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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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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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