Inhibitor Korosi Ramah Lingkungan Berbasis Kitosan Larut Air Untuk Pengendalian Korosi Pada Baja Karbon Rendah Dalam Media NaCl 2%

Roicha, Alfi Nur (2026) Inhibitor Korosi Ramah Lingkungan Berbasis Kitosan Larut Air Untuk Pengendalian Korosi Pada Baja Karbon Rendah Dalam Media NaCl 2%. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini menyajikan sintesis kitosan larut air atau water-soluble chitosan (WSC) sebagai inhibitor korosi ramah lingkungan untuk baja karbon SS400 dalam media korosi NaCl 2%. WSC hasil sintesis dikarakterisasi dengan FTIR, uji kelarutan, dan penentuan derajat deasetilasi (DD). Nilai DD WSC mencapai 93% lebih tinggi dibandingkan kitosan, yaitu 80%, serta kelarutan WSC dalam air mecapai sekurang-kurangnya 250 mg/L. Kinerja inhibisi WSC dievaluasi melalui metode weightloss (WL), polarisasi potensiodinamik (PDP), dan electrochemical impedance spectroscopy (EIS). Efisiensi inhibisi optimum diperoleh pada konsentrasi 75 mg/L pada metode WL 72,03%; PDP 78,03%; dan EIS 19,87%. Hasil polarisasi menunjukkan bahwa WSC bertindak sebagai inhibitor tipe campuran. Sementara itu, hasil EIS menunjukkan respon impedansi yang tidak sepenuhnya ideal karena nilai Rs hasil fitting bernilai negatif, sehingga data EIS digunakan sebagai pendukung kualitatif. Bentuk plot Nyquist mengindikasikan adanya pengaruh difusi ion atau oksigen pada proses korosi. Kajian isoterm adsorpsi menunjukkan bahwa adsorpsi WSC mengikuti model Langmuir, sehingga mekanisme inhibisi diduga terjadi melalui pembentukan lapisan adsorbat pada permukaan baja. Dengan demikian, WSC berpotensi sebagai inhibitor korosi ramah lingkungan untuk baja karbon SS400 dalam media NaCl 2%.
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This study presents the synthesis of water-soluble chitosan (WSC) as an environmentally friendly corrosion inhibitor for SS400 carbon steel in 2% NaCl medium. The synthesized WSC was characterized using FTIR, solubility testing, and degree of deacetylation (DD) determination. The DD value of WSC reached 93%, which was higher than that of chitosan at 80%, while its solubility in water reached at least 250 mg/L. The inhibition performance of WSC was evaluated using the weight loss method (WL), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS). The optimum inhibition efficiency was obtained at a concentration of 75 mg/L, with values of 72.03% from the WL method, 78.03% from PDP, and 19.87% from EIS. The polarization results indicated that WSC acted as a mixed-type inhibitor. Meanwhile, the EIS results showed a non-ideal impedance response due to the negative (Rs) value obtained from the fitting process. Therefore, the EIS data were used as qualitative supporting evidence. The Nyquist plot suggested the contribution of ion or oxygen diffusion to the corrosion process. Adsorption isotherm analysis showed that WSC adsorption followed the Langmuir model, indicating that the inhibition mechanism likely occurred through the formation of an adsorbed layer on the steel surface. Thus, WSC has potential as an environmentally friendly corrosion inhibitor for SS400 carbon steel in 2% NaCl medium.

Keywords: Water Solublle Chitosan, Corrosion Inhibitor, SS400 Carbon Steel, 2% NaCl

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Kitosan Larut Air, Inhibitor Korosi, Baja Karbon SS400, NaCl 2%, Water Solublle Chitosan, Corrosion Inhibitor, SS400 Carbon Steel, 2% NaCl.
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:	Alfi Nur Roicha
Date Deposited:	30 Jul 2026 07:01
Last Modified:	30 Jul 2026 07:01
URI:	http://repository.its.ac.id/id/eprint/139826

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