Abstract
Corrosion is an age-old global issue that demands advanced protection solutions, among which the nanostructured electroactive coatings are getting special attention. Herein, we demonstrated the utilization of waste tea bags as a source for producing nanocrystalline cellulose (NCC) that was further incorporated into the polyaniline (PANI) matrix to synthesize PANI/NCC composites via in situ polymerization of aniline with the addition of NCC dispersed phase. Subsequently, various anticorrosion compositions based on epoxy resin containing different proportions of PANI/NCC were formulated and coated over mild steel substrate. Their corrosion inhibition performance was measured through Tafel polarization curves and electrochemical impedance profiles under saline environment (3.5% NaCl electrolyte). It was observed that the mild steel coated with epoxy having 1.5 wt% loading of PANI/NCC composite showed significantly high corrosion inhibition efficiency (99%), which is ascribed to the combined effect of barrier action of NCC to corrodents (water/oxygen) as well as ennoblization by PANI.
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Acknowledgements
The authors are very thankful to the Director, CSIR-National Physical Laboratory and Principal Miranda House, for their support toward collaborative work Special thanks to CSIR-NPL for financial support through in-house project OLP230432. The authors are also grateful to Dr. Sandeep, Dr. G.A. Basheed, and Dr. Jai Tawale of CSIR-NPL for recording FTIR, XRD, and FESEM data, respectively. Neha and Rahul Saha would like to acknowledge the CSIR, whereas Anuj acknowledges UGC for the fellowship.
Funding
This work was funded by Council of Scientific and Industrial Research, India (Grant Nos. 31/001(0578)/2019-EMR-I, 31/001(0641)/2020-EMR-I), and University Grants Commission (Grant No. 16-6(Dec 2017)2018(NET/CSIR)).
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Neha, Saha, R., Anuj et al. Efficient Anticorrosion Coatings Based on Waste Tea Bags-Derived Nanocrystalline Cellulose-Incorporated Polyaniline Nanocomposites. Trans Indian Inst Met 77, 1373–1379 (2024). https://doi.org/10.1007/s12666-023-03240-5
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DOI: https://doi.org/10.1007/s12666-023-03240-5