Enhancement of the cerium oxide primer layers deposited on AA2024-T3 aircraft alloy by preliminary anodization

  • Stephan V. Kozhukharov LAMAR – Laboratory, University of Chemical Technology and Metallurgy – Sofia, 8 "Kliment Okhridsky" Blvd. 1756, Sofia
  • Christian Girginov Department of Chemical Sciences, University of Chemical Technology and Metallurgy – Sofia, 8 "Kliment Okhridsky" Blvd. 1756, Sofia
Keywords: AA2024-T3 alloy, anodization, Cerium oxide primer layers, Barrier ability, Durability

Abstract

The possibility for combination between Anodized Aluminum Oxide (AAO) and Cerium Oxide Primer Layer (CeOPL) for elaboration of efficient protective coatings for AA2024-T3 aircraft alloy is proposed in the present research. The combined AAO/CeOPL coating characterizations include Electrochemical Impedance Spectroscopy (EIS) combined with Linear Voltammetry (LVA), for extended times (until 2520 hours) to a model corrosive medium (3.5% NaCl). Topographical and cross-sectional (SEM and EDX) observations were performed in order to determine the AAO/CeOPL film thickness and composition. The AAO/CeOPL layer durability tests were confirmed by standard Neutral Salt Spray (NSS). The data analysis from all the used measurement methods has undoubtedly shown that the presence of AAO film significantly improves the cerium oxide primer layer (CeOPL) protective properties and performance. 

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Published
15-05-2018
Section
6th RSE SEE Special Issue