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Ecological awareness brought adequate innovations in the corrosion prevention technology in the last decade. Plant extracts are an interesting category among them, being the rich source of phytochemicals explored as corrosion inhibitors in various electrolytic media instead of toxic synthetic materials. Herein, the most ample tropical plant Mangifera indica L. leaf (MIL) extract was prepared, and its antioxidant ability has been utilized for corrosion prevention of commercial steel in 3.5 wt % NaCl environment. A rich source of polyphenol content provided excellent anticorrosive property. Corrosion prevention occurs by forming an insoluble organometallic complex between metal ions and functional groups in the antioxidants at the metal–electrolyte interface. A new simple strategy is adopted here to make bio-extract containing epoxy coating on steel. An MIL-precipitated amorphous silica hybrid is incorporated in epoxy coating. Electrochemical measurement demonstrated that the developed coating has a superlative corrosion inhibition efficiency of 99%. Thus, the present findings demonstrate a novel environmentally benign, efficient corrosion inhibitor for steel protection in saline media.

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Here, we present a new eco-friendly cerium phosphate (CP) nanorod system that can be utilized as an anticorrosive pigment to protect steel from corrosive environment. Among the various formulations studied, CP nanorod (10 wt %) loaded epoxy exhibited the best corrosion resistance efficiency. The anticorrosion property of the coating was further improved by the introduction of hydrophobicity through siliconization process. This enhanced the average surface roughness (R a = 0.4–11 nm) and consequently generated hydrophobic contact angle of 121°. A 3-fold increase of the corrosion resistance of epoxy is attributed to the synergistic effect of the hydrophobic surface and nanorod morphology. The durability of the coating was also studied by an electrochemical method for the duration of two months. The enhanced corrosion inhibition efficiency and durability of the developed coating can be of significant importance for industrial applications.