Abstract
<p class="PaperAbstract"><span lang="EN-US">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. </span></p>
Highlights
The anodization process is well investigated for pure aluminum [1], its highly doped alloys reveal significant deviations from the expected behavior, due to their compositional and structural heterogeneity [2,3,4,5,6,7,8,9]
Performance in a model corrosive medium - The performance of the obtained anodized aluminum oxide (AAO)/cerium oxide primer layer (CeOPL) double layers was determined by electrochemical measurements executed once of week during extended exposition of the investigated samples to 3.5 % NaCl model corrosive medium
The data fitting for these specimens required addition of Warburg element. This fact is an evidence of free diffusion of corrosive species across both the native Al-oxide and CeOPL layers. Both these findings indicated that the directly deposited CeOPL layer does not possess any protective activity after 168 hours of exposure to 3.5 % NaCl model corrosive medium
Summary
The anodization process is well investigated for pure aluminum [1], its highly doped alloys reveal significant deviations from the expected behavior, due to their compositional and structural heterogeneity [2,3,4,5,6,7,8,9]. In the latter case, the intermetallic inclusions entirely predetermine the mechanism and kinetics of both the primer protective layer deposition and the corrosion processes.
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