Pemanfaatan Kitosan Larut Air Sebagai Inhibitor Korosi Baja SS400 Dalam Larutan HCl 1M

Anzani, Puspita Rika (2026) Pemanfaatan Kitosan Larut Air Sebagai Inhibitor Korosi Baja SS400 Dalam Larutan HCl 1M. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi merupakan salah satu penyebab penurunan kinerja dan umur pakai material logam, khususnya baja karbon rendah yang sering digunakan pada industri. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi kitosan larut air sebagai inhibitor korosi ramah lingkungan pada baja karbon rendah SS400 dalam media HCl 1M. Hasil peningkatan derajat deasetilasi dari kitosan komersial sebesar 80% menjadi 93% pada water-soluble chitosan (WSC) dengan nilai uji kelarutan sebesar 253 mg/L. Pengujian efisiensi inhibisi dilakukan dengan tiga metode yaitu pengurangan berat, polarisasi potensiodinamik dan electrochemical impedance spectroscopy (EIS) dengan variasi konsentrasi inhibitor sebesar 0; 25; 50; 75; 100; 125; 150; dan 175 mg/L. Hasil menunjukkan bahwa penambahan WSC mampu menurunkan laju korosi secara signifikan dibandingkan dengan spesimen tanpa inhibitor. Berdasarkan metode pengurangan berat menunjukkan penurunan laju korosi sebesar 4,7905 mmpy pada konsentrasi inhibitor WSC sebesar 100 mg/L yang sejalan dengan hasil pengujian elektrokimia. Pada metode polarisasi potensiodinamik, nilai densitas arus korosi (icorr) yang semakin menurun hingga 1,43 × 10-4 A/cm2 pada konsentrasi 100 mg/L. Hasil EIS menunjukkan peningkatan hambatan polarisasi (Rp) sebesar 81,93 Ω∙cm2 dengan konsentrasi yang sama. Nilai efisiensi tertinggi diperoleh pada konsentrasi 100 mg/L dengan nilai masing-masing sebesar 81,31% berdasarkan metode pengurangan berat, 76,45% berdasarkan polarisasi potensiodinamik, 74,62% berdasarkan EIS. Analisis isoterm adsorpsi menunjukkan bahwa proses adsorpsi WSC pada permukaan baja karbon rendah SS400 mengikuti model Langmuir dengan nilai koefisien determinasi (R2) sebesar 0,9964 dengan pembentukan lapisan monolayer yang relatif homogen. Molekul WSC menghambat korosi melalui mekanisme adsorpsi pada permukaan baja sehingga mengurangi perpindahan ion H+, Cl-, dan Fe2+ dalam reaksi korosi. Hasil penelitian ini menunjukkan bahwa kitosan larut air atau WSC berpotensi digunakan sebagai inhibitor korosi efektif dan ramah lingkungan dalam meningkatkan ketahanan korosi baja karbon rendah SS400.
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Corrosion is one of the primary causes of performance degradation and reduced service life of metallic materials, particularly low-carbon steel widely used in industrial applications. This study aimed to investigate the consentration effect of water-soluble chitosan (WSC) as an environmentally friendly corrosion inhibitor for SS400 low-carbon steel in a 1M HCl solution. The results of increasing the degree of deacetylation of commercial chitosan by 80% to 93% in WSC with a solubility test value of 253 mg/L. Inhibisi efficiency testing was carried out using three methods: weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS), with inhibitor concentrations of 0; 25; 50; 75; 100; 125; 150; and 175 mg/L. The result showed that the addition of WSC significantly reduced the corrosion rate compared with the uninhibited specimen. The weight loss method revealed a reduction in the corrosion rate to 4.7905 mm/year at the optimum WSC concentration of 100 mg/L, which was consistent with the electrochemical test result. Potentiodynamic polarization measurement indicated a decrease in corrosion current density (icorr) to 1.43 × 10-4 A/cm2 at the same concentration. Furthermore, EIS analysis demonstrated an increase in polarization resistance (Rp) to 81.93 Ω∙cm2. The highest inhibition efficiencies were obtained at 100 mg/L, reaching 81.31% based on the weight loss method, 76.45% based on potentiodynamic polarization, and 74.62% based on EIS measurements. Adsorpsi isoterm analysis demonstrated that the adsorption behavior of WSC on the steel surface followed the Langmuir isoterm model with a coefficient of determination (R2) of 0.9964. The corrosion inhibition mechanism of WSC is attributed to its adsorption onto the steel surface, forming a protective layer that restricts the transport of H+, Cl-, and Fe2+ ions involved in the corrosion process. These findings indicate that WSC has strong potential as an effective and environmentally friendly corrosion inhibitor for enhancing the corrosion resistance of SS400 low-carbon steel.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Baja Karbon Rendah SS400, Elektrokimia, Inhibitor Korosi, Korosi, Water-soluble chitosan, Corrosion, Corrosion inhibitor, Electrochemistry, SS400 Low-carbon Steel, Water-soluble chitosan
Subjects:	Q Science Q Science > QD Chemistry Q Science > QD Chemistry > QD115 Electrochemical analysis
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Puspita Rika Anzani
Date Deposited:	30 Jul 2026 06:41
Last Modified:	30 Jul 2026 06:41
URI:	http://repository.its.ac.id/id/eprint/139798

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