## 4 Conclusions  
After studying the effect of the thermomechanical treatments on corrosion behavior of carbon steel rebars in chloride contaminated synthetic FA pore solution, the following conclusions are drawn:  
* Martensite was observed on the as-received sample near the edge of the rebar, whereas pearlite and cementite were found on the annealed sample with larger grain size. Smaller grains as well as Widmanstatten ferrite was found on the normalized sample near the edge. A full martensitic microstructure was obtained after quenching, whereas a mix of bainite and martensite is revealed after a subcritical annealing process. * Steel exposed to FA pore solution showed no active corrosion for the as-received samples due to the formation of a passive layer that protected the material even with chloride concentrations of 0.6 M NaCl. Such behavior worsens as the cooling rate of the rebars is increased due to the more active microstructure. The highest corrosion susceptibility was found to be in the martensite structure, followed by coarse and bigger grain size, bainitic and pearlite steel. * Higher \(i_{\text{corr}}\) values were observed for the samples containing martensite, namely the quenched specimens. These \(i_{\text{corr}}\) values were in the range of 3.18 \(\times\) 10\({}^{-5}\) and 2.20 \(\times\) 10\({}^{-5}\) A/cm\({}^{2}\), whereas the as-received sample showed an \(i_{\text{corr}}\) values of 2.13 \(\times\) 10\({}^{-6}\) A/cm\({}^{2}\). Additionally, an increased \(i_{\text{corr}}\) value of 2.09 \(\times\) 10\({}^{-5}\) A/cm\({}^{2}\) was found on the annealed sample presenting coarse grain. * \(C_{\text{eff,all}}\) shows the lower stability of the passive film as the cooling rate increased, from 1.11 \(\times\) 10\({}^{-3}\) to 8.12 \(\times\) 10\({}^{-4}\)\(\mu\)F/cm\({}^{2}\) for as-received and water quenched samples, respectively. * Higher pit depth was observed for the quenched samples, with an average pit depth of 5 \(\mu\)m. Similarly, the annealed sample showed four times the average pit depth compared to the as-received sample, 4 and 1 \(\mu\)m, respectively. These findings are in accordance with the EIS and CPP results. Conceptualization, D.M.B. ; methodology, J.B., U.M., J.R., K.K. and D.M.B. ; formal analysis, J.B., U.M., J.R. and D.M.B. ; investigation, J.B., U.M., J.R., K.K. and D.M.B. ; resources, D.M.B. ; data curation, J.B., U.M., J.R., K.K. and D.M.B. ; writing--original draft preparation, J.B., U.M., J.R. and D.M.B. ; writing--review and editing, J.B., U.M., J.R. and D.M.B. ; visualization, D.M.B. ;  
Figure 12: IFM microscopies of thermomechanically treated samples after testing in FA pore solution containing 0.6 M NaCl (\(\times\)5): (**a**) As received, (**b**) Annealing, (**c**) Normalizing, (**d**) Water quenching, (**e**) Oil quenching, (**f**) subcritical annealing after water quenching, and (**g**) subcritical annealing after oil quenching. supervision, D.M.B. ; project administration, D.M.B. ; funding acquisition, D.M.B. All authors have read and agreed to the published version of the manuscript. This research was funded by Firestone Research Grant 639430, and The University of Akron. Institutional Review Board Statement: Not applicable. Informed Consent Statement: Not applicable. Data Availability Statement: The data is not available due to an ongoing research project. Acknowledgments: The authors acknowledge the technical support and facilities from The National Center for Education and Research on Corrosion and Materials Performance (NCERCAMP-UA), The College of Engineering and Polymer Science and The University of Akron. Conflicts of Interest: The authors declare no conflict of interest.