Studi Pengaruh Penambahan Inhibitor Ekstrak Bahan Alami pada Cat sebagai Penghambat Laju Korosi untuk Pelat Kapal A36

Kurnianto, Ardi (2024) Studi Pengaruh Penambahan Inhibitor Ekstrak Bahan Alami pada Cat sebagai Penghambat Laju Korosi untuk Pelat Kapal A36. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Korosi merupakan fenomena degradasi kualitas material yang menjadi ancaman serius dalam dunia maritim, khususnya di industri perkapalan. Untuk meminimalisir korosi, digunakan inhibitor cat, dimana hingga saat ini inhibitor cat masih melibatkan bahan kimia yang berpotensi merugikan lingkungan dan kehidupan akuatik. Penelitian ini bertujuan untuk menguji potensi ekstrak bahan alami sebagai inhibitor korosi pada cat jenis alkyd terhadap baja ASTM A36 sebagai spesimen uji dengan variasi konsentrasi inhibitor cat sebesar 0%, 3%, 6%, dan 9% yang kemudian ditentukan konsentrasi optimal berdasarkan laju korosi yang paling minimum. Inhibitor yang digunakan berasal dari ekstrak biji buah durian yang diekstraksi menggunakan metode maserasi. Inhibitor dicampurkan ke dalam komponen cat dan diaplikasikan pada spesimen uji. Spesimen uji kemudian dilakukan pengujian korosi menggunakan metode sel tiga elektroda dengan elektroda pembanding SCE (saturated calomel electrode) dan elektroda bantu grafit. Fokus penelitian ini mencakup kandungan senyawa inhibitor, konsentrasi efektif inhibitor, dan pengaruh inhibitor cat terhadap laju korosi. Hasil uji kandungan inhibitor menunjukkan kadar flavonoid sebesar 6,83 mgQe/gr yang dihitung menggunakakan spektrofotometer UV-Vis. Hasil uji korosi didapatkan laju korosi paling rendah terjadi pada konsentrasi 6,969% inhibitor pada media korosif air laut (salinitas 35‰) dengan laju korosi sebesar 0,114 mmpy dan 0,085 mmpy pada konsentrasi 6,159% inhibitor dalam media korosif dengan salinitas 30‰. Analisis ekonomis dilakukan pada cat dengan konsentrasi 6,159% dan 6,969% inhibitor yang menunjukkan laju korosi paling minimum. Konsentrasi tersebut dianalisis lebih lanjut untuk memastikan keseimbangan optimal antara biaya dan efektivitas korosi. Biaya pembuatan campuran cat dengan konsentrasi 6,969% adalah Rp. 113.448 per liter, sedangkan biaya untuk cat dengan konsentrasi 6,159% adalah Rp. 106.454 per liter. Hasil aplikasi cat pada kapal berjenis bulk carrier 7700 DWT dengan Lpp 106,4 m, B 16,6 m, H 8,5 m, dan T 6,6 m didapatkan cat dengan konsentrasi 6,969% inhibitor membutuhkan biaya Rp. 141.384.181 dan cat dengan konsentrasi 6,159% inhibitor membutuhkan biaya Rp. 132.667.152 pada bagian lambung kapal yang dicat anti korosi dengan luasan total 2679,4 m2.
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Corrosion is a phenomenon of material degradation that poses a serious threat in the maritime world, particularly in the shipbuilding industry. To minimize corrosion, paint inhibitors are used, which to date still involve chemicals that potentially harm the environment and aquatic life. This study aims to test the potential of natural extract as a corrosion inhibitor in alkyd paint on ASTM A36 steel as test specimens with variations in paint inhibitor concentrations of 0%, 3%, 6%, and 9%, and to determine the optimal concentration based on the minimum corrosion rate. The inhibitors used were derived from durian seed extracts obtained through maceration. The inhibitors were mixed into the paint components and applied to the test specimens. Corrosion testing was conducted using a three-electrode cell with a saturated calomel electrode (SCE) as the reference electrode and a graphite auxiliary electrode. The research focuses on the inhibitor content, effective concentration, and the impact of the paint inhibitors on the corrosion rate. The inhibitor content analysis showed a flavonoid concentration of 6,83 mgQE/g, determined using a UV-Vis spectrophotometer. Corrosion tests revealed that the lowest corrosion rates occurred at 0,114 mmpy for a 6,969% inhibitor concentration in a corrosive marine environment (salinity 35‰) and 0,085 mmpy for a 6,159% inhibitor concentration in a corrosive medium with a salinity of 30‰. An economic analysis was conducted on paint with 6,159% and 6,969% inhibitor concentrations, which showed the minimum corrosion rate. These concentrations were further analyzed to ensure an optimal balance between cost and corrosion effectiveness. The cost of making the paint mixture with a 6,969% concentration is Rp. 113.448 per liter, while the cost for paint with a 6,159% concentration is Rp. 106.454 per liter. These concentrations were further analyzed to balance cost and corrosion effectiveness. The cost of producing paint with a 6,969% concentration was Rp. 113.448 per liter, while the cost for a 6,159% concentration was Rp. 106.454 per liter. Application of the paint on a 7700 DWT bulk carrier with dimensions Lpp 106,4 m, B 16,6 m, H 8,5 m, and T 6,6 m revealed that the paint with a 6,969% inhibitor concentration required Rp. 141.384.181, while the paint with a 6,159% inhibitor concentration required Rp. 132.667.152 for the anti-corrosion coating of a total hull area of 2679.4 m².

Item Type:	Thesis (Other)
Uncontrolled Keywords:	laju korosi, inhibitor cat, ekstrak biji durian, sel tiga elektroda, corrosion rate, coating inhibitor, durian seed extract, three-electrode cell
Subjects:	Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. V Naval Science > V Naval Science (General) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Ardi Kurnianto
Date Deposited:	09 Aug 2024 07:11
Last Modified:	09 Aug 2024 07:11
URI:	http://repository.its.ac.id/id/eprint/115224

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