In this paper, the Shape Memory Steel (SMS), a new kind of ferrous SMA of the Mn family and complemented with Cr additions, is introduced as a very interesting smart material, able to be used in fitting and reshaping applications, and with the potential of being used in structural reinforcement applications. It is also more affordable than Ti- and Ni-based alloys (NiTinol) [1].
This research work is focused on the corrosion performance of the Fe-8Mn-6Si-5Cr Shape Memory Steel. The sample was immersed in a 0.1 M NaOH + 0.1 KOH solution (pH = 13) that mimics the alkalinity of the concrete pore solution. The passive layer formation, while exposed to that medium, was studied for 7 days by electrochemical means, and its degradation by Cl− additions was also assessed by progressive additions of Cl− ions in the previous solution. This aforementioned layer growth and degradation was modeled by an equivalent circuit using the EIS data, as seen in Figure 1. The evolution of the system behavior was monitored.
Figure 1.
Fe-28Mn-6Si-5Cr (SMS) and carbon steel at 72 h of immersion time in a 0.1 M NaOH + 0.1 M KOH solution.
Supplementary Materials
The conference presentation poster is available at https://www.mdpi.com/article/10.3390/CMDWC2021-10063/s1.
Funding
This work has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 769255. This document only reflects the views of the authors. Neither the Innovation and Networks Executive Agency (INEA) nor the European Commission are in any way responsible for any use that may be made of the information that this document contains.
Reference
- Zhao, C. Shape Memory Stainless Steels. Adv. Mater. Process. 2001, 159, 33–35. [Google Scholar]
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