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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.17 [2010] >
IJCT Vol.17(6) [November 2010] >
| Title: | Corrosion behaviour of sol-gel Al2O3 coated Al-Si alloy in 3.5% NaCl solution |
| Authors: | Singh, I B
Singh, M
Das, S
Yegneswaran, A H |
| Keywords: | Al-Si alloy
Composite
Alumina coating
Sol-gel process
Corrosion |
| Issue Date: | Nov-2010 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Alumina sol was
synthesized and coated on Al-Si alloy. The coated substrates were heated at
300ºC for sintering and precursor removal purposes. The cross-sectional
examination of the coated specimens in SEM showed the presence of around 7 μm
thick non porous and compact coating. XRD analysis confirmed the presence of
αAl2O3 in the coated layer. The corrosion characteristics
of the coating were evaluated in 3.5% NaCl solution by electrochemical
measurements. Potentiodynamic polarization and electrochemical impedance
spectroscopy (EIS) analysis indicated that the coated substrate possesses an
order of magnitude higher corrosion resistance as compared to uncoated
substrate. EIS study has also indicated a significant decrease in diffusion
phenomena of chloride ions through the coating/metal interfaces. The effect of
heat treatment of Al-Si alloy on its corrosion properties has also been
investigated. |
| Page(s): | 419-424 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.17(6) [November 2010]
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