Abstract
•A novel CoCrO3/PANI composite material was successfully prepared via in situ polymerization.•The protection capacity can be over 98.8% through the CoCrO3 encapsulated in PANI.•CoCrO3/PANI composite constrains CS-1018 better than the pristine PANI.•The CoCrO3/PANI composite has the combined features of low cost, high efficiency, and long-term stability.
Perovskite-type oxide (CoCrO3) was used as a core content of the material to synthesize oxide/PANI nanocomposite. The introduced composite was synthesized by two steps; oxide formation followed by in situ polymerization to cover the oxide surface by the conductive polyaniline polymer (PANI). The as-prepared oxide/PANI material was studied in terms of FE-SEM, TEM, XRD, FT-IR, BET, and XPS analyses. These characterization tools indicate the successful synthesis of a material having oxide and PANI as a composite material. The corrosion protection performance of an oxide/PANI material in a comparison with individual PANI was tested for carbon steel 1018 (CS-1018) in acidified 3.5% NaCl solution. The corrosion protection capacity was determined by LPR corrosion rate, Eocp-time, EIS, and PDP tools. The CoCrO3/PANI composite exhibited high protection capacity around 98.8% at the concentration of 150 mg/L and acted as a mixed type inhibitor i.e., inhibited both anodic and cathodic reactions. The adsorption behavior obeyed the Langmuir isotherm model with competitive physical and chemical adsorption. Surface morphology using FESEM/EDX measurements confirmed the high efficiency of the fabricated CoCrO3/PANI composite on the protection CS-1018 in acidified brine. It was observed that transition metal oxide (CoCrO3) nanoparticles reinforce the barrier and anticorrosive characteristics of PANI. The attained findings indicate that the prepared stabilized system (CoCrO3/PANI composite) is an outstanding inhibitor for CS-1018 corrosion in acidic solutions containing chloride.