Investigation in the corrosion behaviour of bulk nanocrystalline 316L austenitic stainless steel in NaCl solution

Author

Eskandari, Mohsen ; Yeganeh, M. ; Motamedi, Mohammad

Author_Institution

Dept. of Mater. Eng., Isfahan Univ. of Technol., Isfahan, Iran

Volume

7

Issue

4

fYear

2012

fDate

4/1/2012 12:00:00 AM

Firstpage

380

Lastpage

383

Abstract

Corrosion resistance of nanocrystalline 316L stainless steel was compared with a coarse-grained (CG) one using potentiodynamic polarisation and electrochemical impedance spectroscopy methods and electron microscopy. The results showed that the corrosion resistance of nanocrystalline 316L stainless steel was higher than CG stainless steel. It was attributed to unstable passive layer on CG 316L stainless steel, which could be removed in a corrosive medium. The lower grain size facilitated fast diffusion of Cr and formation of passive layer. Nanocrystalline 316L stainless steel showed a relatively stable current density in anodic potentials, which was related to the higher corrosion resistance of nanocrystalline 316L stainless steel.

Keywords

austenitic stainless steel; corrosion resistance; current density; diffusion; electrochemical impedance spectroscopy; grain size; nanostructured materials; scanning electron microscopy; transmission electron microscopy; anodic potentials; bulk nanocrystalline 316L austenitic stainless steel; coarse-grained 316L stainless steel; corrosion resistance; current density; diffusion; electrochemical impedance spectroscopy; electron microscopy; grain size; passive layer; potentiodynamic polarisation;

fLanguage

English

Journal_Title

Micro & Nano Letters, IET

Publisher

iet

ISSN

1750-0443

Type

jour

DOI

10.1049/mnl.2012.0162

Filename

6194431