DEVELOPMENT OF WHITE TEA EXTRACT AS GREEN CORROSION INHIBITOR IN MILD STEEL UNDER 1 M HYDROCHLORIC ACID SOLUTION

Agus Paul Setiawan Kaban, Aga Ridhova, Gadang Priyotomo, Berna Elya, Ahmad Maksum, Yunita Sadeli, Sutopo, Taufik Aditiyawarman, Rini Riastuti, Johny Wahyuadi Soedarsono

Research output: Contribution to journalArticlepeer-review

Abstract

This work covers the effectiveness of the White tea extract as a green corrosion inhibitor and is correlated to the strength and stability bonding between the phenolic molecule and the Fe atoms in mild steel and how this interaction can be studied by altering the concentration and temperature. White tea has received considerable attention due to its capability as a corrosion inhibitor and has been extensively studied using electrochemical techniques. However, accurate and systematic functional group identification and surface modification have been missing. Our study sought to demonstrate the quantitative measurement of electrochemical impedance spectroscopy (EIS) complemented by the FTIR (Fourier transform infrared spectroscopy), Total Phenolic Test, and Raman Spectroscopy. The SEM (Scanning Electronic Microscope)/EDX (Energy-Dispersive X-Ray Spectroscopy), and AFM (Atomic Force Microscope) were used to study the surface modification. The EIS results show that the optimum inhibition efficiency was 96% in a solution of 80 ppm at 60 °C. Acetone 70% was used to extract White tea and gives 14.17±0.25% phenolic compound. Spectroscopic studies show -OH, Aromatic C=C, C=O and C-O-C become major contributors in the adsorption process and are found on the surface of metals as corrosion protection. Meanwhile, the thermodynamic calculation shows the White tea was adsorbed chemically. The nearness of R2 to 1 shows the adsorption agrees with the Langmuir adsorption isotherm. Eventually, the surface modification revealed that phenol molecules are responsible to reduce the corrosion rate at 16.38×10−3 mpy. Our results are expected to provide a guideline for future research in White tea as a green corrosion inhibitor

Original languageEnglish
Pages (from-to)6-20
Number of pages15
JournalEastern-European Journal of Enterprise Technologies
Volume2
Issue number6-110
DOIs
Publication statusPublished - 2021

Keywords

  • adsorption
  • catechin
  • chemisorption
  • green corrosion inhibitor
  • Langmuir isotherm
  • surface modification

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