abstract
This study addresses the fundamentals of corrosion inhibition of AA2024 alloy by tannic acid (TA), a Cr-free and eco-friendly natural product. To this end, the AA2024 alloy was immersed in NaCl solution (50 mM) with different TA concentrations (0.1-10 mM) for 7 days. Surface (SEM, Raman, and SKPFM) and electrochemical analyses (EIS, PDP, and SVET) revealed mixed inhibition after 1 day of immersion in TA solution. Long-term immersion tests in TA solutions produced a tannate-rich oxide film on the surface. The films with low tannate content (formed in 0.1 and 1 mM TA) showed the highest stability and corrosion resistance.
keywords
PROBE FORCE MICROSCOPY; SCANNING KELVIN PROBE; ALUMINUM-ALLOY; PROTECTION; STEEL; RAMAN; COMPLEXATION; VANADATE; BEHAVIOR; 2024-T3
subject category
Chemistry; Materials Science; Physics
authors
del Olmo, R; Bastos, A; Yasakau, K; Sushkova, A; Arrabal, R; Tedim, J
our authors
Alesia Sushkova
PhD Student
António Alexandre Cunha Bastos
Assistant Researcher
João Tedim
Associate Professor with Aggregation
Kiryl Yasakau
Assistant ResearcherProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
This work was developed within the Scope of Project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/5 0011/2020) , UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) , and LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) , financed by National funds through the FCT/MEC (PIDDAC) . R. del Olmo acknowledges the financial support from the Margarita Salas CT18/22 postdoctoral grant. A. Bastos is funded by National funds (OE) , through FCT-Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. K. Yasakau acknowledges the FCT for the researcher grant (2021.00842.CEECIND) . PhD grant of Alesia Sushkova is funded by the FCT and FSE- Fundo Social Europeu (2021.07744.BD) . R. Arrabal acknowledges the support by PID2021-124341OB-C22 (MICINN/AEI/FEDER, UE) .