Preparation and anticorrosion performance of nano polyaniline/polyurethane interpenetrating network composite coating

Abstract

PANI‐DBSA particles were synthesized through in‐situ lotion polymerization of aniline (AN) and dodecylbenzene sulfonic acid (DBSA) as raw materials, which followed by combining with epoxy resin (E‐44) and castor oil (CO) to prepare a polyaniline mixture (PANI‐DBSA/CO), which was used as nano filler to create nano polyaniline/polyurethane interpenetrating polymer network(IPN) coating. SEM, XRD, and FTIR were used to characterize the PANI‐DBSA and PANI‐PU interpenetrating network composite coatings that were produced. The coating's physical and mechanical characteristics were investigated, as well as the system's corrosion behavior in 3.5wt% NaCl solution, utilizing electrochemical impedance spectroscopy (EIS) and electrokinetic polarization. Acid, alkali, and salt water immersion investigations were used to further evaluate the coating's medium resistance. The results show that when PANI‐DBSA is added at 1wt%, the contact angle reaches 102.6°, the adhesion reaches S1 grade after 720h immersion, the tensile strength is 16.22MPa and the elongation reaches 208%. The impedance value of the composite coating grew by 569 times with the addition of 1wt% polyaniline, and the resistance duration of 10wt% H2SO4, 10wt% NaOH, and 3.5wt% NaCl reached more than 90 days. The addition of polyaniline to IPN coatings can increase corrosion resistance and extend their application range.This article is protected by copyright. All rights reserved.