The effect of Spirulina sp as green corrosion inhibitors on mild steel in 0.2M sulphuric acid solution / Mohamad Al-Amir Mohamad Sabri

Nowadays, extensive and persistent corrosion has serious financial and social consequences. As a result, greater effort must be put into preventing corrosion. Corrosion is typically stopped or slowed with the help of inorganic and synthetic metal corrosion inhibitors; however, these compounds are extremely dangerous. An obvious answer to this problem could be found in green corrosion inhibitors, which are both cheap and gentle on the planet. The ability of the green microalgae Spirulina sp. to prevent mild steel from corroding in sulphuric acid (H2SO4) was investigated in this study. Furthermore, the effectiveness of Spirulina sp. as a corrosion inhibitor was investigated using the gravimetric method and thermodynamic analysis. The results showed that the maximum inhibition efficiency (IE%) was achieved when 0.1gL of the Spirulina sp. biomass was used to treat mild steel corrosion. However, performance of Spirulina sp. and Chlorella sp. were contrasted. As a result, Chlorella sp. more performed than Spirulina sp. Interestingly, the value of IE has increased with the corrosion rate as a result of temperature rise. Adsorption thermodynamic parameters, including activation energy (Ea), enthalpy (H°), and entropy (S°), were also computed and found to be in good agreement with experimental data. Different mechanisms are at work, as evidenced by the fact that the Ea value varies between Chlorella sp. and Spirulina sp. Evidence of endothermic and spontaneous in the reaction was provided by the positive H° and S° values. The research concluded that both green microalgae were a promising option for corrosion prevention due to their high inhibitory efficiency.