Robert Hornig

TU Bergakademie Freiberg

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Lutz Krüger

TU Bergakademie Freiberg

Marcel Mandel

TU Bergakademie Freiberg

Sven Bräunling

TU Dresden

Johanna‐Maria Frenck

University of Kassel

Thomas Niendorf

University of Kassel

Malte Vollmer

University of Kassel

David Rafaja

TU Bergakademie Freiberg

Christina Wüstefeld

TU Bergakademie Freiberg

Volodymyr Kietov

TU Bergakademie Freiberg

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TU Bergakademie Freiberg

University of Kassel

Max-Planck-Institut für Nachhaltige Materialien

Institute of Metallurgy

VDEh-Betriebsforschungsinstitut

Jernkontoret (Sweden)

Chinese Society for Electrical Engineering

John Wiley & Sons (Germany)

TU Dresden

Fraunhofer Institute for Machine Tools and Forming Technology

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On the polarisation and Mott-Schottky characteristics of an Fe-Mn-Al-Ni shape-memory alloy and pure Fe in NaCl-free and NaCl-contaminated Ca(OH)2,sat solution—A comparative study

Corrosion Science (2020)

Marcel Mandel Volodymyr Kietov Robert Hornig Malte Vollmer Johanna‐Maria Frenck

Passivity

Pitting Corrosion

10.1016/j.corsci.2020.109172

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Citations (29)

Study of an Mg₉₀Y₇Zn₃ alloy (WZ73) in sodium chloride solution — An analysis by correlated polarization and climate chamber testing

Engineering Reports (2021)

Robert Hornig Marcel Mandel Lutz Krüger Sven Bräunling

Abstract In the present work, the corrosion behavior of a twin‐roll cast WZ73 magnesium alloy is investigated by potentiodynamic polarization and climate chamber tests in different sodium chloride solutions. The corrosion parameters E corr and j corr are extracted from the polarization curves, and the critical concentration for the initiation of pitting corrosion is thus identified. The critical concentration for the initiation of pitting is confirmed by means of climate chamber tests. As a consequence, the WZ73 magnesium alloy is found to be highly susceptible to pitting corrosion in sodium chloride solutions of concentrations higher than 10 −4 mol/L. Moreover, when the NaCl concentration increases, the corrosion mechanism changes from pitting to filiform corrosion, which is attributed to micro‐galvanic effects. At low NaCl concentrations, the corrosion attack remains localized. When the NaCl concentration increases, pitting occurs and, in addition to the pits that form, micro‐galvanic corrosion leads to filiform corrosion attack. This is caused by the electrochemical potential of the long period stacking ordered phase, which is higher than that of the α‐Mg matrix. Consequently, the corrosion attack is focused on the phase boundary between the α‐matrix and LPSO phases.

Pitting Corrosion

Galvanic corrosion

Crevice corrosion

Galvanic cell

10.1002/eng2.12372

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Citations (1)

Author response for "Study of an Mg 90 Y 7 Zn 3 alloy ( WZ73 ) in sodium chloride solution — An analysis by correlated polarization and climate chamber testing"

Robert Hornig Marcel Mandel Lutz Krüger Sven Bräunling

10.1002/eng2.12372/v2/response1

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