Adham, Faris (2016) Pengaruh PH, Kecepatan Putaran, Dan Asam Asetat Terhadap Karakteristik CO2 Corrosion Baja ASME SA 516 Grade 70. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Fenomena korosi merupakan sesuatu yang pasti terjadi
pada setiap logam. Laju korosi dari suatu material dipengaruhi
oleh beberapa faktor diantaranya yaitu nilai pH lingkungan dan
karakteristik aliran fluida yang kontak langsung dengan logam.
Pada oil and gas industry, baja ASME SA 516 grade 70 sering
digunakan sebagai material flowline dan banyak terjadi CO2
Corrosion. Penelitian ini bertujuan untuk melakukan studi laju
korosi material baja ASME SA 516 grade 70 yang mengandung
CO2. Penelitian dilakukan dengan metoda weight loss
menggunakan alat Rotating Cylinder Electrode (RCE) selama 10
hari dan metode Polarization selama 1 jam. Selain itu digunakan
pula XRD dan SEM guna mendukung data-data analisa. Pada
penelitian ini digunakan media elektrolit NaCl 3,5% dengan
kandungan CH3COOH sebesar 0 ppm dan 1500 ppm dengan
variasi kecepatan putaran yaitu 0 RPM, 150 RPM, 300 RPM, dan
450 RPM pada pH 5 dan 6. Pada pengujian polarization,
didapatkan hasil laju korosi tertinggi sebesar 9.9323 mm/y pada
larutan CH3COOH 1500 ppm pH 5 dan kecepatan putar 450
RPM, sedangkan data dari pengujian weight loss sebesar 4.8795
mm/y. Hasil pengamatan SEM menunjukkan adanya perbedaan
morfologi pada permukaan spesimen karena pengaruh kecepatan
putaran. Kecepatan putaran mengakibatkan tergerusnya produk
korosi oleh aliran. Pada pengujian XRD dengan menggunakan
spesimen pH 5 dengan kandungan 0 ppm dan 1500 ppm 0 RPM ditemukan FeCO3, Fe(OH)3 dan senyawa FeOOH sebagai produk
korosi.
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The corrosion phenomenon is something bound to happen
on any metal. The corrosion rate of a material is affected by
several factors such as the values of the pH and fluid flow
characteristics. In oil and gas industry, ASME SA-516 grade 70
steel used as the material for the flowlines and lots of CO2
Corrosion occurs. This research aims characterized corrosion
rate of the ASME SA-516 grade 70 steel which contains CO2. This
research used weight loss method with the Rotating Cylinder
Electrode (RCE) for 10 days and Polarization method for 1 hour.
While XRD and SEM is used to support data analysis. In this
research used electrolyte 3,5% NaCl with CH3COOH contents of
0 ppm and 1500 ppm with the variation of the rotational speed i.e.
0 RPM, 150 RPM, 300 RPM, and 450 RPM, and at pH 5 and 6 in
10 mm diameter and 10 mm thick specimens specimens.
Polarization testing result show the higest corrosion rate was
9.9323 mm/y on 1500 ppm CH3COOH pH 5 solution with
rotational speed 450 RPM, and from weight loss 10 days the
result was 4,8795 mm/y. SEM observations showed a difference
on morphology of surface of the specimen due to the influence of
the speed rotation. Rotational speed caused abrasion of the
corrosion products by the flow. XRD testing using pH 5
electrolyte solution with 0 ppm and 1500 ppm CH3COOH, 0 RPM
found FeCO3, Fe(OH)3 and FeOOH as corrosion products.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 620.112 23 Adh p |
| Uncontrolled Keywords: | CO2 Corrosion, laju aliran, Acetic Acid, Rotating Cylinder Electrode, pH. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | ansi aflacha |
| Date Deposited: | 27 Mar 2020 07:19 |
| Last Modified: | 27 Mar 2020 07:19 |
| URI: | http://repository.its.ac.id/id/eprint/75578 |
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