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Characterisation and Electrochemical Evaluation of Plasma Electrolytic Oxidation Coatings on Magnesium with Plasma Enhanced Chemical Vapour Deposition Post‐Treatments
Author(s) -
Sun Ming,
Yerokhin Aleksey,
Matthews Allan,
Thomas Michael,
Laukart Artur,
von Hausen Margret,
Klages ClausPeter
Publication year - 2016
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201500059
Subject(s) - plasma electrolytic oxidation , plasma enhanced chemical vapor deposition , corrosion , hexamethyldisiloxane , materials science , electrochemistry , chemical engineering , electrolyte , magnesium , deposition (geology) , metallurgy , chemical vapor deposition , plasma , electrode , chemistry , nanotechnology , paleontology , physics , quantum mechanics , sediment , biology , engineering
Plasma enhanced chemical vapour deposition (PECVD) post‐treatment with three different precursors is employed to improve corrosion resistance of plasma electrolytic oxidation (PEO) coated Mg. Surface morphology, chemical and phase composition are characterised by SEM, EDS, and XRD analyses, whereas corrosion resistance is assessed by electrochemical tests. PECVD post‐treatments can significantly affect PEO coatings, resulting in sealed pores and multi‐layered inner barrier structure. Depending on the precursor, this can have both positive and negative influence on the corrosion resistance of the PEO coatings. The PECVD post‐treatment with hexamethyldisiloxane precursor significantly improves corrosion resistance of PEO coatings, providing the best corrosion protection of Mg.