Electrochemical and Mechanical Properties of the PVDF/PEO-Coatings on Magnesium Alloy

Abstract:

The paper presents the results of the study of electrochemical and mechanical properties of PVDF/PEO-coatings formed on magnesium alloy MA8 by plasma electrolytic oxidation (PEO) and subsequent application of polyvinylidene fluoride (PVDF) on the PEO-layer. The oxide coatings were formed using a 300 Hz bipolar signal with duty cycle (D) 0.50. The analysis of electrochemical data has showed a decrease of corrosion currents by 3 orders of magnitude (down to 6.0·10^-9 А·сm^-2) and an increase of the polarization resistance by 3 orders of magnitude (up to 5.3·10⁶ Оhm·сm²) for the coatings formed by triple dipping (x3) of the PEO-layers into PVDF solution. Evaluation of the tribological properties of the (x3) PVDF/PEO-coatings has showed a significant increase of the wear resistance (the number of abrasion cycles resulting in complete destruction of the coating increased in 25 times) as compared to the base PEO-layer.

• Periodical: Solid State Phenomena (Volume 245)
• Pages: 130-136
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.245.130
• Online since: October 2015
• Authors: Vladimir S. Egorkin, Igor E. Vyaliy, Denis Opra, Sergey L. Sinebryukhov*, Sergey V. Gnedenkov
• Keywords: Duty Cycle, Electrochemical Impedance Spectroscopy, Magnesium, Plasma Electrolytic Oxidation, Polyvinylidene Fluoride, Protective Coatings

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