Abstract
In this work, the effectiveness Inhibitor of Red dragon fruit (Hylocereus polyrhizus) skin extract (IRSE) as Green corrosion inhibitor for API 5L-B Steel in the corrosive environment of NaCl and HCl solutions is presented systematically. The inhibited corrosion rate was investigated using the Tafel polarization method, while the resistance value of the interface layer was examined using Electrochemical Impedance Spectroscopy (EIS) in various concentrations of inhibitors in the corrosion media of NaCl and HCl solutions. The results showed that IRSE was quite effective in corrosion medium with a solution of 3.5% NaCl and HCl with pH-3. IRSE works optimally and was able to inhibit the corrosion rate up to 56.54% and the resistance value of 3.84 x 108 ohms on the NaCl solution corrosion medium and 89.1% with a transfer resistance value of 4.18 x 103 ohms on the HCl corrosion medium. In the weight loss test, corrosion products were obtained and the crystallization stage used X-ray diffraction (XRD) testing. The results obtained showed that IRSE inhibited the corrosion process with by a physical adsorption mechanism.
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