INTRODUCTIONProtection of metal from corrosion under lower pH condition during the operation such as pickling, cleaning, descaling, etc. is effected by the usage of inhibitors [1][2][3]. Addition of inhibitors reduces the loss of dissolution of metals, due to aggressive acidic environment adopted in the maintenance processes. The flow of corrosion current is minimized at the interface due to the suitable environment created upon the addition of inhibitors [4,5]. Inhibitors act as a barrier between the metal surface and its environments. The additional burden posed on industries like chemical plants, steel plants, sugar mills, power plants, oil and water pipe lines maintaining units are reduced considerably by safe guarding the machinery parts made of metals from corrosion [6,7]. Reduction in the oxidation rate of anode or reduction rate of cathode or both are reported by the usage of inhibitors [8]. Most of the potential corrosion inhibitors possess an active functional group [9] such as =NH, -N=N-, -CHO, R-OH, -NO2, etc. Presence of oxygen, sulphur and especially nitrogen as heteroatom in the carbon chain reduces corrosion attack [10][11][12]. Conducting nature of polymers offer better corrosion inhibition efficiencies than simple organic compounds [13][14][15][16].Polymerization of aniline along with nanoparticle size of strontium zinc zirconium ferrite (mixed metal oxide) powder using ammonium persulfate as an oxidizing agent at 0 ºC gives water soluble strontium zinc zirconium hexaferrite-polyaniline composite. Dodecylbenzene sulfonic acid was used as dopant and surfactant for the synthesis. Weight loss measurements, Tafel plot analysis and AC impedance measurement revealed that the synthesized material can act as good corrosion inhibitor in half molar and one molar acidic conditions at room temperature. Continuous measurement of open-circuit potential (OCP) also reflect the inhibition efficiency. Prepared composite acts as an effective pickling/corrosion inhibitor.
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