Open Access. Powered by Scholars. Published by Universities.®
<p>Aluminum alloys<br />Cerium -- Electrometallurgy<br />Coating processes<br />Electrochemical analysis<br />Surfaces (Technology)</p>
Articles 1 - 1 of 1
Full-Text Articles in Engineering
Electrochemical Characterization Of Cerium-Based Conversion Coatings On Al 7075-T6, Simon Joshi
Electrochemical Characterization Of Cerium-Based Conversion Coatings On Al 7075-T6, Simon Joshi
Doctoral Dissertations
"This research used electrochemical techniques to characterize the deposition and corrosion protection behavior of cerium-based conversion coatings on AI 7075-T6. Alkaline activation decreased native oxide impedance (5.9 kΩ-cm²) by ~25% promoting deposition of 250-500 mn coatings. Activation in NaOH solutions deposited coatings with large cracks and craters, whereas Na₂C0₃ activation resulted in uniform coatings, i.e., fewer cracks and almost no craters. Uniformly deposited coatings exhibited better cathodic inhibition and higher impedance (~200 kΩ-cm²) than on NaOH activated substrates (~100 kΩ-cm²). Subsurface crevices, caused by Cl⁻ and H₂O₂ in the deposition solution, were found under large cracks and craters. Thus, Na₂CO₃ …