Studi Korosi Batas Butir Inconel 625 Weld Overlay Clading Pada Pipa API 5L X52 Dengan Media Larutan Ferrit (III) Sulfat 75% + Asam Sulfat 98%

Wiyoko, Johan (2014) Studi Korosi Batas Butir Inconel 625 Weld Overlay Clading Pada Pipa API 5L X52 Dengan Media Larutan Ferrit (III) Sulfat 75% + Asam Sulfat 98%. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Inconel (Nickel Base Super Alloy) 625 memiliki ketangguhan dan ketahanan mulur yang tinggi, tahan terhadap degradasi kimia pada temperatur mendekati temperatur leburnya.. Korosi batas butir dapat terjadi pada inconel 625 karena kandungan kromium yang tinggi. Presipitasi karbida kromium (Cr23C6) dapat dengan mudah terbentuk jika kandungan kromium dan karbon tinggi. Karakterisasi material yang dilakukan adalah SEM (Scaning Electron Microscopy), XRD (X-Ray Diffraction) dan mikroskop optik. Perlakuan yang diberikan adalah mensensitisasi pada temperatur 500, 600, 700, 800, dan 900 ˚C selama 1 jam dan disentisasi pada temperatur 700 ˚C selama 9 dan 18 jam pendinginan furnace. Setelah spesimen berada pada temperatur kamar, spesimen dicelupkan pada Fe2(SO4)3 + H2SO4 selama 120 jam (5 hari). Dari hasil penelitian menunjukkan bahwa semua spesimen setelah disensitisasi memiliki senyawa Cr23C6 berdasarkan hasil XRD dan berdasarkan foto struktur mikro, serangan korosi batas butir meningkat seiring peningkatan temperatur pada range 500 ˚C sampai 700 ˚C dan menurun pada range 800 ˚C sampai 900 ˚C. Sedangkan waktu sensitisasi menyebabkan serangan korosi batas butir meningkat pada range waktu sensitisasi 1 jam sampai 9 jam dan menurun setelah disensitisasi selama 18 jam. ==================================================================================== Inconel (Nickel Base Super Alloy) 625 has toughness and high creep resistance, resistance to chemical degradation at temperatures approaching the melting temperature. Intergranular corrosion of Inconel 625 can occur due to the high chromium conten meet carbon and make chromium carbide precipitation (Cr23C6), the inisiator of intergranular corrosion. Intergranular corrosion will be more easily occur in inconel 625 weld overlay. Material characterization is performed by SEM (Scanning Electron Microscopy), XRD (X-Ray Diffraction) and optical microscopy. The treatments were sensitize at temperatures 500, 600, 700, 800, and 900 ° C for 1 h and at temperature 700 ° C for 9 and 18 hours of cooling furnace. After the specimen is at room temperature, the specimen is immersed in Fe2(SO4)3 75% + H2SO4 98% for 120 hours (5 days). The results showed that all the specimens after sensitized having Cr23C6 compounds based on the results of XRD and based on photo microstructure, intergranular corrosion attack increases with increasing temperature in the range 500 ° C to 700 ° C and decreases in the range of 800 ° C to 900 ° C. While the time of sensitization causes intergranular corrosion attack increases in sensitization time range 1 hour to 9 hours and decreases after sensitized for 18 hours.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 620.112 23 Wiy s
Uncontrolled Keywords: inconel 625, korosi batas butir, kromium karbida, temperatur sensitisasi, waktu sensitisasi, chromium carbide, inconel 625, intergranular corrosion, sensitization time, temperature sensitization
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Mrs Anis Wulandari
Date Deposited: 10 Jul 2017 01:56
Last Modified: 10 Jul 2017 01:56
URI: http://repository.its.ac.id/id/eprint/41935

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