Cite the paper
Mechanics, Materials Science & Engineering, 17 , 2019, ISSN: 2412-5954.
Authors: Marcy Viviana Chiquillo Márquez, Janaína André Cirino, Magda Rosangela Santos Vieira, Severino Leopoldino Urtiga Filho
ABSTRACT. We evaluate the corrosion morphology and the Hardness Vickers (HV) behaviour of ASTM 572 Gr50 structural steel. This was exposed to intermittent stirring process under the influence of aqueous fluids with different chemical compositions. We have seen that after 32 days of stirring process, the steel shows highest corrosion rate when it was exposed to natural seawater (NSW). We observed the increase in the values of HV for the samples taken, when an increase in exposure time occur. The corrosion product formed on the surface steel during immersion process, into natural and artificial seawater (ASW), composes of γ-FeOOH,〖 Fe〗2 O3,〖Fe〗3 O4 and NaCl. We have also seen the formation of compact oxide scales of 〖Fe〗3 O4,〖Fe〗2 O3 on the samples immersed in deionized water (DIW). With the help of Scanning Electron Microscopy (SEM) test, the surface morphology shows higher attack in the samples exposed to NSW. The steel showed a lower corrosion rate in DIW system after the immersed process. Open Circuit Potential (OCP), Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS) curves of the steel in stagnant conditions show active dissolution behaviour when exposed to the fluids, displaying lowest current density and corrosion potential for the samples exposed to DIW; EIS allows the corroboration of these results.
Keywords: natural seawater, artificial seawater, deionized water, ASTM 572 Gr50 structural steel, corrosion, hardness Vickers
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