Enhancement of Corrosion Resistance of AA7075 Aluminum Alloy Using Friction Stir Processing for Marine Application

I. Sudhakar; Sasmeeta Tripty; Shashikant V. Athawale; G. Madhusudhan Reddy; K. Srinivasa Rao; Tripti Rathee

doi:10.5750/ijme.v168iA3(S).1958

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Published: Oct 7, 2026

DOI: https://doi.org/10.5750/ijme.v168iA3(S).1958

Keywords:

AA7075 aluminium alloy Friction stir processing Corrosion, Dispersoids Potentio dynamic polarization

I. Sudhakar

Department of Mechanical Engineering, MVGRCE(A), Vizianagaram, India

Sasmeeta Tripty

Institute of Technical Education and Research, Bhubaneswar, India

Shashikant V. Athawale

AISSMS, COE, Pune, India

G. Madhusudhan Reddy

Defence Metallurgical Research Laboratory, Hyderabad, India

K. Srinivasa Rao

Department of Metallurgical Engineering, Andhra University, Visakhapatnam, India

Tripti Rathee

Maharaja Surajmal Institute of Technology Delhi, India

Abstract

AA7075 aluminium alloy comprises major alloying element zinc which forms dispersoids such as Mg(Zn₂AlCu),
Mg₃₂(AlZn)₄₉ and MgZn₂ in the alpha aluminum matrix (α) imparts durability at the expense of inherent corrosion resistance of aluminum. The present investigation aims to study both the influence of friction stir processing and introduction of boron carbide of different sizes on to the AA7075 aluminium alloy. It has been observed that friction stir processed alloy and surface composites produced by reinforcing boron carbide particles on to AA7075 matrix have resulted in improvement of both corrosion resistance and hardness. Dissolution of dispersoids and prevention of formation of galvanic coupling with aluminum matrix (α) may be attributed to above outcomes especially corrosion resistance while as enhancement of hardness contributed to the uniform distribution of boron carbides and reduction in size of dispersoids under the stirring action of friction stir processing.

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Vol. 168 No. A3(S) (2026): Special Issue - Smart and Sustainable Material for Marine Engineering Applications

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