PUDJIWATI, SRI (2025) ANALISIS LAJU KOROSI MATERIAL A105N DI MEDIA AIR REVERSE OSMOSIS DENGAN GREEN INHIBITOR HIBISCUS ROSA-SINENSIS. S2 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Valve is a crucial tool in the oil and gas industry that controls the flow of oil and gas fluid. The valve body, especially the closure valve part, must be heat-resistant, rust-resistant, and capable of withstanding high pressure. Based on the phenomenon in the field, precisely in the valve manufacturing industry company in the Banten area, that the problem of reducing the quality of the closure valve due to corrosion, this occurs when leak testing is carried out using a hydrotest, there is water trapped in the gap of the closure valve and there is a delay in delivery time to the customer. By examining the phenomena and research of previous researchers on corrosion, as well as field observations, further research is needed to overcome these problems, particularly in the use of environmentally friendly inhibitors to prevent potential corrosion in closure valve materials. The green inhibitor Hibiscus rosa-sinensis has the potential to be feasible in reducing and inhibiting corrosion in A105N valve material with Reverse Osmosis (RO) water media. The purpose of this study was to analyze the corrosion rate, surface morphology, and chemical composition, as well as the efficiency of inhibitors in valve material A105N. The test was carried out comprehensively using the Electrochemical testing method (Polarization of dynamic potential, Electrochemical impedance spectroscopy, Cyclic voltammetry, Chronoamperometry) and the surface morphology testing method (Optical microscope, SEM-EDX, cross-section). Based on the results of the electrochemical test, it was found that the use of Hibiscus rosa-sinensis inhibitor was effective in inhibiting the corrosion rate of valve material A105N in RO water media, with a decrease in corrosion rate of 70.26% and inhibitor efficiency of 72.24% at an inhibitor concentration of 10 grams in 24-hour immersion. The corrosion rate value is 0.82901x10-2 mmpy, the charge transfer resistance is 165,969.58 Ω cm², the peak oxidation and reduction current values are low. Then, in terms of surface morphology at a concentration of 10 grams of inhibitor, the surface of the material was more homogeneous, smoother, and brighter with an inhibitor thickness of 40 μm, and the atomic mass content of Fe was 31.57% and O was 43.12% greater when compared to samples without inhibitor. It can be concluded that the use of Hibiscus rosa-sinensis inhibitors on valve material A105N in RO water media is effective in inhibiting the rate of corrosion, and is recommended to valve manufacturing companies in the application of hydrotest leak testing as an environmentally friendly green inhibitor, biodegradable, nontoxic, easy to obtain, making it a promising alternative compared to synthetic inhibitors which are often dangerous. Key Words: Corrosion Rate, A105N Material, Green Inhibitor, Hibiscus Rosa Sinensis, dan Reverse Osmosis (RO) Valve merupakan salah satu peralatan krusial dalam industri migas yang berfungsi untuk mengatur aliran fluida minyak dan gas. Body valve terutama bagian closure valve haruslah tahan terhadap panas, karat, dan mampu menahan tekanan yang tinggi. Berdasarkan fenomena yang ada di lapangan tepatnya pada perusahaan industri pembuatan valve di daerah Banten bahwa permasalahan menurunnya kualitas closure valve akibat terjadinya korosi, hal ini terjadi pada saat dilakukan pengujian kebocoran dengan menggunakan hydrotest, terdapat air yang terperangkap pada celah closure valve dan terjadi keterlambatan waktu pengiriman ke customer. Dengan mengkaji fenomena dan penelitian para peneliti terdahulu tentang korosi serta pengamatan di lapangan maka diperlukan penelitian lebih lanjut untuk mengatasi permasalahan tersebut khususnya pada penggunaan inhibitor yang ramah lingkungan untuk mencegah potensi terjadinya korosi pada material closure valve. Inhibitor alami Hibiscus rosa-sinensis memiliki potensi yang layak dalam menurunkan dan menghambat terjadinya korosi pada material valve A105N dengan media air Reverse Osmosis (RO). Tujuan dari penelitian ini adalah menganalisis laju korosi, morfologi permukaan dan komposisi kimia, serta efisiensi inhibitor pada material valve A105N. Pengujian dilakukan secara komprehensif dengan menggunakan metode pengujian Elektrokimia (Polarisasi potensio dinamik, Electrochemical impedance spectroscopy, Cyclic voltametry, Chronoamperometry) dan metode pengujian morfologi permukaan (Mikroskop optik, SEM-EDX, Cross section). Berdasarkan hasil pengujian elektrokimia, diperoleh bahwa penggunaan inhibitor Hibiscus rosa-sinensis efektif dalam menghambat laju korosi material valve A105N pada media air RO, dengan penurunan laju korosi sebesar 70,26% dan efisiensi inhibitor sebesar 72,24% pada konsentrasi inhibitor 10 gram dalam perendaman 24 jam. Nilai laju korosi sebesar 0,82901x10-2 mmpy, resistensi tranfer muatan sebesar 165.969,58 Ω cm², nilai arus oksidasi dan reduksi puncak rendah. Kemudian dilihat dari morfologi permukaan pada konsentrasi inhibitor 10 gram, permukaan material lebih homogen, halus, dan lebih terang dengan ketebalan inhibitor 40 μm, serta kadar massa atom Fe sebesar 31,57% dan O sebesar 43,12% lebih besar jika dibandingkan dengan sampel tanpa inhibitor. Dapat disimpulkan bahwa penggunaan inhibitor Hibiscus rosa-sinensis pada material valve A105N dalam media air RO efektif dalam menghambat laju korosi, dan direkomendasikan kepada perusahaan manufaktur valve dalam penerapan uji kebocoran hydrotest sebagai green inhibitor yang ramah lingkungan, biodegradable, tidak beracun, mudah diperoleh, sehingga menjadi alternatif yang menjanjikan dibandingkan dengan inhibitor sintetik yang seringkali berbahaya. Kata Kunci: Laju Korosi, Material A105N, Green Inhibitor, Hibiscus Rosa Sinensis, dan Reverse Osmosis (RO)
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