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Novel polyol(acrylic)-isocyanate-based 2k-polyurethane coatings with embedded nanocomposite matrix for corrosion inhibition application

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Abstract

The present study demonstrates a scalable polyurethane technology based upon a nanocomposite matrix to synthesize high-performance anticorrosion coatings. Systems based on acrylic polyol and modified isocyanate structure chemistry were developed along with the incorporation of functional nanoparticles to develop superior corrosion inhibition coatings. They were subjected to inspection analysis to evaluate basic coatings properties. Moreover, corrosion resistance was evaluated according to standard methods such as salt spray tests (ASTM B117) and modified immersion resistance tests with cyclic exposure (ASTM G31-72). Electrochemical impedance spectra (EIS) analysis was conducted for coatings before and after exposure to compare the system performance post-exposure. Salt spray resistance of coating at 1250-h exposure (for a single coat) was reported with 8.5% surface loss, and the coatings withstood over 500–1000 h of corrosion immersion test (for different formulations). EIS studies before and after immersion of panels also revealed the reasonable extent of retention of low-impedance resistance of coatings, which merely dropped from 4.47 × 108 Ω to 3.16 × 108 Ω for the most durable coating, indicating its retention in the behavior of corrosion resistance in immersion tests. The performance showed promising durability with excellent inhibition corrosion resistance, which is a combined virtue property of functional nanoparticles and cross-linking polyurethane system in the appropriate dosage, that minimizes the contact of the metal substrate with the outer atmosphere to make coatings durable and peel-resistant (higher adhesion) in the different types of harsh environments.

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Acknowledgements

The authors are grateful to Mr. Purvin Shah (Proprietor, P.K. Enterprise, Ahmedabad) for his substantial support of chemicals and the laboratory facilities with machines to synthesize these coatings. In addition, his expertise in functional coatings provided technical guidance to the authors in developing these novel coatings. The authors are also thankful to the Centre for Advanced Instrumentation, Nirma University, for providing an instrument facility for the characterization.

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Authors and Affiliations

  1. Department of Chemical Engineering, Institute of Technology, Nirma University, Ahmedabad, 382481, Gujarat, India

    Parin Shah & Jayesh Ruparelia

  2. Chemical Engineering Department, Pandit Deendayal Energy University, Gandhinagar, 382355, Gujarat, India

    Nikunj Agrawal

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  1. Parin Shah
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  2. Nikunj Agrawal
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Correspondence to Jayesh Ruparelia.

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Shah, P., Agrawal, N. & Ruparelia, J. Novel polyol(acrylic)-isocyanate-based 2k-polyurethane coatings with embedded nanocomposite matrix for corrosion inhibition application. Appl Nanosci 12, 2753–2763 (2022). https://doi.org/10.1007/s13204-022-02580-w

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