PSI - Issue 72

Khedim Fatima Zahra et al. / Procedia Structural Integrity 72 (2025) 479–490

487

0.5,1, 3,4 and 5N (0.25, 0.5, 1.5, 2 and 2.5 M) H2SO4

Leaves, Latex, Fruit

0.12, 0.24, 0.36, 0.48 and 0.6 %

82.08 % for leaves at 0.5 N and 0.6 %

Physical adsorption

WL, thermometric method

Ibrahim et al. (2016)

Mixed

Aluminum

WL:Weight loss method. DFT: Density functional theory study. MD, MC: Molecular dynamics, Monte Carlo simulations. EIS:Electrochemical impedance spectroscopy. PP:Potentio-dynamic polarization test.

LPR: Linear polarization resistance. EFM:Electrochemical frequency modulation method. FTIR:Fourier transform infrared spectroscopy. SEM:Surface Morphology. AFM:Atomic Force Microscopy Analysis.

Fouda et al. (2016), the Calotropis procera leaves extract (CP) was investigated as a corrosion inhibitor for mild steel in a CO2-saturated 3.5 wt% NaCl solution. The results show that the CP is an effective inhibitor with inhibition efficiency of 93 % for 200 ppm at 50 and 70 °C using electrochemical impedance spectroscopy. This indicates that the adsorption of CP on mild steel is of the physisorption type. Polarization studies show that the CP acts as a mixed inhibitor. Also, a SEM analysis was showing some changes on the surface which could indicate CPLE molecules which make up the protective film are present, as CP molecules would act as a barrier to prevent contact between the aggressive environment and the bare mild steel surface and are responsible for the decrease in the Corrosion rate. Sudesh Kumar et al. [90] the corrosion inhibition of aluminum in different concentrations of sulfuric acid solution (H2SO4) in the different plant parts of Calotropis procera (CP) leaves, latex, and fruit. Was studied using weight loss method and thermometric method. For 0.12- 0.6 % concentration. The higher percentage estimated 82.08 % for leaves at 0.5 N and 0.6 % of CP leaves extract by weight loss method. Scanning electron microscopy reveals that plant extract adsorbed on metal surface and increased the smoothness of aluminum that decreases the metal surface for corrosion attack. 5. Conclusion Serious harm has been done to pipes transportation of oil and gas by corrosion. Metals and their alloys would eventually corrode, but with the right precautions could be managed. One practical method for protecting metals against corrosion was to use corrosion inhibitors. Conventional inorganic inhibitors are costly and toxic. for that the Scientists are looking for effective, safe, and nontoxic green corrosion inhibitors as a result of financial difficulties. From this overview, the industrial inhibitors can be replaced by natural product, available, non-toxic and not environmentally harmful and economical, using different parts of plants. Green corrosion inhibitors are produced by natural amino acids and plant extracts and tested in their inhibition efficiencies. It was for green inhibitors on equally performing and supported additional adsorption mechanisms captured rightly by the methods of adsorption (Temkin...etc.). A special attention, focus on the plant of Calotropis procera (kranka), has shown satisfactory results to reduce corrosion in minerals and especially Mild Steel. in different acid medium as HCl, H2 SO4, HNO3 and CO2 saturated 3.5 wt% NaCl for concentration between 5 ppm to 1000 ppm at room temperature. The disadvantage of electrochemical tests is to carry out standardized tests in temperatures between 35°C – 55°C. Our proposal in future work is to go beyond these temperatures up to 200°C and we look at the influence of temperature on the degradation of the biological components of the plant. The tendence get these results through by chemical tests (EIS, FTIR...etc.). Another proposal research aspired to confirm these results using mechanical experiments on mild steel using a kranka plant. References https://www.iea.org/news/growth-in-global-oil-demand-is-set-to-slow-significantly-by-2028 https://www.iea.org/reports/renewable-energy-market-update-june-2023/executive-summary https://www.activesustainability.com/sustainable-development/what-is-green-hydrogen-used for/?_adin=02021864894 Campari, A., Ustolin, F., Alvaro, A., et al., 2023. Review on hydrogen embrittlement and risk-based inspection of hydrogen technologies. International Journal of Hydrogen Energy, https://doi.org/10.1016/j.ijhydene.2023.05.293