resumo
Anodic coatings on magnesium ZE41 alloy were formed by DC plasma electrolytic oxidation (PEO) in spark regime in solution composed of NaOH, Na2SiO3 and KF. The positive effect of poly(ethylene oxide) addition into the anodizing electrolyte on PEO process, anodic film porosity and its protective performance was described. Anodic films were sealed with hybrid epoxy-silane formulation. The corrosion behavior of the coated ZE41 was studied through electrochemical impedance spectroscopy (EIS) in 0.6 M NaCl solution. Resulting duplex PEO/epoxy-silane coating provides good protective performance without significant signs of corrosion during 1 month of immersion test. (C) 2013 Elsevier Ltd. All rights reserved.
palavras-chave
MICRO-ARC OXIDATION; AZ31B MG ALLOY; ELECTROLYTIC OXIDATION; CORROSION-RESISTANCE; CERAMIC COATINGS; PEO COATINGS; LI ALLOY; SURFACE; MICROSTRUCTURE; PROTECTION
categoria
Materials Science; Metallurgy & Metallurgical Engineering
autores
Ivanou, DK; Starykevich, M; Lisenkov, AD; Zheludkevich, ML; Xue, HB; Lamaka, SV; Ferreira, MGS
nossos autores
Aleksey Lisenkov
Investigador Júnior
Maksim Starykevich
Investigador Júnior
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal ConvidadoProjectos
Fault-tolerant anticorrosion coatings for magnesium alloys (PTDC/CTM-MET/112831/2009)
RMNE-UA-National Network of Electron Microscopy (REDE/1509/RME/2005 )
agradecimentos
Portuguese Foundation for Science and Technology (FCT), project Fatomag, PTDC/CTM-MET/112831/2009 and REDE/1509/RME/2005. EADS Innovation Works, Munich, for supplying the alloys.