Analisis Efektivitas Loratadine Kadaluarsa Sebagai Inhibitor Korosi Pada Baja ASTM A36 Dalam Media HCl 1 M

Vanzeva, Zahwa Nabiila Hirza (2026) Analisis Efektivitas Loratadine Kadaluarsa Sebagai Inhibitor Korosi Pada Baja ASTM A36 Dalam Media HCl 1 M. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 2038221082-Undergraduate_Theses.pdf - Accepted Version Restricted to Repository staff only Download (5MB) | Request a copy

Abstract

Korosi merupakan fenomena kerusakan material logam yang terjadi akibat interaksi elektrokimia antara logam dan lingkungan sekitarnya sehingga dapat menurunkan sifat mekanik dan ketahanan struktur material. Baja karbon ASTM A36 banyak digunakan dalam berbagai aplikasi industri karena memiliki sifat mekanik yang baik dan biaya yang relatif ekonomis, namun material ini rentan mengalami korosi terutama dalam lingkungan asam seperti larutan HCl. Penelitian ini bertujuan untuk mengevaluasi potensi loratadine kadaluarsa sebagai inhibitor korosi pada baja ASTM A36 dalam media larutan HCl 1 M. Pada penelitian ini memvariasikan konsentrasi loratadine kadaluarsa yaitu 100, 120, 140, 160, dan 180 ppm dengan melakukan perendaman selama 3, 6, 9, 12, dan 15 jam. Karakterisasi senyawa dilakukan menggunakan Fourier Transform Infrared Spectroscopy (FTIR), weight loss, Potentiodynamic Polarization (PDP), Electrochemical Impedance Spectroscopy (EIS), SEM, dan Atomic Force Microscopy (AFM). sedangkan mekanisme adsorpsi dianalisis menggunakan model isoterm adsorpsi. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi loratadine kadaluarsa mampu menurunkan laju korosi dan meningkatkan efisiensi inhibisi. Laju korosi tanpa inhibitor sebesar 8,7705 mmpy mengalami penurunan hingga mencapai 0,93062 mmpy pada konsentrasi 180 ppm. Efisiensi inhibisi berdasarkan pengujian PDP meningkat dari 35% pada konsentrasi 100 ppm menjadi 89% pada konsentrasi 180 ppm, sedangkan hasil EIS menunjukkan efisiensi inhibisi tertinggi sebesar 96,94% pada konsentrasi yang sama. Analisis polarisasi menunjukkan bahwa loratadine kadaluarsa bekerja sebagai mixed type inhibitor, yaitu mampu menghambat reaksi anodik dan katodik secara bersamaan. Selain itu, hasil analisis isoterm adsorpsi menunjukkan bahwa proses adsorpsi mengikuti model Temkin dengan nilai koefisien determinasi (R²) sebesar 0,9186, yang mengindikasikan adanya interaksi antarmolekul inhibitor pada permukaan logam. Berdasarkan hasil tersebut, konsentrasi 180 ppm merupakan konsentrasi optimum dan loratadine kadaluarsa berpotensi digunakan sebagai inhibitor korosi yang efektif untuk baja ASTM A36 dalam media HCl 1 M.
======================================================================================================================================
Corrosion is the degradation of metallic materials caused by electrochemical interactions between metals and their surrounding environment, which can reduce mechanical properties and structural durability. ASTM A36 carbon steel is widely used in various industrial applications due to its good mechanical properties and relatively low cost; however, this material is susceptible to corrosion, especially in acidic environments such as HCl solutions. This study aims to evaluate the potential of expired loratadine as a corrosion inhibitor for ASTM A36 steel in a 1 M HCl solution. In this study, expired loratadine concentrations were varied at 100, 120, 140, 160, and 180 ppm by soaking for 3, 6, 9, 12, and 15 hours. The compound was characterized using Fourier Transform Infrared Spectroscopy (FTIR), weight loss, Potentiodynamic Polarization (PDP), Electrochemical Impedance Spectroscopy (EIS), SEM, and Atomic Force Microscopy (AFM). while the adsorption mechanism was analyzed using adsorption isotherm models.The results showed that increasing the concentration of expired loratadine significantly reduced the corrosion rate and improved the inhibition efficiency. The corrosion rate of the uninhibited specimen was 8.7705 mmpy and decreased to 0.93062 mmpy at an inhibitor concentration of 180 ppm . The inhibition efficiency obtained from PDP measurements increased from 35% at 100 ppm to 89% at 180 ppm, while EIS analysis showed the highest inhibition efficiency of 96.94% at the same concentration. Potentiodynamic polarization analysis indicated that expired loratadine acted as a mixed-type inhibitor by simultaneously suppressing both anodic and cathodic reactions. Furthermore, adsorption isotherm analysis revealed that the adsorption process followed the Temkin isotherm model, with the highest coefficient of determination (R²) value of 0.9186, indicating the presence of interactions among inhibitor molecules on the metal surface. Therefore, an inhibitor concentration of 180 ppm was identified as the optimum concentration, and expired loratadine demonstrated strong potential as an effective corrosion inhibitor for ASTM A36 steel in a 1 M HCl solution.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ASTM A36, korosi, inhibitor korosi, loratadine kadaluarsa, HCl 1 M, adsorpsi Temkin, Corrosion, Corrosion Inhibitor, Expired Loratadine, ASTM A36 Steel, 1 M HCl, Temkin adsorption.
Subjects:	R Medicine > R Medicine (General) T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA462 Metal Corrosion and protection against corrosion
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Zahwa Nabilla Hirza Vanzeva
Date Deposited:	27 Jul 2026 03:13
Last Modified:	27 Jul 2026 03:13
URI:	http://repository.its.ac.id/id/eprint/137676

Actions (login required)

View Item