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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Potentiodynamic polarization curves for tested specimens at 20 ± 3 °C. The pitting potentials Ep related to the as received 20 and SP 20 curves are marked by the arrows.