MILD STEEL CORROSION INHIBITION BY BLACK TEA EXTRACT IN DYNAMIC SODIUM CHLORIDE SOLUTION

Abstract

Camellia sinensis (tea) leaves were well-known natural product containing phenolic and flavonoid compounds, which reveals a significant advantage for corrosion inhibition purpose. In this study, the active compound in camellia sinensis (tea) leaves were extracted using several solvents and further characterize with FTIR to identify the functional group in it including their abundance. Corrosion experiment using JR235 mild steel grade with size 25mm x 25mm x 3mm was conducted where these specimens were immersed in the flowing system models in the control condition for 60 days. Corrosion performance was investigate using weight loss method where mild steels were studied and analyzed by using the mathematical equation to determine the weight difference, thus determining the corrosion rate of mild steel plate. In addition, SEM was used in order to monitor the surface morphology of mild steel. Results reveal that corrosive layer formation is being inhibited correspond to extract usage. This research found that the inhibition properties increase with the increasing concentration of extract in sodium chloride solution. Therefore, camellia sinensis (tea) leaves extract serves as an effective and non-toxic corrosion inhibitor for mild steel in dynamic saline condition.