Created with Sketch.

4. Jun 2020 | Coatings Technologies

Polyethylenimine-assisted exfoliation of h-BN in aqueous media

Researchers have investigated the polyethylenimine-assisted exfoliation of h-BN in aqueous media for anticorrosive reinforcement of water-borne epoxy coating.

Corrosion.

PEI-BNNSs can significantly enhance the corrosion resistance of waterborne epoxy coatings. Image source: ende11.photo – stock.adobe.com (symbol image).

In the study h-BN powders were sonicated in an aqueous solution of polyethylenimine (PEI) to simultaneously exfoliate and functionalise h-BN nanosheets with Lewis acid-base interaction.

Enhancing the corrosion resistance

The structure and morphology of PEI modified h-BN nanosheets (PEI-BNNSs) were characterised by FTIR, TGA, AFM and TEM. The as-prepared PEI-BNNSs were served as anticorrosive nanofillers for waterborne epoxy (EP) coatings on Q235 carbon steel. The corrosion behaviors of EP and PEI-BNNSs/EP coating systems in 3.5 wt % NaCl aqueous solution were evaluated by electrochemical workstation.

It is worth noting that the protection efficiency (PE) values of 1 wt % PEI-BNNSs/EP and 2 wt % PEI-BNNSs/EP coating systems are as high as 99.99 % compared to EP coating systems. Moreover, the impedance modulus (|Z|f = 0.01 Hz) of the 1 wt % PEI-BNNSs/EP coating system was 3–4 orders of magnitude higher than the EP coating after 90 days of immersion.

The electrochemical results revealed that PEI-BNNSs can significantly enhance the corrosion resistance of waterborne epoxy coatings.

The study has been published in Progress in Organic Coatings, Volume 142, May 2020.

EC Library The Rheology Handbook

Books

The Rheology Handbook

Already in its 5th edition, this standard work describes the principles of rheology clearly, vividly and in practical terms. The book includes the rheology of additives in waterborne dispersions and surfactant systems. Not only it is a great reference book, it can also serve as a textbook for studying the theory behind the methods. The practical use of rheology is presented in the areas quality control, production and application, chemical and mechanical engineering, materials science and industrial research and development. After reading this book, the reader should be able to perform tests with rotational and oscillatory rheometers and interpret the results correctly.

This could also be interesting for you!

0 Comments

You are currently not logged in

To leave a comment, please log in.

Login
For continuously improving and optimizing our websites, we use cookies. By using our website, you agree to the usage of cookies. For more information, please visit our Privacy policy.
Accept