Interpretation of electrochemically and chemically investigated corrosion behaviors of 316L SS in acid chloride environments |
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Authors: | In -Seop Lee |
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Affiliation: | (1) Materials Research Group, Korea Orthopaedics & Rehabilitation Engineering Center, #47-3 Koosan-Dong, Pupyong-Ku, 403-120 Inchon, Korea |
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Abstract: | The electrochemical behavior of 316L stainless steel was investigated in acid chloride environments, and pitting potentials
were determined electrochemically and chemically. An increase in the anodic maximum current density was observed upon decreasing
the cathodic potential from which the scan was initiated to determine the polarization curve. To determine the critical pitting
potential through the chemical method, the potential was increased by increasing the concentration of ferric ions in ferric
chloride while holding the chloride ion concentration constant with sodium chloride. When 316L stainless steel was immersed
in 15 g/1 of FeCl36H2O containing the same chloride ion concentration as 5% NaCl with pH=2 at 57°C, the corrosion potential increased to 0.47 V
(SHE) within two minutes due to initial passivation. Immediately after reaching 0.47 V (SHE), which was just above the pitting
potential of 0.45 V (SHE) determined electrochemically in 5% NaCl (pH=2, 57°C), the corrosion potential continuously decreased,
indicating the onset and propagation of pitting corrosion. A correlation between the electrochemical and chemical methods
can be verified if the proper measurements are made and the observations are properly interpreted. |
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