Kitosan Larut Air (WSC) sebagai Inhibitor Korosi Baja SS400 dalam Larutan HCl 2M

Rahmawati, Rahmawati (2026) Kitosan Larut Air (WSC) sebagai Inhibitor Korosi Baja SS400 dalam Larutan HCl 2M. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kitosan larut air (water-soluble chitosan, WSC) telah berhasil disintesis dari kitosan komersial yang dimanfaatkan sebagai inhibitor korosi pada baja SS400. WSC didapatkan dari proses depolimerisasi dengan H2O2 dalam pelarut asam asetat 2%. WSC hasil sintesis dikarakterisasi dengan spektrofotometer FTIR serta dilakukan uji kelarutan dalam pelarut air dan HCl 2M. Data yang diperoleh dari FTIR digunakan untuk penentuan nilai derajat deasetilasi dari WSC. Efektivitas kinerja WSC dalam menghambat laju korosi pada baja SS400 dalam media HCl 2M dipelajari dengan metode kehilangan berat (weight loss), polarisasi potensiodinamik, dan electrochemical impedance spectroscopy (EIS). Efisiensi inhibisi dilakukan pada variasi konsentrasi inhibitor WSC 100-600 mg/L. Hasil yang didapatkan menunjukkan efisiensi inhibisi meningkat terhadap kenaikan konsentrasi WSC dan mencapai efisiensi optimum pada konsentrasi 500 mg/L serta mengalami penurunan pada konsentrasi 600 mg/L. Efisiensi optimum WSC diperoleh sebesar 86,43% (metode kehilangan berat), 67,97% (metode polarisasi potensiodinamik), dan 73,07% (metode EIS). Hasil interpretasi pengukuran polarisasi potensiodinamik menunjukkan bahwa WSC adalah inhibitor tipe campuran (mix type). Isoterm adsorpsi WSC pada permukaan baja SS400 dalam media HCl 2M mengikuti isoterm adsorpsi Langmuir.
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Water-Soluble Chitosan (WSC) was successfully synthesized from commercial chitosan and utilized as a corrosion inhibitor for SS400 steel. WSC was obtained through a depolymerization process using H2O2 in a 2% acetic acid solvent. The synthesized WSC was characterized using FTIR spectrophotometry, and solubility tests were conducted in water and 2M HCl. The data obtained from FTIR were used to determine the degree of deacetylation of WSC. The effectiveness of WSC in inhibiting the corrosion rate of SS400 steel in 2M HCl medium was studied using the weight loss method, potentiodynamic polarization, and Electrochemical Impedance Spectroscopy (EIS). Inhibition efficiency was evaluated at various WSC inhibitor concentrations ranging from 100–600 mg/L. The results showed that inhibition efficiency increased with increasing WSC concentration, reaching an optimum efficiency at a concentration of 500 mg/L, and then decreasing at a concentration of 600 mg/L. The optimum inhibition efficiency of WSC was obtained at 86.43% (weight loss method), 67.97% (potentiodynamic polarization method), and 73.07% (EIS method). The interpretation results of the potentiodynamic polarization measurements indicated that WSC is a mixed-type inhibitor. The adsorption isotherm of WSC on the surface of SS400 steel in 2M HCl medium followed the Langmuir adsorption isotherm.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Baja SS400, EIS, inhibitor korosi, kitosan larut air, polarisasi potensiodinamik, weight loss, SS400 steel, EIS, corrosion inhibitor, water-soluble chitosan, potentiodynamic polarization
Subjects:	Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD115 Electrochemical analysis
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Rahmawati Rahmawati
Date Deposited:	30 Jul 2026 03:55
Last Modified:	30 Jul 2026 03:55
URI:	http://repository.its.ac.id/id/eprint/137911

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