,Jefferson Fabricio Lins,Izabel Lima Criscuolo,Ursula Cid Pereira,Helder Alves De Almeida Junior,Cláudio Marcio Santana,Gabriel Pessoa De Castro,Igor Cuzzuol Dos Santos,Gustavo Henrique Sousa

doi:10.4322/2176-1523.20212340

Jorgimara Oliveira Braga, Jefferson Fabricio Lins + Show 7 more

Open Access

https://doi.org/10.4322/2176-1523.20212340

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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.

Highlights

2 MethodologyLow carbon steels account for about 70% of the world’s ferrous alloy production
Materials with ultrafine grains (UFG) are of great interest, since the grain refinement promotes an increase in the material mechanical properties, enabling the production of components and structures that demand high mechanical resistance and high corrosion resistance [3]
The purpose of this study is to obtain more information about corrosion behavior of low carbon steel processed by Equal Channel Angular Pressing (ECAP) in different solutions, since there are many contraverses about the type of corrosion and electrochemical studies in steel that undergo severe plastic deformation (SPD)

Summary

Introduction

Low carbon steels account for about 70% of the world’s ferrous alloy production. These materials have been used in a range of industrial applications, from immense structural components to small parts of mechanical devices. Some requirement mechanical properties of low carbon steels used for structural purposes are fatigue strength, wear resistance, mechanical strength associated with good toughness, weldability and corrosion resistance [1]. One of the methods applied to improve the mechanical properties of low carbon steels is the reduction of the material grain size using severe plastic deformation techniques. Materials with UFG are of great interest, since the grain refinement promotes an increase in the material mechanical properties, enabling the production of components and structures that demand high mechanical resistance and high corrosion resistance [3]

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