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Abstract

Mixed nickel oxide/chromium oxide nanocomposites NCs (NiO/Cr2O3 NCs) have been synthesized via two distinct routes, the first: a green direct calcination-microwave-assisted route (sample B1) of nickel and chromium salts in a crucible within an enclosed oven chamber, which provides an environmentally friendly approach free of gaseous and fluid waste. The second is a conventional co-precipitation-microwave-assisted technique (sample B2). Both methods produced a novel bio-inspired hierarchical micro-lobed architecture pattern. The corrosion resistance effects of both samples have been studied. NiO/Cr2O3 NCs were characterized using a field emission scanning electron microscope, X-ray diffractometer, EDX-ray spectroscope, and FT-IR Fourier transform infrared. XRD analysis confirmed average crystallite sizes of 22.93 nm (B1) and 23.24 nm (B2), whereas AFM measurements indicated mean particle sizes of 40–45 nm, suggesting well-defined nanocrystals with minimal agglomeration. Despite significant differences in Ni/Cr composition (B1:∼1.3 vs. B2:∼2.3) from EDS, both (NiO/Cr2O3 NCs) were found to have comparable corrosion inhibition efficiencies of ∼82% when carbon steel was added to (0.1) M of HCl. The assessments of electrochemical analysis identified the primary mechanism as the formation of a protective/shielding layer on the steel surface. These findings indicate that anti-corrosion performance is largely governed by barrier formation rather than stoichiometry, validating both synthesis routes as sustainable strategies for designing high-performance NiO/Cr2O3 NCs as anti-corrosion materials, effectively preventing corrosion.

Keywords

Co-precipitation method, Corrosion resistance, Direct calcination method, Metal oxide nanoparticles, Morphological properties, Structural properties

Subject Area

Chemistry

Article Type

Article

First Page

2012

Last Page

2024

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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