This paper explains the results of the initial stage of investigation of atmospheric corrosion on structural steel in industrial zones. Investigation is carried out on two shape profile of low carbon steel that is widely used for the construction of structures, namely sheet, and elbow. Corrosion rate measurement process and preparation were carried out based on ASTM G-50 and ASTM G-1 standards, with a total exposure time of six months in Medan Deli District, Medan, North Sumatra. The results of this initial stage of the investigation show that the average corrosion rate of low carbon steel for each profile is different, but overall it is still in the “good” category. This investigation will be continued for up to twelve months to obtain more complete data.
Pencemaran udara dari emisi gas buang kendaraan bermotor semakin meningkat, sehingga perlu upaya pengendalian emisi gas buangnya. Mengingat bahaya emisi gas buang, maka perlu usaha-usaha untuk mengendalikan dan mengurangi pencemaran udara agar dampak negatif bagi manuisa dan lingkungan dapat dikurangi. Salah satu teknologi rekayasa sebagai wujud dari kontrol emisi kendaraan adalah merekayasa dan modifikasi saluran gas buang. Rekayasa dan modifikasi diharapkan dapat dibuat alat yang akan mampu dan berfungsi untuk mereduksi bahaya gas buang. Peneliti akan melakukan eksperimen dan pembuatan alat serta pengujian awal pada satu kendaraan bermotor untuk melihat dan mengamati komposisi gas buang yang dihasilkan dari knalpot. Unsur yang akan diamati adalah nilai CO, nilai HC, dan nilai CO2 sebagai data pembanding. Alat yang akan digunakan untuk mengamati dan melihat unsur-unsur tersebut adalah alat Gas Analyzer. Alat ini salah satu alat instrument yang bermanfaat untuk mengukur porsi dan komposisi dari gabungan gas. Dari hasil pengujian dan analisa didapat data pada uji emisi gas buang dengan putaran mesin rata-rata 500 rpm, dan dengan suhu tabung luar knalpot 40 0C hingga 45 0C. Setelah pengujian model knalpot standart, kemudian pengujian model knalpot rekayasa yang ditambahkan 50 gr, 70 gr, dan 90 gr skrap dari besi ST-40 diperoleh kesimpulan yang paling baik untuk menurunkan dan mengurangi bahaya emisi gas buang adalah knalpot rekayasa yang ditambahkan 90 gr skrap dari besi ST-40. Dan jika dibandingkan dengan knalpot standar, unsur CO turun hingga 72,35% dan unsur HC turun hingga 58,70% serta unsur CO2 turun hingga 74,28%.
The objective of this study is to carry out an atmospheric corrosion analysis on low carbon steel in the form of plates and elbows in the port area of Belawan. The exposure of the test specimen was carried out at five locations for 12 months. The location points are notated as A, B, C, D, and E. The process of specimen exposure and data collection followed the ASTM G-1 and ASTM G-50 standards. The measurement results indicated a slight difference in the corrosion rate at each location. Location C and D have the highest corrosion rate and location A has the lowest corrosion rate. Meanwhile, for locations B and E have a corrosion rate value that is not much different from location A. This difference in value is probably a consequence of the distance from the exposure location to the seaside. Locations C and D are adjacent to the seaside while the other locations are not. The steel plate has an average value of corrosion rate 0.2214 mpy and steel elbow has a rate of 0.2412 mpy. From the measurement results obtained, the two specimens exposed at each location are still in the "outstanding" category.
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