Proceedings of the 11th International Applied Business and Engineering Conference, ABEC 2023, September 21st, 2023, Bengkalis, Riau, Indonesia

Research Article

Adsorption Effect of Theobroma Cacao Extract On Steel Surface to Protect Corrosion Rate

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  • @INPROCEEDINGS{10.4108/eai.21-9-2023.2342963,
        author={Yuli  Yetri and Apriska  Apriska and Wan Mohd Norsani and Sukatik  Sukatik and Rakiman  Rakiman and Maimuzar  Maimuzar},
        title={Adsorption Effect of Theobroma Cacao Extract On Steel Surface to Protect Corrosion Rate},
        proceedings={Proceedings of the 11th International Applied Business and Engineering Conference, ABEC 2023, September 21st, 2023, Bengkalis, Riau, Indonesia},
        publisher={EAI},
        proceedings_a={ABEC},
        year={2024},
        month={2},
        keywords={corrosion theobroma cacao weight loss adsorption},
        doi={10.4108/eai.21-9-2023.2342963}
    }
    
  • Yuli Yetri
    Apriska Apriska
    Wan Mohd Norsani
    Sukatik Sukatik
    Rakiman Rakiman
    Maimuzar Maimuzar
    Year: 2024
    Adsorption Effect of Theobroma Cacao Extract On Steel Surface to Protect Corrosion Rate
    ABEC
    EAI
    DOI: 10.4108/eai.21-9-2023.2342963
Yuli Yetri1,*, Apriska Apriska2, Wan Mohd Norsani3, Sukatik Sukatik1, Rakiman Rakiman1, Maimuzar Maimuzar1
  • 1: Politeknik Negeri Padang
  • 2: Universitas Andalas
  • 3: University Trengganu Malaysia
*Contact email: yuliyetri@pnp.ac.id

Abstract

Research has been carried out to slow down the corrosion rate of steel by using biomass waste inhibitors of cocoa pod extract (Theobroma cacao). Phase analysis that occurs with X-Ray Diffraction (XRD), and the Density Functional Theory (DFT) method to analyze the shape of the molecular structure, geometry, HOMO and LUMO contours. The weight loss method gives the best results with the lowest corrosion rate of 0.2972 mg.cm2/hour and an inhibition efficiency of 74.7128% for steel soaked in inhibitor for 168 hours and in HCl for 48 hours. Morphological analysis using optical microscopy and SEM showed that the longer it was immersed in the inhibitor, the flatter the surface and the fewer cracks it had. The XRD results also showed that there were four sharp peaks of the crystalline Fe and C phases due to the reaction between the steel surface and the inhibitor. AFM analysis shows that the adsorption formed on the surface is directly proportional to the length of immersion in the inhibitor. Analysis of the DFT method shows that the greater the EHOMO, the easier it is for a molecule to donate its electrons, so that the greater its ability to protect against corrosion. Optimization and calculation of tannin compounds that react with the steel surface resulted in a fairly high inhibition efficiency of the cocoa pod extract inhibitor, which was 80.2098%.