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<p>This study examines the corrosion behavior of graphene oxide (GO)-reinforced aluminum alloy 6061 (Al6061) multilayer composites fabricated via accumulative roll bonding (ARB). The corrosion performance was systematically evaluated in acidic, alkaline, neutral, and saline environments using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and long-term immersion (weight loss) testing. Results indicate that ARB processing alone enhanced corrosion resistance, reducing the corrosion rate from 0.7634&#xa0;mm/year (as-received Al6061) to 0.1597&#xa0;mm/year after five passes. With the incorporation of 0.2 wt.% GO (6G02/5), the corrosion rate further dropped to 0.0859&#xa0;mm/year, reflecting an overall reduction of approximately 89%. EIS analysis revealed increased charge transfer resistance and larger Nyquist semicircles, confirming improved passive film stability. Bode plots and equivalent circuit fitting further supported these findings. Immersion tests demonstrated enhanced durability of GO-reinforced composites, particularly in aggressive media such as 0.5 M HCl and artificial seawater. The superior corrosion resistance is attributed to the combined effects of ARB-induced grain refinement and the barrier properties of GO, which collectively inhibit chloride ion penetration and promote the formation of a stable passive oxide layer. These findings highlight the potential of GO-reinforced ARBed Al6061 composites for use in marine, structural, and automotive applications demanding long-term corrosion resistance.</p>

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Corrosion Behavior of GO-Reinforced Multilayer Al6061 Composite Fabricated by Accumulative Roll Bonding

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Vijay Pratap Singh,
  • Gaurav Kumar Gupta,
  • Srinibash Mishra

摘要

This study examines the corrosion behavior of graphene oxide (GO)-reinforced aluminum alloy 6061 (Al6061) multilayer composites fabricated via accumulative roll bonding (ARB). The corrosion performance was systematically evaluated in acidic, alkaline, neutral, and saline environments using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and long-term immersion (weight loss) testing. Results indicate that ARB processing alone enhanced corrosion resistance, reducing the corrosion rate from 0.7634 mm/year (as-received Al6061) to 0.1597 mm/year after five passes. With the incorporation of 0.2 wt.% GO (6G02/5), the corrosion rate further dropped to 0.0859 mm/year, reflecting an overall reduction of approximately 89%. EIS analysis revealed increased charge transfer resistance and larger Nyquist semicircles, confirming improved passive film stability. Bode plots and equivalent circuit fitting further supported these findings. Immersion tests demonstrated enhanced durability of GO-reinforced composites, particularly in aggressive media such as 0.5 M HCl and artificial seawater. The superior corrosion resistance is attributed to the combined effects of ARB-induced grain refinement and the barrier properties of GO, which collectively inhibit chloride ion penetration and promote the formation of a stable passive oxide layer. These findings highlight the potential of GO-reinforced ARBed Al6061 composites for use in marine, structural, and automotive applications demanding long-term corrosion resistance.