Electrochemical Corrosion Characteristics of 439 Ferritic, 301 Austenitic, S32101 Duplex and 420 Martensitic Stainless Steel in Sulfuric Acid/NaCl Solution
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Springer International Publishing
Abstract
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The corrosion behavior and pitting corrosion
resistance of 439 ferritic, 301 austenitic, 420 martensitic
and S32101 duplex stainless steel in 2 M H2SO4 at
0–1.5%NaCl concentrations were studied through potentiodynamic
polarization measurement and optical microscopy
analysis. Experimental observation shows that
corrosion rate, pitting potential and passivation potential
are influenced by the Cl- ion concentration, alloy composition
and metallurgical properties of the steels. 439
ferritic steel had significantly the lowest corrosion rate and
highest pitting corrosion resistance. Surface morphology
showed no visible change from comparison of steel samples
before and after corrosion. The corrosion rates of the
duplex steel were comparably lower than the austenitic and
martensitic steel; however, it had the least pitting corrosion
resistance with respect to Cl- ion concentration. The
martensitic steel despite quenching heat treatment for
improved corrosion resistance had the highest corrosion
rate values. The surface morphology of the steel samples
except 439 ferritic steel showed the presence of micro- and
macro-pits, and visible surface deterioration.
Keywords
T Technology (General), TJ Mechanical engineering and machinery