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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Rekayasa Mesin
Adityo Noor Setyo Hadi Darmo
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Computer Science & IT Engineering Mechanical Engineering

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PENGARUH PROSES PACK CARBURISING TERHADAP KEKERASAN BAJA KARBON RENDAH Adityo Noor Setyo Hadi Darmo; Sri Widodo
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2019): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 10 2019
Publisher : Prosiding SNST Fakultas Teknik

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Abstract

Penelitian ini bertujuan untuk mengetahui efektifitas penggunaan serbuk arang tempurung kelapa sebagai karburiser dan serbuk tulang sapi sebagai energizer dalam proses pack carburizing. Sebagai bahan baku utama  serbuk arang tempurung kelapa sebesar 80%, 75% dan 70% yang dicampur dengan 30%, 25%, 20% serbuk tepung tulang sapi sebagai katalis. Proses dilakukan dalam suatu kotak yang dipanaskan di atas temperatur austenit yaitu 9000C dengan lama holding time 30 menit di dalam electric furnace, dan setelah itu diquenching didalam air. Keefektifan karbon dievaluasi dari tingkat kekerasan permukaan dan pengamatan struktur mikro dengan menggunakan mesin Desktop Metals Analyser dan mikroskop optik digital pembesaran 200 x, sedang uji kekerasan permukaan dilakukan dengan menggunakan Micro Hardness Tester pada beban 25 gram selama 10 detik. Hasil pengujian menunjukkan, untuk campuran 1kg bahan pack carburizing dengan kandungan energizer masing-masing sebesar 30%, 25%, dan 20%, diperoleh hasil rata-rata kekerasan specimen mengalami kenaikan 6 (enam) kali lipat dari nilai kekerasan awal yang secara berurutan yaitu 893,05 VHN0,020, 813,62 VHN0,020, dan 788,57 VHN0,020. dari kekerasan mula-mula 150.68 HVN0,025, dengan struktur mikro hasil akhir berupa ferrit, perlit dan martensit.Kata kunci: energizer, carburizing, holding time, perlit.
Effect of Sandblasting Pressure on Corrosion Rate and Adhesion Strength in the Coating Process Rizal Catur Prasetyo; Nani Mulyaningsih; Adityo Noor Setyo Hadi Darmo
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Street lighting poles are an essential component of public street lighting (PSL) infrastructure and are commonly manufactured from low-carbon steel. However, this material is highly susceptible to corrosion if adequate surface protection is not provided. One of the most widely adopted protection methods is paint coating. Nevertheless, paint coatings remain vulnerable to mechanical damage, which may result in coating delamination and consequently reduce corrosion protection performance. Therefore, it is necessary to investigate process parameters that can improve coating adhesion while maintaining the corrosion resistance of the substrate. This study aims to evaluate the effect of sandblasting pressure on the corrosion rate and paint coating adhesion strength of low-carbon steel. Sandblasting was carried out at three pressure levels: 7, 8, and 9 bar. The corrosion behaviour was evaluated using the potentiodynamic polarisation method, while the coating adhesion strength was measured using a pull-off adhesion test. The results indicate that increasing the sandblasting pressure led to an increase in the corrosion rate. The specimen treated at 7 bar exhibited the lowest corrosion rate of 0.00428 mm/year, whereas the specimen treated at 8 bar showed the highest corrosion rate of 0.14998 mm/year. In contrast, higher sandblasting pressure improved the adhesion strength of the paint coating. The highest average adhesion strength of 2.73 MPa was obtained at 9 bar, while the lowest value of 2.28 MPa was recorded at 7 bar. These findings demonstrate that sandblasting pressure significantly influences the surface characteristics of low-carbon steel, thereby affecting both its corrosion behaviour and coating adhesion performance. The results provide useful insights for optimising surface preparation prior to painting and may contribute to improving the durability of protective coatings for street lighting applications.
Co-Authors Nani dkk. Mulyaningsih Rizal Catur Prasetyo Sri Widodo