Akademik Veri Yönetim Sistemi
SURFACE & COATINGS TECHNOLOGY, cilt.205, sa.6, ss.1793-1798, 2010 (SCI-Expanded, Scopus)
Magnesium alloys are highly reactive and require protection for their successful applications In this work coatings of 10 mu m and 25 mu m nominal thicknesses were prepared by Plasma Electrolytic Oxidation on AM50B and AM60B alloys The effect of subsequent post-PEO treatments such as alkaline phosphate alkaline silicate and sol-gel sealing was studied on coatings with 10 mu m thickness The microstructure and composition of the PEO coatings and post-treated coatings were analysed by Scanning Electron Microscope and Energy Dispersive X ray Spectroscopy Phase analysis of the coatings was carried out using X-ray Diffraction method Potentiodynamic polarization method was used to evaluate the corrosion behaviour of these coatings in 3 5% NaCl solution Electrochemical corrosion results indicated that the sealed PEO coatings of 10 mu m thickness showed better corrosion resistance than the unsealed PEO coatings of 25 mu m thickness The structural surface defects of the PEO coatings were sealed by post-treatments resulting in decreases in surface roughness and open pores Sol-gel post treatment provided the most effective sealing to the PEO coatings (C) 2010 Elsevier B V All rights reserved