Using nanomagnetic fluid for corrosion inhibition of mild steel

Nanomagnetic fluid (ferromagnetic nanoparticles) which has been evaluated as a corrosion inhibitor and the corrosion behavior of carbon steel in 1 M sulfuric acid (H2S04) is discussed. The nanomagnetic fluid was synthesized to achieve stability in acidic media when it is mixed with H2S04 and inhibition followed a Langmuir adsorption isotherm. Magnetic fluids consist of a myriad of ferromagnetic particles coated with dispersant and suspended in a carrier fluid. The chemical co-precipitation technique is used to synthesize iron oxide nanoparticles. The pH of the precipitate was adjusted to 5 with acetic acid (CH3COOH) before coating with citrate ion. All peak positions correspond to the magnetite only. A ferrofluid inhibitor, based on a nanotechnological approach, is used to protect CS from corrosion in acidic media. The adsorption of the ferrofluid on the metal surface deviates from the Langmuir adsorption isotherm, indicating that the adsorbing species occupy more or less than a typical adsorption site at the metal/solution interface.