Analisis Efisiensi Inhibitor Ekstrak Daun Jati (Tectona grandis) pada Material SUS 316L di Dalam Larutan NaCl 3,5%

Abstract

Stainless steel is commonly used in maritime pipe systems aboard ships due to its
resistance to corrosion. Seawater contains high concentrations of chloride ions (Cl - ), which are
powerful catalysts for corrosion. When stainless steel is exposed to seawater, its protective
passivation layer on the surface may be compromised, making the steel more prone to corrosion.
A good strategy for combating this corrosion is to use corrosion inhibitors. This study was to
compare the corrosion rates and the effectiveness of using inorganic inhibitors NaNO 2 with
varying inhibitor concentrations and organic teak leaf extract (Tectona grandis) as corrosion
inhibitors on 316L stainless steel material. The concentration variation of adding each inhibitor to
NaCl is 0 ppm, 1.000 ppm, 3.000 ppm, and 5.000 ppm. The method used in this research was
experimental research with immersion tests and calculation of corrosion rates using the weight
loss method. The results showed that the lowest corrosion rate was in the variation of adding
NaNO 2 inhibitor at 5.000 ppm with 0,011 mmpy and 52,174% inhibition efficiency. The study
concluded that adding a NaNO 2 inhibitor results in a lower corrosion rate and a higher inhibition
efficiency compared to the use of teak leaf extract inhibitor.