Study of the structure and corrosion behavior of PEO coatings on AM50 magnesium alloy by electrochemical impedance spectroscopy
作者： A. Ghasemi , V.S. Raja , C. Blawert , W. Dietzel , K.U. Kainer
DOI: 10.1016/J.SURFCOAT.2007.12.033
关键词: Plasma electrolytic oxidation 、 Materials science 、 Composite material 、 Electrolyte 、 Alloy 、 Conductivity 、 Dielectric spectroscopy 、 Coating 、 Metallurgy 、 Magnesium alloy 、 Corrosion
摘要: Abstract In this work coatings were developed on the surface of AM50 magnesium alloy using four different electrolytes containing 10 wt.% each K3PO4 and Na3PO4 in combination with either potassium or sodium hydroxides. Electrolyte conductivity breakdown voltage measured order to correlate property coating nature electrolyte. Further, examined scanning electron microscopy for morphology cross sectional investigation, X-ray diffraction phase determination, electrochemical impedance spectroscopy corrosion resistance evaluation. The effect employing ions results morphologies, chemical phases and, consequently, coatings. EIS indicate presence porous compact layers structure PEO coatings, whilst overall mainly from layer, role layer as a barrier against is negligible. Finally, correlation between passive current density bare proposed.
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S. Verdier, M. Boinet, S. Maximovitch, F. Dalard, Formation, structure and composition of anodic films on AM60 magnesium alloy obtained by DC plasma anodising Corrosion Science. ,vol. 47, pp. 1429- 1444 ,(2005) , 10.1016/J.CORSCI.2004.07.038
F. Monfort, A. Berkani, E. Matykina, P. Skeldon, G.E. Thompson, H. Habazaki, K. Shimizu, Development of anodic coatings on aluminium under sparking conditions in silicate electrolyte Corrosion Science. ,vol. 49, pp. 672- 693 ,(2007) , 10.1016/J.CORSCI.2006.05.046
J.E. Gray, B. Luan, Protective coatings on magnesium and its alloys — a critical review Journal of Alloys and Compounds. ,vol. 336, pp. 88- 113 ,(2002) , 10.1016/S0925-8388(01)01899-0
G Sundararajan, L Rama Krishna, Mechanisms underlying the formation of thick alumina coatings through the MAO coating technology Surface and Coatings Technology. ,vol. 167, pp. 269- 277 ,(2003) , 10.1016/S0257-8972(02)00918-0
I. Montero, M. Fernández, J.M. Albella, Pore formation during the breakdown process in anodic Ta2O5 films Electrochimica Acta. ,vol. 32, pp. 171- 174 ,(1987) , 10.1016/0013-4686(87)87028-7
C. Blawert, V. Heitmann, W. Dietzel, H.M. Nykyforchyn, M.D. Klapkiv, Influence of process parameters on the corrosion properties of electrolytic conversion plasma coated magnesium alloys Surface & Coatings Technology. ,vol. 200, pp. 68- 72 ,(2005) , 10.1016/J.SURFCOAT.2005.02.035
A.L. Yerokhin, X. Nie, A. Leyland, A. Matthews, S.J. Dowey, Plasma electrolysis for surface engineering Surface and Coatings Technology. ,vol. 122, pp. 73- 93 ,(1999) , 10.1016/S0257-8972(99)00441-7
M. Tauseef Tanvir, K. Fushimi, K. Shimizu, S. Nagata, P. Skeldon, G.E. Thompson, H. Habazaki, Influence of silicon on the growth of barrier-type anodic films on titanium Electrochimica Acta. ,vol. 52, pp. 6834- 6840 ,(2007) , 10.1016/J.ELECTACTA.2007.04.113
Houng-Yu Hsiao, Hua-Chih Tsung, Wen-Ta Tsai, Anodization of AZ91D magnesium alloy in silicate-containing electrolytes Surface & Coatings Technology. ,vol. 199, pp. 127- 134 ,(2005) , 10.1016/J.SURFCOAT.2004.12.010
JA Curran, TW Clyne, None, Porosity in plasma electrolytic oxide coatings Acta Materialia. ,vol. 54, pp. 1985- 1993 ,(2006) , 10.1016/J.ACTAMAT.2005.12.029