Corrosion-Resistant Polyaniline-Coated Zinc Tungstate Nanocomposites with Enhanced Electric Properties for Electromagnetic Shielding Applications

• Published in: Macromolecular research Vol. 30; no. 9; pp. 638 - 649
• Main Authors: Abdul Kadar, C. H., Faisal, Muhammad, Maruthi, N., Raghavendra, Narasimha, Prasanna, B. P., Manohara, S. R.
• Format: Journal Article
• Language: English
• Published: Seoul The Polymer Society of Korea 01.09.2022; Springer; Springer Nature B.V; 한국고분자학회
• Subjects: Absorption spectroscopy; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Corrosion; Corrosion prevention; Corrosion resistance; Corrosion resistant steels; Diffraction; Dispersants; Dispersion; Effectiveness; Electric properties; Electrical conductivity; Electrical properties; Electrical resistivity; Electromagnetic interference; Electromagnetic shielding; Electromagnetism; Fourier transforms; Impedance spectroscopy; Infrared analysis; Infrared spectroscopy; Low carbon steels; Nanochemistry; Nanocomposites; Nanotechnology; Physical Chemistry; Polarization; Polyanilines; Polymer Sciences; Polymerization; Raman spectroscopy; Scanning electron microscopy; Soft and Granular Matter; Spectrum analysis; Steel; Superhigh frequencies; Technology application; X-rays; Zinc coatings; Zinc tungstates; 고분자공학; nanocomposite; electric properties; Raman spectroscopy; anticorrosion behavior; EMI shielding
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-022-0067-z

This paper presents the suitability of polyaniline/zinc tungstate (PANI/ZnWO 4 ) nanocomposites with tunable electrical properties for a range of multifunctional applications. In-situ oxidative polymerization method was employed to synthesize the PANI/ZnWO 4 nanocomposites with different mass percentages of the dispersant ZnWO 4 (10%, 20%, 30%, and 40%). The structural features of the samples were analyzed using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy, and Raman spectroscopy techniques. Frequency-dependent electrical conductivity studies and dielectric responses were investigated for PANI/ZnWO 4 nanocomposites in the range of 100 Hz — 1 MHz. PANI/ZnWO 4 nanocomposites showed tunability in the observed high dielectric constant owing to the conductivity relaxation with varying dispersant concentrations. The electromagnetic interference shielding effectiveness (EMI-SE) of the PANI/ZnWO 4 nanocomposites were found to be increased from −14 dB to −21 dB with enhancing wt% of ZnWO 4 in the PANI matrix. The composite samples displayed practically relevant shielding effectiveness in the entire microwave, X-band covering 8 to 12 GHz. The overall attenuation of the incident EM energy was around 99%, which is highly suitable for diverse EMI shielding applications. The nature of mild steel (MS) metal corrosion in 5 M HCl solution in the unprotected and protected system was studied by using SEM, AC impedance spectroscopy, potentiodynamic polarization (Tafel plots), and atomic absorption spectroscopy (AAS) techniques. The preliminary results indicate the mixed-type anticorrosion behavior. The AAS, AC impedance spectroscopy, and SEM results support the potentiodynamic polarization results.