RT Journal Article
T1 Layered Double Hydroxide Coatings Loaded with Corrosion Inhibitors for Corrosion Protection of AZ31 †
A1 Pillado Ríos, Borja
A1 Mohedano Sánchez, Marta
A1 Olmo Martínez, Rubén del
A1 Mingo, Beatriz
A1 Matykina, Endzhe
A1 Arrabal Durán, Raúl
AB Layered double hydroxide (LDHs) coatings were developed for the corrosion protection of AZ31 Mg alloy. AZ31 is widely used in the transport industry due to its low mass density and good mechanical properties. LDH coatings were fabricated under co-precipitation conditions and applied under hydrothermal conditions. Two different systems Zn-Al LDH and Li-Al LDH were studied. Specimens were post-treated via immersion for 2 h at 45 °C in inhibitor aqueous baths. Na2WO4·H2O and LiNO3 inorganic inhibitors were used, respectively, to produce inhibitor-loaded systems: Zn-Al LDH(W) and Li-Al LDH(Li). The characterization of the coatings was carried out by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The corrosion process was studied by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). The surface was also evaluated via the determination of water drop contact angle and the performance of a paint adhesion test using an epoxy primer. The characterization of the coating revealed two-layered coatings with a denser inner layer and a flaky outer layer. Both coatings improved the corrosion resistance of the AZ31 alloy. Loading with inhibitor further increased the corrosion resistance by one order of magnitude (bare substrate, Z10mHz~102 Ω cm2; LDH, Z10mHz~103–4 Ω cm2; LDH-inhibitor, Z10mHz~105 Ω cm2).
PB MDPI
SN 2673-4605
YR 2021
FD 2021
LK https://hdl.handle.net/20.500.14352/7478
UL https://hdl.handle.net/20.500.14352/7478
LA eng
NO FEDER/Ministerio de Ciencia e Innovación−Agencia Estatal de Investigación
NO Comunidad de Madrid
NO Ministerio de Ciencia, Innovación
DS Docta Complutense
RD 18 abr 2025