Abstract
We investigated the unique passive behaviour of Hybrid steel in de-aerated sulfuric acid and aqueous sodium chloride solutions through corrosion tests, surface analysis, and thermochemical modelling. Electrochemical measurements confirmed that Hybrid steel possesses stainless steel characteristics, including passivity, breakdown, and pitting, akin to low-alloyed stainless steel. Synchrotron hard X-ray photoelectron spectroscopy revealed a dynamically protective nanoscale passive film composed of Fe, Cr, Ni, and Al oxides, contributing to its stainless nature. The presence of Al and Ni enhances Cr’s role in forming a spontaneously passive and protective surface, resulting in exceptional corrosion resistance in acidic and chloride-containing solutions. Hybrid steel’s surface oxides remain robust even beyond the Cr(III)-to-Cr(VI) redox potential, distinguishing it from other stainless steels. This work demonstrates the potential for designing sustainable stainless steel with high-strength properties without requiring the conventional Cr threshold concentration of 10.5 per cent.
| Original language | English |
|---|---|
| Article number | 71 |
| Journal | npj Materials Degradation |
| Volume | 7 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Dec 2023 |
Bibliographical note
Publisher Copyright:© 2023, Springer Nature Limited.
Funding
This work was supported by TÜBITAK (The Scientific and Technological Research Council of Türkiye) under contract number 118C227 within the program 2232: International Fellowship for Outstanding Researchers. In addition, we acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, to provide experimental facilities. The synchrotron measurement was carried out at beamline P22 at PETRA III. Furthermore, HWY and CEC appreciate the financial support from the National Science and Technology Council (NSTC) in Taiwan (NSTC 109-2628-E-002-009-MY3). This work was supported by TÜBITAK (The Scientific and Technological Research Council of Türkiye) under contract number 118C227 within the program 2232: International Fellowship for Outstanding Researchers. In addition, we acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, to provide experimental facilities. The synchrotron measurement was carried out at beamline P22 at PETRA III. Furthermore, HWY and CEC appreciate the financial support from the National Science and Technology Council (NSTC) in Taiwan (NSTC 109-2628-E-002-009-MY3).
| Funders | Funder number |
|---|---|
| National Science and Technology Council | 109-2628-E-002-009-MY3 |
| Türkiye Bilimsel ve Teknolojik Araştırma Kurumu | 118C227 |
| Helmholtz Association |