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Titanium Duty Cycle Plasma Electrolytic Oxidation Influence on Film Porosity and Corrosion Resistance

Among different form of anodic oxidation on titanium plasma electrolytic oxidation (PEO) is recognized to produce oxide layers up to two orders of magnitude thicker that the ones produced by standard anodization. This treatment increases corrosion resistance in a variety of environments. However the micro-arcs produced during film growth induce nanoporosity in oxide film. This porosity limits oxide barrier effect and allows aggressive species to approach metallic titanium. In this work pulsed signal at different duty cycle values and different frequencies is applied to reduce the energy of each spark and create a smoother surface. The obtained samples are characterized for corrosion resistance in halides rich environment. Process parameters are optimized in order to achieve the best corrosion resistance for each given anodizing potential.

Product Number: 51319-13135-SG
Author: Marco Ormellese
Publication Date: 2019
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