Person:
Pillado Ríos, Borja

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First Name
Borja
Last Name
Pillado Ríos
URI
https://hdl.handle.net/20.500.14352/76118
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Ingeniería Química y de Materiales
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Author: Mingo, Beatriz ×

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    Layered Double Hydroxide Coatings Loaded with Corrosion Inhibitors for Corrosion Protection of AZ31 †
    (materials proceedings, 2021) Pillado Ríos, Borja; Mohedano Sánchez, Marta; Olmo Martínez, Rubén del; Mingo, Beatriz; Matykina, Endzhe; Arrabal Durán, Raúl
    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).
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    Data: Energy consumption, wear and corrosion of PEO coatings on preanodized Al alloy: the influence of current and frequency. Journal of Materials Research and Technology, 21, pp. 2061-2075 (2022).
    () Mohedano Sánchez, Marta; López Martínez, Esther; Mingo, Beatriz; Moon, Sungmo; Matykina, Endzhe; Arrabal Durán, Raúl; Pillado Ríos, Borja