Nano nickel ferrite (NiFe2O4) as anti-corrosion pigment for API 5L X-80 steel: An electrochemical study in acidic and saline media

• Electrochemistry of nano nickel ferrite in acidic and saline media.
• Mechanism of protection by metallic ions explained by adsorption.
• Time and concentration dependent anticorrosion properties of nano nickel ferrite pigment.

There have been increased interests in using nanoparticle-based anticorrosion pigments in various industrial applications such as working fluids, lubricants, oil and gas fields, cooling water, anticorrosion coatings etc. In this article, nano-nickel ferrite used as corrosion inhibitor pigment for carbon steel in 1 M sulphuric acid and 3.5% NaCl solutions. The pigment has been characterized using Transmission electron microscopy and X-ray diffraction. Effects of solutions having varying concentrations of the pigment on corrosion response are studied using electrochemical cell via open circuit potential, electrochemical impedance spectroscopy, linear polarization resistance and potentiodynamic methods. Results indicate that the corrosion inhibition is inversely proportional to increasing cations concentrations. Increased corrosion with increasing cations concentration has been attributed to the domination of galvanic corrosion of the steel which occurs via adsorption of metallic cations produced from nickel ferrite such as Ni++ and Fe++. Marked inhibition efficiency can be of significant importance for industries.

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