ABSTRACT
Understanding the phenomena involved in the corrosion of mild steel in H2SO4 media is of fundamental importance as it is a principal product of the chemical industry. However, a few recent studies have reported the corrosion of mild steel in H2SO4 at different sulfate concentrations. This study aims to investigate the corrosion of mild steel in 1 mol L–1 H2SO4 with the addition of sulfate ions from saline sources. Open-circuit potential measurements, immersion tests with mass loss, quantification of total iron ion content in solution, and potentiodynamic polarization curves were conducted. This suggests that the corrosion of mild steel in H2SO4 with added sulfate occurs via a dissolution-passivation mechanism, which is influenced by the concentration of added sulfate. Micrographs of the mild steel surface indicate that corrosion occurs uniformly with the formation of insoluble corrosion products that are non-homogeneously distributed on the metal surface. These products were likely associated with the precipitation of FeSO4 and/or Fe(OH)3 on the surface.
Keywords:
Corrosion; Mild Steel; Sulfuric Acid; Sulfate; Open Circuit Potential
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) 0 mol L–1, (
) 0,1 mol L–1, (
) 0,2 mol L–1, (
) 0,3 mol L–1, (
) 0,4 mol L–1 e (
) 0,5 mol L–1.
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) 0,2 mol L–1, (
) 0,5 mol L–1 de SO42–.
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