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

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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.

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Acknowledgment

The authors would like to acknowledge the support of Central Instrumentation Facility at Indian Institute of Technology Gandhinagar, and Institute of Plasma Research, Gandhinagar. Two of the authors would like to acknowledge the Board of Research in Nuclear Sciences (BRNS) (Grant: 57/14/05/2019-BRNS) and Science and Engineering Research Board (SERB) (File No: CRG/2018/004944) for the financial support.

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Authors and Affiliations

  1. Advanced Materials Processing Research Group, Materials Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat, 382355, India

    V. P. Mahesh & Amit Arora

  2. Metallurgical and Materials Engineering, Punjab Engineering College (Deemed to be University), Chandigarh, 160012, India

    V. P. Mahesh

  3. Institute for Plasma Research, Gandhinagar, Gujarat, 382428, India

    J. Alphonsa

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  1. V. P. Mahesh
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  2. J. Alphonsa
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Correspondence to Amit Arora.

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Mahesh, V.P., Alphonsa, J. & Arora, A. Electrochemical Behavior of Aluminum-Molybdenum Surface Composites Developed by Friction Stir Processing. J. of Materi Eng and Perform 30, 8663–8676 (2021). https://doi.org/10.1007/s11665-021-06050-2

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  • DOI: https://doi.org/10.1007/s11665-021-06050-2

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