Journal
CORROSION SCIENCE
Volume 53, Issue 9, Pages 2700-2712Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2011.04.023
Keywords
Metal matrix composites; EIS; Polarisation; SEM; AFM; Passive films
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The effect of boron carbide (B4C) reinforcement on the corrosion of AA6061 alloy was studied by investigating passive films formed in seawater. The higher passive current and its potential-dependence for these composites indicated formation of porous passive film. Electrochemical impedance spectroscopy (EIS) graph suggests that the alloy surface is partly or totally active. The formed passive film is n-type semiconductor junction in nature. The difference between corrosion potential (E-corr) and potential at zero charge (RC) suggests that the chloride ions responsible for film breakdown exist within the passive film. A suitable mechanism is proposed for the passive film breakdown. (C) 2011 Elsevier Ltd. All rights reserved.
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