Understanding the behavior of mild steel in sodium hydroxide: a biomass corrosion mitigation approach

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Abstract Aquatic plant biomasses offer the chance to utilize their undesirable organic matter, which disrupts the environment, as environmentally friendly corrosion inhibitors. The corrosion inhibition of mild steel extracts of water hyacinth (Eichhornia crassipes) was synthesized and evaluated. Electrochemical analysis via potentiodynamic polarization technique and gravimetric methodology was used to study the inhibitive effect, followed by optical micrographic evaluation. The inhibitory efficiency of the plant extract was improved by raising the concentration of the aqueous extracts. The water hyacinth had a linear relationship of increasing concentration with the reduction in corrosion rate. The optical micrographs further support less corrosion pitting at high inhibitor concentrations. Extraction method, temperature, and extract dosage were the three criteria examined. Ambient temperature and plant extract dose concentration were ideal circumstances, mainly when high-temperature digestion for extraction was used. Utilizing the optical microscopy (OM) technique, the efficiency of the examined bio-based inhibitor was also confirmed.

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