Corrosion resistance of cerium-based conversion coatings on alumina borate whisker reinforced AA6061 composite

Hu, Jin; Zhao, Xintao; Tang, Shawei; Ren, Weina; Zhang, Z.Y.

doi:10.1016/j.apsusc.2007.04.085

Cited by 30 publications

(26 citation statements)

References 15 publications

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“…In other words, a cathodic mechanism of protection was observed. This result is in agreement with others obtained in several aluminum alloys, including AA2017 [15,21,38,41].…”

Section: Potentiodynamic Linear Polarization (Lp)supporting

confidence: 93%

Application of Commercial Surface Pretreatments on the Formation of Cerium Conversion Coating (CeCC) over High-Strength Aluminum Alloys 2024-T3 and 7075-T6

Alba-Galvín

González-Rovira

Pedemonte

et al. 2021

Metals

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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.

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“…In other words, a cathodic mechanism of protection was observed. This result is in agreement with others obtained in several aluminum alloys, including AA2017 [15,21,38,41].…”

Section: Potentiodynamic Linear Polarization (Lp)supporting

confidence: 93%

Application of Commercial Surface Pretreatments on the Formation of Cerium Conversion Coating (CeCC) over High-Strength Aluminum Alloys 2024-T3 and 7075-T6

Alba-Galvín

González-Rovira

Pedemonte

et al. 2021

Metals

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“…8 3 .5H 2 O, NaCl, and Na 2 HPO 4 were analytical grade and deionized water was used to prepare all the treatment solutions.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Study of Corrosion Behavior of Rare Earth Based Chemical Conversion Coating on Aerospace Aluminum Alloy

et al. 2009

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The anticorrosion properties of cerium and praseodymium based chemical conversion coatings deposited on AA6061-T6 were evaluated in NaCl 0.01 M aqueous solution at room temperature using Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization (PDP). Coatings microstructure and morphology were observed by Scanning Electron Microscopy (SEM). Coatings compositions were characterized by Energy Dispersive X-Ray Spectroscopy (EDX). The obtained results showed that: 1) Cerium sulphate based coatings possess superior resistance to localized corrosion in comparison to the praseodymium nitrate based ones; 2) One minute of immersion shows good anticorrosive properties of the Ce 2 (SO 4 ) 3 based coatings; 3) Post-deposition phosphate treatment notably improves the anticorrosive behavior and 4) Hydrogen peroxide addition to the cerium based formulation accelerates the coating formation.

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“…At 90 °C and 600 min, the pitting resistance is improved by increasing a perfect passivity domain. Nevertheless, the morphology under these conditions reveals the presence of cracks or pores [30,31], which could affect the performance of the conversion layer for industrial applications, allowing the electrolyte ac-cess to the substrate and hence the beginning of the corrosion process.…”

Section: Tafel Plotsmentioning

confidence: 99%

Rare earth conversion coatings grown on AA6061 aluminum alloys. Corrosion studies.

et al. 2017

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The present work is aimed to investigate the corrosion resistance of rare earth (RE) protective coatings deposited by spontaneous deposition on AA6061 aluminum alloy substrates. Coatings were deposited from water-based Ce(NO3)3 and La(NO3)3 solutions by varying parameters such as rare earth solution concentration, bath temperature and immersion time. The values of the Tafel slopes indicate that the cathodic process is favored by concentration polarization rather than activation polarization.

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Corrosion resistance of cerium-based conversion coatings on alumina borate whisker reinforced AA6061 composite

Cited by 30 publications

References 15 publications

Application of Commercial Surface Pretreatments on the Formation of Cerium Conversion Coating (CeCC) over High-Strength Aluminum Alloys 2024-T3 and 7075-T6

Application of Commercial Surface Pretreatments on the Formation of Cerium Conversion Coating (CeCC) over High-Strength Aluminum Alloys 2024-T3 and 7075-T6

Electrochemical Study of Corrosion Behavior of Rare Earth Based Chemical Conversion Coating on Aerospace Aluminum Alloy

Rare earth conversion coatings grown on AA6061 aluminum alloys. Corrosion studies.

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