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Electrochemical Properties of Microarc Oxidation Films on a Magnesium Alloy Modified by High-intensity Pulsed Ion Beam by Han X.G., Zhu X.P., Lei M.K. is a nonfiction available to read on EtoBox.

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Elseiver. Surface & Coatings Technology xxx (2011) xxx–xxx Microarc oxidation (MAO) films on AZ31 magnesium alloy were treated by high-intensity pulsed ion beam (HIPIB) irradiation with ion energy of 300 keV at ion current density of 200 A/cm 2. A remelted layer of a few micrometers was produced on irradiated MAO films. The corrosion resistance of MAO films was characterized by potentiodynamic electrochemical test in 3.5% NaCl solution. The anodic polarization behavior of MAO samples exhibited a transition from the active anodic dissolution for the original one to the passivation–pitting breakdown for the modified films. The passivation–pitting breakdown voltage of modified films increased with multi-shot irradiation, i.e. from a value of −1420 mV(SCE) at 1 shot to −800 mV(SCE) at 5 shots, and the corresponding passivation current density decreased by two orders of magnitude. The irradiated MAO films have a higher corrosion potential than the original one, reaching a maximal value of −1350 mV(SCE) at 5 shots from the original −1580 mV(SCE). The electrochemical impedance spectrum (EIS) of modified MAO films was measured with varying the immersion time in 3.5% NaCl solution. The Nyqu

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Author

Han X.G., Zhu X.P., Lei M.K.

Language

EN

Category

nonfiction

Subjects

Engineering, Mechanical Engineering & Dynamics, Stem