Characterisation and corrosion behaviour of plasma electrolytic oxidation coatings on high pressure die cast Mg-5Al-0.4Mn-xCe (x=0, 0.5, 1) alloys


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Muhaffel F., MERT F., Çimenoğlu H., Hoeche D., Zheludkevich M. L. , Blawert C.

SURFACE & COATINGS TECHNOLOGY, vol.269, pp.200-211, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 269
  • Publication Date: 2015
  • Doi Number: 10.1016/j.surfcoat.2014.12.057
  • Title of Journal : SURFACE & COATINGS TECHNOLOGY
  • Page Numbers: pp.200-211
  • Keywords: Plasma electrolytic oxidation, Magnesium alloy, Corrosion behaviour, MICRO-ARC OXIDATION, AZ91D MAGNESIUM ALLOY, PEO COATINGS, SILICATE, MICROSTRUCTURE, RESISTANCE, FILMS, PERFORMANCE, SURFACE, TIO2

Abstract

In the present study, the influence of minor cerium (Ce) additions (up to 1 wt.%) to AM50 magnesium alloy on the plasma electrolytic oxidation (PEO) process and the corrosion performance of the PEO coatings were studied. Therefore, a silicate-based PEO coating was deposited on AM50 containing 0, 0.5 and 1 wt.% Ce under the same processing conditions. The resulting surface morphology, cross-sectional microstructure, phase and chemical compositions of the coatings were determined using scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction analyses (XRD). The corrosion behaviour of the coatings was evaluated by salt spray and electrochemical corrosion tests.