@misc{10498/25443,
year = {2021},
month = {6},
url = {http://hdl.handle.net/10498/25443},
abstract = {The selection of appropriate surface pretreatments is one of the pending issues for the industrial application of cerium-based chemical conversion coatings (CeCC) as an alternative for toxic chromate conversion coating (CrCC). A two-step surface pretreatment based on commercial products has been successfully used here to obtain CeCC on AA2024-T3 and AA7075-T6. Specimens processed for 1 to 15 min in solutions containing CeCl3 and H2O2 have been studied by scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX), glow discharge optical emission spectroscopy (GDOES), potentiodynamic linear polarization (LP), electrochemical impedance spectroscopy (EIS), and neutral salt spray (NSS) tests. SEM-EDX showed that CeCC was firstly observed as deposits, followed by a general coverage of the surface with the formation of cracks where the coating was getting thicker. GDOES confirmed an increase of the CeCC thickness as the deposition proceed, the formation of CeCC over 7075 being faster than over 2024. There was a Ce-rich layer in both alloys and an aluminum oxide/hydroxide layer on 7075 between the upper Ce-rich layer and the aluminum matrix. According to LP and EIS, CeCC in all samples offered cathodic protection and comparable degradation in chloride-containing media. Finally, the NSS test corroborated the anti-corrosion properties of the CeCC obtained after the commercial pretreatments employed.},
organization = {This research was funded by the Ministry of Economy, Industry and Competitiveness of Spain/FEDER Program of the EU. Project: Optimizacion y viabilidad industrial del proceso de preparacion de capas de conversion basadas en cerio sobre aleaciones de aluminio. Reference MAT2014-60857-R. The APC was funded by Instituto Universitario de Investigacion Marina (INMAR) of the University of Cadiz and the Programa de Fomento e Impulso de la Actividad de Investigacion y Transferencia of the University of Cadiz.},
publisher = {MDPI},
keywords = {aluminum},
keywords = {alloy phases},
keywords = {corrosion},
keywords = {surface pretreatments},
keywords = {CeCC},
title = {Application of Commercial Surface Pretreatments on the Formation of Cerium Conversion Coating (CeCC) over High-Strength Aluminum Alloys 2024-T3 and 7075-T6},
doi = {10.3390/met11060930},
author = {Alba Galvín, Juan Jesús and González Rovira, Leandro and Botana Pedemonte, Francisco Javier and Lekka, Maria and Andreatta, Francesco and Fedrizzi, Lorenzo and Bethencourt Núñez, Manuel},
}