Author:
Castano Carlos E.,Maddela Surender,O'Keefe Matthew J.,Wang Yar-Ming
Abstract
In the present work a comparative study has been carried out on the surface morphology, electrochemical properties and corrosion performance of cerium-based conversion coatings (CeCCs) on AZ91D and AZ31B magnesium alloys. The as-deposited coatings consisted of a two layer structure: a continuous Mg/Al oxide transition layer of ~ 50 nm thick and a CeCC layer of ~ 400 nm thick. Potentiodynamic polarization and impedance spectroscopy results using a 0.6 wt% NaCl and 0.6 wt% (NH4)2SO4 electrolyte showed that cerium-based conversion coatings enhanced the corrosion resistance of AZ91D and AZ31B magnesium alloys compared to polished uncoated samples. Good correlation of electrochemical test and ASTM B117 salt spray was realized.
Publisher
The Electrochemical Society
Cited by
20 articles.
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