Polyaniline‐grafted polyurethane coatings for corrosion protection of mild steel surfaces

Abstract

We report the superior corrosion-resistant properties of conducting polyurethane networks of polyaniline (PANI), polym-aminophenol (PmAP), and poly-o-anisidine (PoA) coated on mild steel panels. These networks were prepared by blending conducting polyanilines with isocyanate-containing prepolyurethanes. Free-standing polyurethane films were obtained after a moisture cure for several days to ensure complete reaction of the excess isocyanate. The films were electrochemically active with conductivity in the range of 10 22 to 10 23 S/cm. The solution blends and formed films were characterized by infrared, ultraviolet, thermogravimetric analysis, and differential scanning calorimetry. Electrochemical corrosion studies of the coated films on mild steel panels showed excellent corrosion protection in the following order: PU-PANI > PU-PmAP > PU-PoA. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45806.

Polyurethane: Recent Engineering Contributions

“…A study of a PU network of polyaniline, polym-amino phenol and poly-α-anisidine coated on a mild steel panel was reported. The coated films showed excellent corrosion protection in the following order: PU-polyanilin>PU-poly-m-aminophenol>PU-poly-α-anisidine [32].…”

Modification of ZSM‐5 zeolite nanoparticles by graphene oxide to improve anticorrosion properties of polyurethane coating

“…[25][26][27][28] Polyurethanes (PUs), based on their excellent physical and chemical properties, are extensively used as coatings to protect the underneath substrates. [28][29][30][31][32] They are widely used in different industries, daily life, medical section and aerospace industry. However, polyurethanes have some drawbacks.…”

Preparation of polyaniline/cellulose nanofiber composites with enhanced anticorrosion performance for waterborne epoxy resin coatings

“…However, these conventional coatings contain volatile organic compounds (VOCs), which are considered to be detrimental for the environment and human health. [4][5][6][7] In recent years, with increasing restrictions on VOCs, eco-friendly waterborne coatings have gained increasing attention. [8,9] During the curing process of traditional single waterborne coatings, numerous microporous crevices will be formed inside and on the surface of the coatings with the volatilization of water solvent, [10] which usually leads to the reduction of their corrosion resistance performances.…”