Journal
ANALYTICAL LETTERS
Volume 54, Issue 6, Pages 1055-1067Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2020.1793994
Keywords
Corrosion behavior; current density; electrochemical impedance spectroscopy (EIS); mild steel; rolling; scanning electron microscopy (SEM); X-ray diffraction (XRD)
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Funding
- research grant council (RGC), Hong Kong Ph.D. Fellowship Scheme, Hong Kong SAR, China [PF16-02783]
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The study found that cold rolling of mild steel leads to improved corrosion resistance, indicated by a higher corrosion potential, reduced corrosion current density, and higher impedance in the rolled samples as compared to the unrolled ones. This suggests that mechanical deformation can enhance the corrosion properties of metallic materials.
Upgrading the corrosion properties of metallic materials has been the dream of many corrosion experts and material scientists. The present study investigated the influence of mechanical deformation by rolling process on the corrosion behavior of mild steel through an electrochemical process in a chloride-containing environment at room temperature. The microstructures before and after rolling and corrosion tests were analyzed by scanning electron microscopy (SEM). The mild steels were first subjected to cold rolling with approximately 30% rolling reduction, and the corrosion resistance of both the unrolled and rolled samples was then determined. The polarization results revealed that the rolled mild steel sample possessed a corrosion potential of -0.118 V, reduced corrosion current density of 0.133 mA/cm(2), higher impedance, and phase angle maximum. The grain refinement and the surface roughness are related to the deformation and corrosion mechanisms.
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