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Electropolishing of Al-7Si-0.3Mg Cast Alloy by Using Perchloric and Nitric Acid Electrolytes

Murali, S and Ramachandra, M and Murthy, KSS and Raman, KS (1997) Electropolishing of Al-7Si-0.3Mg Cast Alloy by Using Perchloric and Nitric Acid Electrolytes. In: Materials Characterization, 38 (4-5). pp. 273-286.

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The aim of the present study was to find a good method for electropolishing Al-7Si-0.3Mg cast alloy. Consideration of the fundamental current density-voltage relation and limiting current density has made it possible to identify an optimum applied voltage for good electropolishing through variation of different parameters (electrolyte, bath temperature, electrode distance, surface roughness before polishing, cathode material, etc.). The significant findings of the present study are that (1) using 30% perchloric acid + 20% glycerol moderator + 50% methanol electrolyte, (2) maintaining 15 mm electrode distance and a temperature of $-33^0C$, and (3) electropolishing the Al- Si-0.3Mg cast alloy at 15 V for 2 minutes reveal the microstructures clearly. The limiting current density is about $7 mA/cm^2$ for the preceding conditions for attaining good electropolishing. Electropolishing can also be achieved under the same conditions even at room temperature $(26^0C)$, but the clarity of the microstructure is not as good as that obtained through electropolishing at -33°C.

Item Type: Journal Article
Publication: Materials Characterization
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 10 Apr 2007
Last Modified: 19 Sep 2010 04:36
URI: http://eprints.iisc.ac.in/id/eprint/10350

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