Integrated framework for designing durable green corrosion inhibitors from Spirulina: Cultivation, extraction, and electrochemical evaluation
Ana Fonseca, Lizeth Gutierrez Pua, Alejandra M. Miranda, Fabian Hernandez-Tenorio, Alex A. Sáez, Yaneth Pineda Triana
TL;DR
This study shows how to create eco-friendly corrosion inhibitors from Spirulina, with high efficiency and durability over time.
Contribution
A reproducible framework for producing and evaluating green corrosion inhibitors from Spirulina biomass is introduced.
Findings
Dry-biomass ultrasound-assisted extract achieved 90-92% inhibition efficiency.
Corrosion rate was reduced to ∼1.41 mm/year at 1,000 ppm concentration.
Inhibition efficiency remained at ∼77% after 72 hours of immersion.
Abstract
This study presents a comprehensive framework for designing eco-friendly corrosion inhibitors from Spirulina platensis. Biomass production was optimized for yield and quality, followed by selective extraction using ultrasound-assisted and orbital-shaking methods applied to wet and dry biomass. Extracts were chemically characterized and tested via potentiodynamic polarization and electrochemical impedance spectroscopy. The dry-biomass ultrasound-assisted extract (D1) showed the highest inhibition efficiency (90%–92%) and achieved a corrosion rate of ∼1.41 mm year−1 at 1,000 ppm, maintaining ∼77% efficiency over 72 h. Statistical analysis confirmed that the presence of Spirulina extracts significantly improved corrosion resistance, with extract type, concentration, and immersion time identified as key variables. This work validates the potential of microalgal formulations as effective…
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Taxonomy
TopicsCorrosion Behavior and Inhibition · Hydrogen embrittlement and corrosion behaviors in metals · Concrete Corrosion and Durability