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All Journal Jurnal Sains dan Seni ITS Jurnal Mechanical Journal of Natural Sciences and Mathematics Research Jurnal Rekayasa Mesin Manutech : Jurnal Teknologi Manufaktur JURNAL CRANKSHAFT Jurnal Teknik Mesin Indonesia Piston: Journal of Technical Engineering International Journal of Applied Technology Research Aptekmas : Jurnal Pengabdian Kepada Masyarakat Industrial Research Workshop and National Seminar Abdimas Terapan: Jurnal Pengabdian Kepada Masyarakat Terapan
Devi Eka Septiyani Arifin
Jurusan Teknik Mesin, Politeknik Negeri Bandung
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Effect of dehydrogenation holding time after black oxide coating on AISI 4340 steel on mechanical properties: Pengaruh waktu penahanan dehidrogenasi setelah pelapisan black oxide pada baja AISI 4340 terhadap sifat mekanik Adinda Fadhila; Devi Eka Septiyani Arifin
JURNAL MECHANICAL Vol 17 No 1 (2026): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

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Abstract

In the automotive industry, especially in labor-intensive industries such as PT XYZ which produces all components independently, the black oxide coating process is often applied to improve corrosion resistance, especially on AISI 4340 steel. However, this process has the potential to cause hydrogen embrittlement phenomena due to immersion in chemical solutions. One method to overcome this problem is the dehydrogenation (baking) process, which is thermal heating to remove hydrogen and restore the mechanical properties of the material. This study aims to analyze the effect of black oxide coating without dehydrogenation process and variation of dehydrogenation holding time on mechanical properties of AISI 4340 steel, including tensile strength, hardness, and oxalic acid drop test. The dehydrogenation process variation consists of specimens without dehydrogenation, as well as specimens with dehydrogenation process for 3 hours and 4 hours at 190±14°C. The test results show that the increase in dehydrogenation holding time is directly proportional to the increase in tensile strength and hardness of the material. The percentage increase in tensile strength between the 3-hour and 4-hour specimens reached 2.64%, while the increase in hardness was 3.96%. Specimens without dehydrogenation process showed lower tensile strength and hardness values.
Pengaruh waktu pelapisan back oxide terhadap ketahanan korosi dan sifat mekanik pada baja AISI 4340 Devi Eka Septiyani Arifin; Alda Diva Meidina
Jurnal Teknik Mesin Indonesia Vol 21 No 1 (2026): April
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/jtmi2112026129

Abstract

Blackening, also known as Black Oxide coating, is a conversion coating method that forms a black oxide layer on the surface of steel used in industry to enhance corrosion resistance, aesthetics, and mechanical properties. This study aims to determine the effect of coating times (blackening) of 10 minutes, 30 minutes, and 60 minutes at a temperature of 140 °C on the corrosion resistance, tensile strength, and coating thickness of AISI 4340 steel. The results showed that the variations succeeded in forming a uniform black layer that adhered well to the surface, while good corrosion resistance was obtained at 30 minutes. The thickness of the layer formed was directly proportional to the coating time, increasing from 13.06 µm at 10 minutes to 18.55 µm at 60 minutes. In contrast, the tensile strength showed a different trend of results at 10 minutes, reaching the highest tensile strength of 1684 MPa; however, the tensile strength decreased at 30 minutes and 60 minutes. This decrease in tensile strength value was due to the number of hydrogen atoms formed during the dehydrogenation process. These atoms diffuse and become more entrapped in the steel's atomic structure with longer plating times. This difference in duration results in the dehydrogenation process having different rates of complete removal of trapped hydrogen atoms at each time interval, resulting in a decrease in tensile strength.
Co-Authors Adinda Fadhila Adnan Rakhmadi Ramadhan Ajeng Ayu Milanti Alda Diva Meidina Aqil Murtadho Bintoro, Waluyo Musiono Budi Triyono Budi Triyono Defrianto Pratama Destri Muliastri Dewi, Yunita Citra Fitri Nur Indah Sari Hasanah, Rahmawati Heri Widiantoro Ilham Azmy Januar Nur Rohmah Suprihartini Lesmana, Prayoga Musyafak Musyafak Naufal Afif Pasya, Azdane Peprial Indika Prasetyo Prasetyo Prayadi, Aditya Anggara Riovano Putranto Rudi Rudiana Rudy Yuni W setiawan, Dibyo Slamet Sutjipto Sri Widarti Syafiq Ade Priyatama Tantan Sholahuddin Undiana Bambang Vania Tingting Sirenden Widiatmoko, Rudy Yuni Zainuddin Zainuddin Zainuri (DOI: 10.12962/j24604682.v12i2.1331), Mochamad Zen, Elfiah Fadhilah Zuhri, Muhammad Rizki