Journal
CORROSION SCIENCE
Volume 193, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109888
Keywords
Medium-entropy alloy; Corrosion; Nanostructures; Atom probe tomography; Layered structures
Funding
- LG Electronics [C2017210664]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016M3D1A1023384]
- NRF of Korea - Ministry of Education [2021R1A6A3A03044109]
- National Research Foundation of Korea [2021R1A6A3A03044109] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel alloy design strategy for improving corrosion resistance of Al-Cu-Fe-Mn immiscible dual-phase medium-entropy alloy by adding Cr is proposed and experimentally verified. The corrosion resistance of the alloy is significantly enhanced, with tri-layer oxide layers of Cu-, Cr-, and Fe-rich oxides forming during corrosion, leading to comparable corrosion resistance to austenitic stainless steels.
Here, a novel alloy design strategy for improving corrosion resistance of Al15(CuFeMn)85 (at%) immiscible dualphase medium-entropy alloy is proposed and verified experimentally. The corrosion resistance of the alloy significantly enhances with the addition of Cr. During the corrosion of the Cr-containing alloy, three different oxide layers of Cu-, Cr-, and Fe-rich oxide layers with a few nm thickness are sequentially formed as a layered structure. Such tri-layer oxide enhances corrosion resistance by shielding the surface of the matrix, and the corrosion resistance of the alloys is comparable to that of austenitic stainless steels.
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