Effect of Mechanical Surface Treatments on the Surface State and Passive Behavior of 304L Stainless Steel

The effect of dry grinding on 304L stainless steel’s passive behavior is compared to two other surface finishing (mechanical polishing down to 2400 with SiC emery paper and 1 µm with diamond paste, respectively). The characterization of the surface state was performed using scanning electron microsc...

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Bibliographic Details
Published in:Metals (Basel ) 2021-01, Vol.11 (1), p.135
Main Authors: Jaffré, Kathleen, Ter-Ovanessian, Benoît, Abe, Hiroshi, Mary, Nicolas, Normand, Bernard, Watanabe, Yutaka
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Compressive properties
Corrosion resistance
Diamonds
Dry grinding
Electrochemical impedance spectroscopy
Electrodes
Electrolytes
Electron microscopy
Grinding
Mechanical polishing
passive films
Plastic deformation
Point defects
Profilometers
Residual stress
Scanning electron microscopy
SEM
Spectrum analysis
Stainless steel
Surface finishing
Surface treatment
TEM
Thickness
Ultrafines
XRD
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Summary:The effect of dry grinding on 304L stainless steel’s passive behavior is compared to two other surface finishing (mechanical polishing down to 2400 with SiC emery paper and 1 µm with diamond paste, respectively). The characterization of the surface state was performed using scanning electron microscopy, transmission electron microscopy, 3D optical profilometer, and X-ray diffraction. Results indicate that each surface treatment leads to different surface states. The ground specimens present an ultrafine grain layer and a strong plastic deformation underneath the surface, while an ultrafine grain layer characterizes the subsurface of the polished specimens. Grinding induces high residual compressive stresses and high roughness compared to polishing. The characterization of the passive films was performed by electrochemical impedance spectroscopy and Mott–Schottky analysis. The study shows that the semiconductor properties and the thickness of the passive films are dependent on the surface state of the 304L stainless steel.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11010135