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Effect Of Inhibitor Concentration Of Tea Leaf (Camelia sinensis) Extract On Corrosion Of 5L API Steel. The use of steel at this time has grown rapidly and is used in industrial technology as one of the supporting materials. There are several uses of steel used in the motorcycle, railway, car, marine, and other construction industries. But in the use of steel, many factors cause the power of this steel to decrease. One of the causes is the phenomenon of corrosion in steel. This research aims to determine the effect of tea leaf extract inhibitor concentrations on corrosion rates on API 5L steel and inhibit corrosion rates in API 5L steel. The method used is mass reduction. The corrosive medium used is NaCl and HCl. The length of immersion is 10 days to see the inhibitor's ability to inhibit corrosion rate. The method of making inihibitor extracts tea leaves using an ultrasonic bath. The concentration of inhibitors made in this study was 1%, 3%, 5%, 7%, and 9%. Before the steel is soaked in a corrosive solution, the corrosive solution is mixed first with the inhibitor solution according to its concentration. The results showed that the largest efficiency of corrosion inhibition occurred in the corrosive solution of NaCl with a concentration of 9% in immersion for 10 days which is 95% and in the corrosive solution of HCl with a concentration of 9% of 45%. Surface morphology obtained using api 5L electron microscope scanning shows the steel surface coated with tea leaf extract is corrosiond less. This suggests that tea leaf extract inhibitors are good at inhibiting the rate of corrosion that occurs in API 5L steel.

Pengaruh Konsentrasi Inhibitor Ekstrak Daun Teh (Camelia sinensis) Terhadap Laju Korosi Baja API 5L