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Comparison of cellulose nanocrystal (CNC) filler on chemical, mechanical, and corrosion properties of epoxy-Zn protective coatings for mild steel in 3.5% NaCl solution

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Abstract

This present work evaluated the influence of oil palm frond cellulose nanocrystal (OPF-CNC) as a nanofiller to improve the barrier protection of the epoxy-Zn coating to lessen the corrosion. Herein, the epoxy-Zn coatings loaded with varying ratios of OPF-CNC (0.5–10.0 wt%) were prepared. The ATR analysis revealed the main peaks at 3450 cm−1 and 1030 cm−1 proving the crosslinking network between the epoxy group and the OPF-CNC group. The hardness value of the epoxy-Zn coating was intensified 36% higher than the commercial coating by the inclusion of 0.5 wt% OPF-CNC. The anticorrosion performance of the coatings exposed to 3.5 wt% NaCl were evaluated via electrochemical measurements, salt spray, and AFM analyses. The OCP measurements confirmed that the coated mild steel with 0.5 wt% OPF-CNC is the least susceptible to corrode, offering the highest corrosion protection. Impressively, the coated mild steel managed to remarkably inhibit corrosion in high-temperature conditions at the highest performance (93–99%). The coated mild steel also demonstrated the formation of the least rust and no blistering after the 24-h salt spray test. The improved corrosion resistance was in accordance with AFM analysis, depicted a low surface roughness after a 7-day immersion period.

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Acknowledgments

The financial support for this present work is supported by Universiti Sains Malaysia Research University Incentive, RUI grant (1001/PKIMIA/8011077). Nur Fatin Silmi Mohd Azani would like to express the utmost gratitude to USM for the USM Fellowship scheme given.

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NFSMA: Methodology, Investigation, Software, Formal analysis, Writing- original draft, Visualisation. MHH: Conceptualization, Supervision, Project administration, Finding acquisition, Software, Validation, Resources, Data curation.

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Correspondence to M. Hazwan Hussin.

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The authors declare that there is no conflict of interest. No animal studies or human participants involved in the study. All authors have participated in (a) conception and design, or analysis and interpretation of the data; (b) drafting the article or revising it critically for important intellectual content; and (c) approval of the final version. The authors have no affiliation with any organization with a direct or indirect financial interest in the subject matter discussed in the manuscript.

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Azani, N.F.S.M., Hussin, M.H. Comparison of cellulose nanocrystal (CNC) filler on chemical, mechanical, and corrosion properties of epoxy-Zn protective coatings for mild steel in 3.5% NaCl solution. Cellulose 28, 6523–6543 (2021). https://doi.org/10.1007/s10570-021-03910-x

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  • DOI: https://doi.org/10.1007/s10570-021-03910-x

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