Pengaruh pH, Kecepatan Putar, dan Rasio Volume Inhibitor Berbasis Imidazoline dan Parasetamol Terhadap Perlindungan Korosi Baja ST 41 di Lingkungan yang Mengandung Gas CO2 dengan Menggunakan Metode Rotating Cylinder Electrode (RCE)

Steven, Jodie (2018) Pengaruh pH, Kecepatan Putar, dan Rasio Volume Inhibitor Berbasis Imidazoline dan Parasetamol Terhadap Perlindungan Korosi Baja ST 41 di Lingkungan yang Mengandung Gas CO2 dengan Menggunakan Metode Rotating Cylinder Electrode (RCE). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Eksperimen terhadap korosi CO2 dengan menggunakan Rotating Cylinder Electrode (RCE) telah dilaksanakan, pada penelitian ini digunakan baja karbon ST 41 berbentuk silinder sebagai spesimen uji dengan parameter pH 4 dan pH 6, dengan kecepatan putar 150 RPM dan 250 RPM, rasio volume inhibitor campuran berbasis imidazoline dan parasetamol yang digunakan adalah 1 (imidazoline) : 2 (parasetamol), 1 : 1, serta 2 : 1 pada larutan NaCl 3,5% dengan injeksi gas CO2. Dilakukan pengujian weight loss, perhitungan adsorpsi isoterm, polarisasi linear (tafel), Electrochemical Impedance Spectroscopy (EIS), FTIR, dan XRD. Dari hasil pengujian weight loss didapatkan nilai efisiensi inhibitor tertinggi adalah pada pH 6, 150 RPM, rasio volume inhibitor campuran 2 : 1 sebesar 61,412 %. Menurut perhitungan adsorpsi isoterm inhibitor campuran teradsorpsi dengan cara physisorption. Dari pengujian polarisasi linear (Tafel) kurva tafel bergeser ke kanan bawah yang menunjukkan penurunan nilai icorr dan reaksi yang terjadi menjadi lebih anodik, serta reaksi pada sampel uji lebih dominan sehingga inhibitor bersifat anodik yang berinteraksi melalui adsorpsi pada permukaan logam. Pengujian FTIR didapatkan gugus fungsi N-H, C=C yang identik dari inhibitor campuran menempel pada permukaan logam setelah proses running selama sepuluh hari. Hasil pengujian EIS menunjukkan dengan adanya penambahan inhibitor, terjadi peningkatan nilai tahanan polarisasi dan penurunan nilai CPE (constant phase element). Dari pengujian XRD ditunjukkan adanya senyawa produk korosi CO2 berupa FeCO3 dan Fe2O3 yang berasal dari kontaminasi oksigen di udara untuk rasio volume inhibitor 1 : 2, sedangkan sampel uji dengan rasio volume 2 : 1 terdapat senyawa iron nitride Fe24N10 yang terbentuk karena reaksi chemisorption antara Fe dan atom nitrogen dari pyridine yang terdapat pada inhibitor imidazoline. Mekanisme inhibisi dari inhibitor campuran imidazoline dan parasetamol adalah secara campuran, baik dari imidazoline adalah secara chemisorption dan parasetamol adalah physisorption. ============ CO2 corrosion experiment using rotating cylinder electrode (RCE) has been conducted, on this research, cylindrical shape ST 41 carbon steel was used as the sample. With the parameter of Ph 4 and Ph 6, 150 RPM and 250 RPM rotation speed, with mixed inhibitor volume ratio of 1 (imidazoline) : 2 (paracetamol), 1 : 1, also 2 : 1 at the Sodium Chloride solution (NaCl) 3.5 % injected with the CO2 gas. The Weight loss measurement, isoterm adsorption calculation, linear polarization (tafel), Electrochemical Impedance Spectroscopy (EIS), FTIR, and XRD measurement has also been done. From the weight loss measurement result, the highest inhibitor efficiency was 61.412 % at the 6 Ph, 150 RPM, with the mixed inhibitor volume ratio of 2 : 1, adsorption isoterm calculation indicate the adsorption mechanism of the mixed inhibitor is physical adsorption. Linear polarization result suggest the tafel curve move to down and right which mean in reduced icorr values, and anodic reaction of the system that yield in anodic type inhibitor reaction which interact with the metal surface with adsorption. the FTIR spectrum result found the functional group N-H from the inhibitor was attached on the metal surface after ten days of running process, on the EIS result on increase value of polarization resistance value and decrease on CPE (constant phase element) value. on the other hand, the X – ray diffraction (XRD) result from the volume ration of 1 : 2 confirm the CO2 corrosion product FeCO3 and Fe2O3 was formed from oxygen contamination of air, and from the volume ratio of 2 : 1 mixed inhibitor confirmed that iron nitride (Fe24N10) compound was formed because of the chemisorption reaction between Fe and nitrogen atom from pyridine at the imidazoline inhibitor. The mixed inhibitor mechanism of inhibition is mixed type, either from imidazoline based type is chemisorption type, and paracetamol based is physisorption

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Korosi CO2; pH; Kecepatan Putar; Rasio Volume; Inhibitor Imidazoline; Inhibitor Parasetamol; CO2 Corrosion; pH; Rotation Speed; Volume Ratio; Imidazo line inhibitor; Paracetamol inhibitor
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
T Technology > TP Chemical technology
T Technology > TP Chemical technology > TP255 Electrochemistry, Industrial.
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Steven Jodie
Date Deposited: 06 Feb 2018 02:35
Last Modified: 06 Feb 2018 02:35
URI: http://repository.its.ac.id/id/eprint/49260

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