Microstructure and Weight Loss Corrosion Studies of Za-27 Metal Matrix Composites Containing Red Mud Particulates

International Journal of Applied Chemistry

© 2017 by SSRG - IJAC Journal

Volume 4 Issue 2

Year of Publication : 2017

Authors : Jayaprakash, H.V., P.V.Krupakara

10.14445/23939133/IJAC-V4I4P104

How to Cite?

Jayaprakash, H.V., P.V.Krupakara, "Microstructure and Weight Loss Corrosion Studies of Za-27 Metal Matrix Composites Containing Red Mud Particulates," SSRG International Journal of Applied Chemistry, vol. 4,  no. 2, pp. 13-16, 2017. Crossref, https://doi.org/10.14445/23939133/IJAC-V4I4P104

Abstract:

This paper deals with the high corrosion resistance developed by the metal matrix composites when compared with that of matrix alloy. Matrix selected is ZA-27 and reinforcement selected is red mud particulates, which is a ceramic material. It is obtained after the removal of aluminium from its ore, procured from Hindalco, Renikoot district, UP. The composites are prepared using liquid melt metallurgy technique using vortex method. Preheated but uncoated red mud particulates are added to the melt. Metal matrix composites containing 2, 4 and 6 weight percentage of red mud are prepared. Matrix was also casted in the same way for comparison. Bar castings are cut into cylindrical discs of 20mm diameter and 20mm thickness. Microstructures of the specimens are taken and studied for uniform distribution of particulates. Corrosion tests were conducted at room temperature (230 C) using conventional weight loss method according to ASTM G69-80. The corrodents used for the tests were 0.025, 0.05 and 0.1 normal solutions of hydrochloric acid, 0.25 M equimolar solutions of sodium chloride and sodium hydroxide. Corrosion rates were calculated using the formula 534DAT/W. In each case the corrosion rate in all corrodents decreases with increase in exposure time for matrix and metal matrix composites. As red mud content increases the composites become corrosion resistant due to insulating nature of ceramic material and less exposure of matrix alloy in those metal matrix composites. Corrosion rate in all concentrations of hydrochloric acid were high when compared to the corrosion rate in equimolar solutions of sodium chloride and sodium hydroxide. Hence the composites are more suitable for the use in saltish or marine environment

Keywords:

Hence the composites are more suitable for the use in saltish or marine environment.

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