Potensi Kitosan Larut Air Sebagai Inhibitor Korosi Ramah Lingkungan Pada Baja Karbon Dalam Media NaCl1%

Penggalih, Reno (2026) Potensi Kitosan Larut Air Sebagai Inhibitor Korosi Ramah Lingkungan Pada Baja Karbon Dalam Media NaCl1%. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi pada baja karbon merupakan salah satu permasalahan yang banyak dijumpai di berbagai sektor industri karena dapat menurunkan kualitas material dan memperpendek umur pakainya. Penggunaan inhibitor korosi berbasis biomaterial menjadi salah satu alternatif yang banyak dikembangkan karena lebih aman dan berkelanjutan dibandingkan inhibitor anorganik. Penelitian ini bertujuan untuk mensintesis water-soluble chitosan (WSC) dari kitosan komersial serta mengevaluasi kinerjanya sebagai inhibitor korosi pada baja karbon SS400 dalam media NaCl 1%. WSC disintesis melalui proses depolimerisasi menggunakan hidrogen peroksida (H₂O₂) dan dikarakterisasi menggunakan Fourier Transform Infrared (FTIR). Efektivitas WSC dievaluasi menggunakan metode weight loss, polarisasi potensiodinamik (Potentiodynamic Polarization), dan Electrochemical Impedance Spectroscopy (EIS) pada variasi konsentrasi 25, 50, 75, 100, dan 125 ppm. Hasil karakterisasi FTIR menunjukkan bahwa proses sintesis berhasil menghasilkan WSC tanpa menghilangkan gugus fungsi utama, yaitu gugus hidroksil (–OH) dan amina (–NH₂), serta meningkatkan derajat deasetilasi dari 80,23 menjadi 93,70%. Selain itu, WSC menunjukkan peningkatan kemampuan larut dalam air sebagai indikator keberhasilan proses depolimerisasi. Hasil pengujian korosi menunjukkan bahwa penambahan WSC mampu menurunkan laju korosi, kehilangan massa, dan rapat arus korosi (Icorr), serta didukung oleh peningkatan nilai tahanan perpindahan muatan (Rct). Konsentrasi optimum diperoleh pada 100 ppm dengan efisiensi inhibisi sebesar 62,02% berdasarkan metode weight loss dan 65,44% berdasarkan polarisasi potensiodinamik. Analisis isoterm adsorpsi menunjukkan bahwa adsorpsi WSC mengikuti model Freundlich dengan nilai koefisien determinasi (R²) sebesar 0,92543. Hasil penelitian menunjukkan bahwa WSC berpotensi digunakan sebagai inhibitor korosi ramah lingkungan pada baja karbon SS400 dalam media NaCl 1% melalui mekanisme adsorpsi yang membentuk lapisan pelindung pada permukaan baja sehingga menghambat proses korosi.
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Corrosion of carbon steel is one of the major challenges encountered in various industrial sectors because it degrades material quality and shortens service life. The use of bio-based corrosion inhibitors has attracted considerable attention as a safer and more sustainable alternative to conventional inorganic inhibitors. This study aimed to synthesize water-soluble chitosan (WSC) from commercial chitosan and evaluate its performance as a corrosion inhibitor for SS400 carbon steel in a 1% NaCl solution. WSC was synthesized through depolymerization using hydrogen peroxide (H₂O₂) and characterized by Fourier Transform Infrared (FTIR) spectroscopy. The corrosion inhibition performance of WSC was evaluated using the weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods at concentrations of 25, 50, 75, 100, and 125 ppm. The FTIR characterization confirmed that the synthesis successfully produced WSC without altering its primary functional groups, namely hydroxyl (–OH) and amino (–NH₂) groups, while increasing the degree of deacetylation from 80.23 to 93.70%. In addition, the synthesized WSC exhibited improved water solubility, indicating the successful depolymerization of chitosan. The corrosion test results demonstrated that the addition of WSC reduced the corrosion rate, mass loss, and corrosion current density (Icorr), and was supported by an increase in the charge transfer resistance (Rct). The optimum inhibitor concentration was 100 ppm, providing inhibition efficiencies of 62.02% and 65.44% based on the weight loss and potentiodynamic polarization methods, respectively. Adsorption isotherm analysis revealed that the adsorption behavior of WSC followed the Freundlich isotherm model with a coefficient of determination (R²) of 0.92543. These findings indicate that WSC has the potential to serve as an environmentally friendly corrosion inhibitor for SS400 carbon steel in a 1% NaCl solution through an adsorption mechanism that forms a protective layer on the steel surface, thereby inhibiting the corrosion process.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Baja karbon, Baja SS400, Inhibitor korosi, Korosi, Water Soluble Chitosan, Carbon steel, SS400 steel, Corrosion inhibitor, Corrosion, Water Soluble Chitosan.
Subjects:	Q Science Q Science > QD Chemistry Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Reno Penggalih
Date Deposited:	04 Aug 2026 08:51
Last Modified:	04 Aug 2026 08:51
URI:	http://repository.its.ac.id/id/eprint/143425

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