Title of article :
EFFECT OF CURRENT DENSITY ON MICROSTRUCTURE AND CORROSION BEHAVIOR OF PURE COBALT COATINGS OBTAINED BY ELECTRODEPOSITION
Author/Authors :
Siadat-Cheraghi، M. نويسنده School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, Tehran, Iran. , , Allahkaram، S. R. نويسنده School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, Tehran, Iran. , , Shahri، Z. نويسنده School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, Tehran, Iran ,
Issue Information :
فصلنامه با شماره پیاپی 45 سال 2015
Pages :
8
From page :
35
To page :
42
Abstract :
Pure cobalt coatings were electrodeposited on copper substrate by means of direct electric current in a chloride solution at different current densities in the range of 10-70 mA cm-2. The surface morphology and microstructure were investigated via X-ray diffraction analysis and scanning electron microscopy. Corrosion behavior of cobalt coatings was also studied in a 3.5 wt% NaCl solution using potentiodynamic polarization and impedance spectroscopy techniques. The results showed that corrosion resistance of deposits was strongly influenced by the coating’s morphology. Co deposit obtained in lower current densities exhibited the highest corrosion resistance, due to their lower grain boundaries and so the least density of active sites for preferential corrosion attacks.
Journal title :
Iranian Journal of Materials Science and Engineering
Serial Year :
2015
Journal title :
Iranian Journal of Materials Science and Engineering
Record number :
2405044
Link To Document :
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