Application of Myrmecodia Pendans Extract as a Green Corrosion Inhibitor for Mild Steel in 3.5% NaCl Solution

Abstract

The use of Myrmecodia Pendans (MP) extract as mild steel corrosion inhibitor in 3.5% NaCl media was investigated using weight loss and potentiodynamic polarization methods as well as characteristics analysis of the Fourier Transform Infra-Red (FTIR). Obtained data from weight loss and potentiodynamic polarization methods has shown the value of inhibition efficiency (% IE) is proportional toadded inhibitor concentration. Tafel constants data indicates that MP extract can act as cathodic and anodic inhibitors (type of mixed inhibitor). FTIR analysis also demonstrates the characteristics of MPextract. Occured inhibition mechanism was in the form of inhibitor adsorption process on metal surfacethat allegedly preceded by physical adsorption followed by chemical adsorption. Chemical adsorption is conceivable since metal surface scoping elevates as the increasing of inhibitor concentration.

The Modeling System of Isotherm Adsorption in Mechanism of Myrmecodia Pendans Extracts as the Corrosion Inhibitor in 3, 5% NaCl Solution

“…For the weight loss experiment, the specimen is formed as a coupon with dimension of 20 x 20 x 3 mm. Before the immersion, the specimen surface is smoothed by using the rubbing the paper so that the specimen surface is free from corrosion product which is flat and smooth [7]. …”

“…Then it is added with the extract of Sarang Semut (Myrmecodia pendans) at the concentration of 100, 200, 300, 400, and 500 mg/L [7].…”

“…This was because Sarang Semut contains functional groups of alcohol group, alkaloid group, as well as the element of N and O which had been tested by using the Gas Chromatography [6]. In 2014, Atria [7] conducted a research to narrow the range of concentration variation ranging from 0, 100, 200, 300, 400 and 500 ppm. The corrosion media and the inhibitor extract used were the same which were 3.5% NaCl and the extract of Sarang Semut.…”

“…Based on the consideration above, a deeper research will be conducted by the writer to find out the type of adsorption occurs in the research of Atria 2014 [7]. In this research, it will be analyzed the mechanism of adsorption by using the equations of Langmuir, Freundlich, and Temkin.…”

Sarang Semut (Myrmecodia Pendans) Extract as a Green Corrosion Inhibitor for Mild Steel in Acid Solution

“…Therefore, organic inhibitors are preferred as an alternative for corrosion inhibitors due to their wide availability, low cost of production, and environmental friendliness. Sarang semut is one of many local natural ingredients that appear to have excellent potential as an organic inhibitor adding an extract of this substance into a solution of NaCl at 3.5% showed inhibition efficiency of about 90% (Pradityana et al, 2014;Pradityana et al, 2016). Sarang semut, widely known as Myrmecodia pendans, is an epiphytic plant that grows naturally in Papua.…”