High Temperature Corrosion of Monel K-500 Materials Coated with Salts (40%K2SO4+60%NaCl)

• Main Author: Ripandi Nurul Fauji, Deri
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/39493
• Institution: Institut Teknologi Bandung

In the mining industry there are several components in drilling drill tools such as threaded forged fittings and also pipe components that work at high temperatures with salt environments around mining, so that high temperature corrosion in the salt environment cannot be avoided. Material Monel K-500 is a nickel alloy with good corrosion resistance and has mechanical properties that can be improved through the process of strengthening precipitation. To determine the behavior of Monel K-500 at high temperatures and salt environments, a corrosion study of Monel K-500 at temperatures of 450oC, 550oC, and 650oC was carried out with salt (40% K2SO4 + 60% NaCl) with a time variation of 12, 24 and 36 hour. The most severe corrosion occurred at the testing temperature of 650oC with the greatest change in mass was 8.13 x 10-7 gram/mm2, the oxide layer was spalling, the oxide layer thickness was 850.28?m, the corrosion attack depth was 41.227?m and the hardness of the specimen decreased by 54.9% . The corrosion mechanism that occurs in all specimens is intergranular corrosion and the oxide compound formed is Nickel Oxide (NiO). The Monel K-500 still has good corrosion resistance at temperatures of 450oC and 550oC with an exposure time of no more than 24 hours