Vol 6, No 7 (2015) > Metalurgy and Material Engineering >

Corrosion Resistance Enhancement of an Anodic Layer on an Aluminum Matrix Composite by Cerium Sealing

Vika Rizkia, Badrul Munir, Johny Wahyuadi Soedarsono, Bambang Suharno

 

Abstract:

The anodizing process was conducted
in an Al7xxx aluminum alloy with silicon carbide  which yielded a non-uniform thickness of
anodic film with cavities, micro-pores and micro-cracks within it. This
phenomenon occurred due to the presence of Silicon Carbide (SiC) particles
within the Aluminum Matrix Composite (AMC), which impedes the initiation and
growth of the protective anodic alumina oxide layer. Therefore, cerium sealing
has been considered as the cheapest and simplest post treatment to remedy the
poor anodic alumina oxide film in order to further enhance the corrosion
resistance in aggressive circumstances. This paper examined the protection
effect of an integrated layer which was composed of an anodized oxide layer and
cerium deposits on an Al7075/SiC composite. Electrochemical Impedance
Spectroscopy (EIS) was used to examine the corrosion protection effect and the
corrosion behavior of an integrated layer in 3.5% sodium chloride (NaCl)
solution at room temperature. In this study, anodizing of
Al7075/SiC  was carried out in a sulfuric
acid H2SO4 solution at current density values of 15, 20, and 25 mA/cm2,
respectively at room temperature, 0oC and -25oC for 30
minutes. Subsequently, cerium sealing was conducted in a cerium choloride plus
hydrogen peroxide (CeCl3.6H2O + H2O2) solution at room temperature and pH 9 for
30 minutes. The best protection effect was found for Al7075/SiC, anodized at 0oC.
Field Emission-Scanning Electron Microscope (FE-SEM) examination confirmed that
the enhancement of corrosion resistance was due to the cerium deposit formed on
the entire surface of the oxide anodized layer.

Keywords: Aluminum Matrix Composite; Anodizing; Cerium sealing; Corrosion

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