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Synergistic Effect of HCO3− and Alternating Current on Corrosion Behavior of CoCrNi Medium-Entropy Alloy in Simulated Marine Environment.

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Title: Synergistic Effect of HCO3− and Alternating Current on Corrosion Behavior of CoCrNi Medium-Entropy Alloy in Simulated Marine Environment.
Authors: He, F.1 (AUTHOR), Zhu, M.1 (AUTHOR) zmii2009@163.com, Yuan, Y. F.1 (AUTHOR), Guo, S. Y.2 (AUTHOR), Mao, S. S.2 (AUTHOR)
Source: Journal of Materials Engineering & Performance. Aug2024, Vol. 33 Issue 16, p8372-8385. 14p.
Subjects: Alternating currents, Passivation, Hydrogen atom, Corrosion resistance, Nucleation
Abstract: The corrosion behavior of CoCrNi medium-entropy alloy (MEA) in the coastal marine environment polluted by excessive CO2 was investigated. Increasing NaHCO3 concentration expediates the active dissolution of the passive film and damages its protectiveness. The positive half-cycle of AC increases local acidity and encourages Cl− to adsorb on the passivation film, whereas H+ ions are easily adsorbed during the AC-negative half-cycle. H+ and Cl− as aggressive ions can significantly undermine the stability and denseness of passivation film. Furthermore, the interactive effect of alternating current and HCO3− significantly interferes with the passivation of the MEA, contributes to the nucleation of metastable pitting, and increases the occurrence probability of stable pitting, aggravating anti-corrosion performance. The cathodic reaction under the influence of alternating current is dominated by hydrogen evolution; the generated hydrogen atoms can tear the passivation film and deteriorate the corrosion resistance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The corrosion behavior of CoCrNi medium-entropy alloy (MEA) in the coastal marine environment polluted by excessive CO2 was investigated. Increasing NaHCO3 concentration expediates the active dissolution of the passive film and damages its protectiveness. The positive half-cycle of AC increases local acidity and encourages Cl− to adsorb on the passivation film, whereas H+ ions are easily adsorbed during the AC-negative half-cycle. H+ and Cl− as aggressive ions can significantly undermine the stability and denseness of passivation film. Furthermore, the interactive effect of alternating current and HCO3− significantly interferes with the passivation of the MEA, contributes to the nucleation of metastable pitting, and increases the occurrence probability of stable pitting, aggravating anti-corrosion performance. The cathodic reaction under the influence of alternating current is dominated by hydrogen evolution; the generated hydrogen atoms can tear the passivation film and deteriorate the corrosion resistance. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-023-08531-y