Analisis pengaruh penambahan unsur nikel (Ni) terhadap sifat mekanik, struktur mikro dan ketahanan korosi paduan tembaga nikel (Cu-Ni) sebagai material alternatif untuk pengecoran ball valve

Hidayat, Wahyu (2018) Analisis pengaruh penambahan unsur nikel (Ni) terhadap sifat mekanik, struktur mikro dan ketahanan korosi paduan tembaga nikel (Cu-Ni) sebagai material alternatif untuk pengecoran ball valve. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ball valve merupakan sebuah alat yang mengatur suatu aliran fluida. Ball valve banyak diaplikasikan di industri petroleum dan industri lainnya. Penelitian ini bertujuan menganalisis pengaruh penambahan unsur Ni pada paduan Cu-Ni terhadap struktur mikro, ketahanan korosi dan sifat mekanik. Variasi pada paduan yang digunakan adalah penambahan Ni sebesar 10%, 20%, 30% dan 40%wt. Pengujian komposisi kimia dilakukan dengan alat XRF. Transformasi fasa dianalisa menggunakan XRD dan diamati di bawah mikroskop optik. Uji korosi mengunakan metode polarisasi tafel. Pada pengujian tarik, didapatkan nilai ultimate tensile strength (UTS) dan yield strength (YS). Pengujian kekerasan menggunkan metode vickers. Logam paduan Cu-Ni membentuk fasa tunggal α Cu yang teramati pada hasil pengujian XRD. Fasa tunggal α Cu terdiri dari bagian gelap dan terang pada pengamatan di bawah struktur mikro. Nilai kekerasan tertinggi terdapat pada paduan Cu-40Ni sebesar 74,13 VHN. Nilai ultimate tensile strength tertinggi terdapat pada Cu-30Ni sebesar 116,7 MPa. Nilai yield strength tertinggi terdapat pada paduan Cu-30Ni sebesar 112,4 MPa. Nilai corrosion rate tertinggi terdapat pada Cu-40Ni sebesar 0,59 mpy. Dari semua paduan, paduan Cu-30Ni lebih baik dibandingkan paduan Cu-Ni yang lainnya untuk aplikasi material ball valve. ============ Ball valve is a tool which manage or control the flow of a fluid. Ball valve is much applied in the petroleum industry and other industries. This research aims to analyse the impact of increasing Ni elements in Cu-Ni alloys toward micro structure, corrosion resilience and mechanical properties. The variation of alloys which used is the addition of Ni in the amount of 10%, 20%, 30%, and 40% wt. The testing of the chemical composition is done by using tool XRF. Phase transformation is analysed by using XRD and later observed by optical microscope. Corrosion testing is done by using tafel polarization. For tensile strength testing, the ultimate tensile strength (UTS) value and yield strength (YS) value will be retrieved. Hardness testing by using Vickers method. Cu-Ni alloys will construct single phase α Cu which observed in the result of XRD testing. Single phase α Cu is made from dark side and bright side under the observation in micro structure. The highest hardness is Cu-40Ni alloys which is 74,13 VHN. The highest ultimate tensile strength is Cu-30Ni alloys which is 116,7 MPa The highest yield strength is Cu-30Ni alloys which is 112,4 MPa. The highest corrosion rate is Cu-40Ni alloys which is 0,59 mpy. For all alloys, Cu-30Ni alloys are better than other Cu-Ni alloys for material applications of ball valve.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Paduan Cu-Ni; Sifat Mekanik; Struktur Mikro; Korosi; Cu -Ni alloys; Mechanical Properties; micro structure; corrosion
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
T Technology > TS Manufactures > TS253 Die-Casting
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Wahyu Hidayat
Date Deposited: 06 Feb 2018 05:49
Last Modified: 06 Feb 2018 05:49
URI: http://repository.its.ac.id/id/eprint/49301

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