resumo
In the presented work, the possibility of direct synthesis of LDH (layered double hydroxide) on the AZ91 surface in the presence of a chelating agent (diethylenetriaminepentaacetic acid - DTPA) is reported. Conversion layer of LDH nanocontainers were formed under ambient pressure conditions without carbonate addition in the electrolyte. The obtained LDH was characterized using experimental (SEM, XRD, TGA, XPS, Raman, etc.) and computational methods (thermodynamic calculation, modeling of possible LDH crystal structures). A comparison of three possible LDHs (LDH-OH, -NO3 and -CO3) was performed. Based on the experimental results and crystal simulation approach, it was confirmed, that the mixed LDH-OH/CO3 is grown on the surface in the presence of DTPA pentasodium salt. (C) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.
palavras-chave
LAYERED DOUBLE HYDROXIDE; ACTIVE CORROSION PROTECTION; MG-AL; THERMAL-DECOMPOSITION; HYDROTALCITE; FILM; RESISTANCE; COATINGS; NITRATE; AA2024
categoria
Metallurgy & Metallurgical Engineering
autores
Shulha, T; Serdechnova, M; Iuzviuk, MH; Zobkalo, IA; Karlova, P; Scharnagl, N; Wieland, DCF; Lamaka, SV; Yaremchenko, AA; Blawert, C; Zheludkevich, ML
nossos autores
Aleksey Yaremchenko
Investigador Principal
Mikhail Zheludkevich
Investigador Principal Convidadoagradecimentos
This research was carried out with the financial support of the I2B fund (Helmholtz Association) in frame of MUFfin project as well as ACTICOAT project in frame of Era.Net RUS Plus Call 2017. A.A.Y. gratefully acknowledges financial support within the project CICECO -Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020) financed by national funds through the FCT/MCTES and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. All authors thank PETRA III (DESY, Hamburg) for the beamtime at P07b granted. The technical support of Mr. Gert Wiese during work with TESCAN LYRA 3 microscope and Mr. Ulrich Burmester during specimens preparation is gratefully acknowledged.