Electrochemical Behavior of Aluminum-Molybdenum Surface Composites Developed by Friction Stir Processing

Grain size and particle distribution in surface composites as function of RPM

Abstract

Aluminum alloys find application in aerospace, automobile, and structural sectors. However, these alloys are susceptible to corrosion attack in chloride environments. Introducing a second species on the surface by surface composite fabrication can be a way to increase the corrosion resistance of the aluminum alloys. Here, we present corrosion studies on aluminum matrix surface composites fabricated using friction stir processing. The reinforcement of Mo particles is considered with varying percentage and distribution in the surface composite. The particle content and distribution are analyzed using SEM–EDS and optical image analysis. Based on the potentiodynamic polarization analysis, the surface composites exhibit improved corrosion resistance with higher corrosion potential and lower corrosion rate. Increase in corrosion resistance is observed for higher Mo content with homogenous distribution. While the base alloy exhibit mixed corrosion behavior, the surface composites show charge-transfer controlled corrosion behavior in the Electrochemical Impedance Spectroscopy. Reduced pitting in the Mo-rich areas is confirmed by microscopic analysis of the corroded material.

Publication
Journal of Materials Engineering and Performance, 2021
V.P. Mahesh, J. Alphonsa & A. Arora. Microstructural Modification and Surface Hardness Improvement in Al-Mo Friction Stir Surface Composites. J. of Materi Eng and Perform (2020). https://doi.org/10.1007/s11665-021-06050-2
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Mahesh V.P.
Research Associate

Mahesh works on surface composites fabrication using friction stir processing. His major focus is on the electrochemical and mechanical behavior of Aluminium matrix surface composites. He also performs tribological analysis of metal matrix composites. Other major fields of interest are liquid metal stir casting, centrifugal casting and functionally graded materials (FGM).

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