Electrochemical behaviour of high nitrogen bearing stainless steel in acidic chloride solution: Effects of oxygen, acid concentration and surface roughness

The effects of oxygen, H 2SO 4 concentration and surface roughness on the electrochemical behaviour of high nitrogen bearing stainless steel (HNS) in acidified 0.5 M NaCl solution were investigated using potentiodynamic polarization method. The results revealed three corrosion potentials indicating...

Full description

Saved in:
Bibliographic Details
Published in:Electrochimica acta 2009-03, Vol.54 (8), p.2298-2304
Main Authors: Qiao, Y.X., Zheng, Y.G., Okafor, P.C., Ke, W.
Format: Article
Language:English
Subjects:
Acid
Applied sciences
Corrosion
Corrosion mechanisms
Corrosion potentials
Exact sciences and technology
Metals. Metallurgy
Oxygen
Stainless steel
Surface roughness
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effects of oxygen, H 2SO 4 concentration and surface roughness on the electrochemical behaviour of high nitrogen bearing stainless steel (HNS) in acidified 0.5 M NaCl solution were investigated using potentiodynamic polarization method. The results revealed three corrosion potentials indicating an unstable system. The number of the potentials was influenced by H 2SO 4 concentration. Three potentials existed above 0.011 M H 2SO 4, two between 0.011 and 0.0065 M H 2SO 4 and one below 0.0065 M H 2SO 4. Oxygen increased the number of corrosion potential at 0.005 M H 2SO 4 + 0.5 M NaCl solution while surface roughness had no noticeable influence on the number of potentials but increased the values of the corrosion potentials and passivation current densities with increase in the surface roughness. The corrosion mechanism has been discussed using the ideal polarization curve models.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2008.10.038