Corrosion behavior of high- and low-chromium steel grinding balls in chloride solution

Autori

  • Snežana Marković University of Belgrade, Technical Faculty in Bor, Bor, Serbia Autor
  • Bojana Radojković University of Belgrade, Institute for Chemistry, Technology and Metallurgy, Belgrade, Serbia Autor
  • Bore Jegdić University of Belgrade, Institute for Chemistry, Technology and Metallurgy, Belgrade, Serbia Autor
  • Aleksandar Jovanović Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia Autor
  • Jovica Stojanović Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia Autor
  • Milan Trumić University of Belgrade, Technical Faculty in Bor, Bor, Serbia Autor
  • Vaso Manojlović University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia Autor https://orcid.org/0000-0002-3009-2909

DOI:

https://doi.org/10.62638/zasmat998

Ključne reči:

Low-alloy Steel, Stainless Steel, Electrochemical Corrosion, LPR, EIS, LSV, Seawater

Apstrakt

The corrosion behaviour of three types of alloys (two low-alloy carbon steel and one stainless iron with ~15 wt.% Cr), in a solution which simulates seawater (3% NaCl solution, pH 8.1) was tested. Tested samples are used to make steel (iron) balls applied in mils for grinding copper and other ore. The corrosion tests were performed using three electrochemical methods, at room temperature in the presence of atmospheric oxygen. The linear polarization resistance (LPR) method, electrochemical impedance spectroscopy (EIS) method, and linear sweep voltammetry (LSV) method were applied. Based on measurements by LPR and EIS methods (as non-destructive methods), the value of polarization resistance (Rp) was determined and the general corrosion rate (vcorr) of the examined samples was calculated. The obtained values of the general corrosion rate can be used to calculate the service life of steel (iron) balls under exploitation conditions (seawater). The appearance of the surface after linear sweep voltammetry (LSV) measurement showed the presence of localized corrosion (pits were formed) of the tested samples, especially stainless iron, and the LSV method is not suitable for the determination of the general corrosion rate of tested samples in seawater. This form of corrosion occurs at high anodic polarizations, during performing LSV measurements.

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2024-03-15

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Scientific paper