TY - JOUR
T1 - Fabrication of sputtered Ce/La, La/Ce oxide bilayers on AA6061 and AA7075 aluminum alloys for the development of corrosion protective coatings
AU - Brachetti-Sibaja, Silvia B.
AU - Domínguez-Crespo, Miguel A.
AU - Torres-Huerta, Aidé M.
AU - Rodil-Posada, Sandra E.
AU - López-Oyama, Ana B.
AU - García-Zaleta, David S.
AU - Onofre-Bustamante, Edgar
N1 - Publisher Copyright:
© 2018 by the authors.
PY - 2018/6/29
Y1 - 2018/6/29
N2 - This work provides a comparative study on the corrosion protection efficiency of Ce, La films as well as Ce/La and La/Ce oxide bilayered coatings deposited onto AA7075 and AA6061 substrates by the radio frequency (RF) magnetron sputtering technique. The coating thickness ranged approximately from 12 to 835 nm, which changed with the deposition parameters and substrate composition. The relationship between microstructure, roughness and electrochemical performance is examined. The reactivity and crystallinity of rare earth (RE) films can be tailored by adjusting the sputtering parameters. Sputtered La films with thickness ca. 390 nm and average roughness of 66 nm showed the best corrosion protection properties in chloride medium as determined by potentiodynamic curves and electrochemical impedance spectroscopy (EIS). The method to obtain RE bilayered coatings, i.e., La/Ce or Ce/La as well as the substrate composition and applied power conditioned their inhibition properties. The RE bilayered coatings displayed better barrier properties than Ce films, which were poorer than those featured by La films.
AB - This work provides a comparative study on the corrosion protection efficiency of Ce, La films as well as Ce/La and La/Ce oxide bilayered coatings deposited onto AA7075 and AA6061 substrates by the radio frequency (RF) magnetron sputtering technique. The coating thickness ranged approximately from 12 to 835 nm, which changed with the deposition parameters and substrate composition. The relationship between microstructure, roughness and electrochemical performance is examined. The reactivity and crystallinity of rare earth (RE) films can be tailored by adjusting the sputtering parameters. Sputtered La films with thickness ca. 390 nm and average roughness of 66 nm showed the best corrosion protection properties in chloride medium as determined by potentiodynamic curves and electrochemical impedance spectroscopy (EIS). The method to obtain RE bilayered coatings, i.e., La/Ce or Ce/La as well as the substrate composition and applied power conditioned their inhibition properties. The RE bilayered coatings displayed better barrier properties than Ce films, which were poorer than those featured by La films.
KW - Bilayer
KW - CeO
KW - Cerium oxide
KW - Corrosion
KW - LaO
KW - Lanthanum oxide
KW - Magnetron sputtering
KW - Rare earth
KW - Thin film
UR - http://www.scopus.com/inward/record.url?scp=85049467554&partnerID=8YFLogxK
U2 - 10.3390/ma11071114
DO - 10.3390/ma11071114
M3 - Artículo
AN - SCOPUS:85049467554
SN - 1996-1944
VL - 11
JO - Materials
JF - Materials
IS - 7
M1 - 1114
ER -