화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.53, 213-227, September, 2017
DOI10.1016/j.jiec.2017.04.027  Export Citation
Role of lanthanum nitrate in protective performance of PEO/epoxy double layer on AZ31 Mg alloy: Electrochemical and thermodynamic investigations
M. Toorani, M. Aliofkhazraei†, R. Naderi1, M. Golabadi, and A. Sabour Rouhaghdam
  • Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran
  • 1School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
E-mail:
Direct current Plasma Electrolytic Oxidation (PEO) in a bath containing lanthanum nitrate, as pretreatment was performed on the AZ31 magnesium alloy. Incorporation of lanthanum in PEO coating was proved by SEM/EDS analysis. Fabricated oxide coatings were sealed with an epoxy layer. The role of lanthanum nitrate in the protective properties of the fabricated double top layer and its effective mechanism were investigated using electrochemical techniques and thermodynamic calculations. The double layer coatings containing lanthanum nitrate provided better protective properties in comparison to La-free double layer coating without any degradation after 42 days of immersion in 3.5% NaCl solution.
Keywords:EIS;Thermodynamic;Plasma Electrolytic Oxidation;Magnesium;Epoxy
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