Potentiodynamic Polarization Behavior and Pitting Corrosion Analysis of 2101 Duplex and 301 Austenitic Stainless Steel in Sulfuric Acid Concentrations
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Springer International Publishing
Abstract
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The corrosion behavior of 2101 duplex and 301
austenitic stainless steel in the presence of sulfate (SO4
2�)
anion concentrations was investigated through polarization
techniques, weight loss and optical microscopy analysis.
The corrosion rates of the steels were comparable after 3M
H2SO4. Results confirm that the duplex steel displayed a
higher resistance to pitting corrosion than the austenitic
steel. Experimental observation shows that its pitting
potential depends on the concentration of the SO4
2� ions in
the acid solution due to adsorption of anions at the metalfilm
interface. The duplex steel underwent stable pitting at
relatively higher potentials and significantly higher corrosion
current than the austenitic steel. The duplex steel
exhibited lower corrosion potential values thus less likely
to polarize in the acid solution. Solution concentration had
a limited influence on the polarization behavior of the
austenitic steel and hence its reaction to SO4
2� ion penetration
from analysis of the pitting potentials and
observation of its narrower polarization scans compared to
the duplex steel which showed wide scatter over the
potential domain with changes in concentration
Keywords
T Technology (General), TJ Mechanical engineering and machinery