Nanomagnetic fluid, a novel material comprising of ferromagnetic nanoparticles, has been
evaluated as a corrosion inhibitor. Corrosion behavior of carbon steel in 1M H2SO4 has been studied as a function of various concentrations of aqueous nanomagnetic fluid. The novel
nanomagnetic fluid has been specially synthesized to achieve the stability in acidic media
when it is mixed with H2SO4. This nanomagnetic fluid has been evaluated by gravimetric and polarization measurement techniques. It was observed that the inhibition efficiency increases
with the increase in the nanomagnetic fluid concentration and reaches the maximum at the
optimum concentration. This is further confirmed by the decrease in the corrosion rate. It is
found that the system follows a Langmuir adsorption isotherm.
Keywords: nanomagnetic fluid, acid corrosion, polarization