Pengendalian Korosi Pada Baja Karbon A36 Dalam Larutan NaCl 3,5% Dengan Bio-Inhibitor Ekstrak Daun Mangkok (Polyscias Scutellaria)

Bahtiar, Moch. Bagus (2025) Pengendalian Korosi Pada Baja Karbon A36 Dalam Larutan NaCl 3,5% Dengan Bio-Inhibitor Ekstrak Daun Mangkok (Polyscias Scutellaria). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi merupakan permasalahan utama dalam industri, khususnya pada struktur baja karbon seperti ASTM A36 yang digunakan secara luas pada tangki penyimpanan. Penggunaan inhibitor korosi sintetis seringkali berdampak negatif terhadap lingkungan, sehingga mendorong pencarian alternatif yang ramah lingkungan. Penelitian ini bertujuan untuk mengevaluasi efektivitas ekstrak daun mangkok (Polyscias Scutellaria) sebagai bio-inhibitor korosi pada baja karbon A36 dalam larutan NaCl 3,5% pada berbagai konsentrasi (0, 100, 300, dan 500 ppm) dan variasi temperatur (30,40,50 dan 60°C). Pengujian dilakukan menggunakan metode elektro-kimia Tafel Polarisasi, EIS, serta karakterisasi FTIR, EDX, XRD, SEM dan AFM Hasil penelitian menunjukkan bahwa bio-inhibitor EPS (Ekstrak Polyscias Scutellaria) mampu menurunkan laju korosi secara signifikan pada konsentrasi optimal 300 ppm, dengan efisiensi inhibisi sebesar 84,61% pada suhu 30°C. Namun, efisiensi menurun pada konsentrasi 500 ppm karena terjadinya adsorpsi jenuh dan degradasi senyawa pada temperatur tinggi. Karakterisasi XRD, SEM-EDX dan AFM menunjukkan terbentuknya lapisan pelindung di permukaan baja terbaik pada konsentrasi 300 ppm. Penelitian ini mengindikasikan potensi besar EPS sebagai green corrosion inhibitor yang efektif dalam lingkungan klorida
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Corrosion is a major issue in the industry, particularly affecting carbon steel structures such as ASTM A36, which is widely used in storage tanks. The use of synthetic corrosion inhibitors often has negative environmental impacts, prompting the search for environmentally friendly alternatives. This study aims to evaluate the effectiveness of mangkok leaf extract (Polyscias scutellaria) as a bio corrosion inhibitor for A36 carbon steel in a 3.5% NaCl solution at various concentrations (0, 100, 300, and 500 ppm) and temperature variations (30,40,50 and 60°C).Testing was conducted using electrochemical methods including Tafel polarization, EIS, as well as FTIR, EDX, XRD, SEM snd AFM characterization. The results showed that the EPS (Polyscias scutellaria extract) bio-inhibitor significantly reduced the corrosion rate at an optimal concentration of 300 ppm, achieving an inhibition efficiency of 84.61% at 30°C. However, the efficiency decreased at a concentration of 500 ppm due to saturated adsorption and compound degradation at higher temperatures. Characterization of XRD, SEM EDX and AFM confirmed the formation of a protective layer on the steel surface, most effectively at 300 ppm. This study indicates the strong potential of EPS as an effective green corrosion inhibitor in chloride environments.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Electrochemichal, bio inhibitor, Polyscias Scutellaria, Baja karbon A36, Electrochemical, bio inhibitor, Polyscias Scutellaria, carbon steel A36
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials T Technology > TA Engineering (General). Civil engineering (General) > TA418.9.C57 Coatings T Technology > TN Mining engineering. Metallurgy > TN689+ Physical metallurgy T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 27101-(S2) Master Thesis
Depositing User:	Moch Bagus Bahtiar
Date Deposited:	01 Aug 2025 07:24
Last Modified:	01 Aug 2025 07:24
URI:	http://repository.its.ac.id/id/eprint/126084

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