Cu35Zn is a metal with a copper matrix that has the properties of forgings and has good corrosion resistance. Cu35Zn is commonly known as brass metal. Brass is widely used by industry to make various metal components. Brass for engine components must be able to withstand statistical and dynamic loads. One of these components is a ship propeller made of brass. These components must be able to withstand axial loads and have high corrosion resistance. To improve physical and mechanical properties, surface treatment needs to be done with the shot peening method. Shot peening is done with steel shot ball with a diameter of 0.5 mm with a hardness of 40-50 HRC. Shooting distance between nozzles and 100 mm specimens for 4, 6 and 8 minutes. The shot peening pressure varies 7, 8 and 9 bars. Corrosion tests according to the ASTM G5-94 standard are carried out in a 3.5% NaCl solution, instead of seawater. The results showed an increase in the best corrosion resistance of 0.028 mpy at 8 Bar shot pressure, which is 2.8 times compared to raw materials.
Proses produksi pembuatan pupuk organik masih dilakukan secara manual, sehingga proses pembuatan pupuk membutuhkan waktu yang lama. Proses pencampuran bahan pupuk kandang dilakukan pengadukan dengan menggunakan cangkul sehingga bahan campuran pembuatan pupuk kandang menjadi tidak rata. Agar hasil pencampuran bahan pupuk kandang menjadi rata dan lebih efisien dalam pengerjaan maka dirancang mesin pengaduk pupuk, dan dilanjutkan pelatihan pengoperasian mesin, pelatihan perawatan mesin, dan pelatihan pengemasan produk untuk keperluan peningkatan pemasaran. Mesin pengaduk menggunakan sumber penggerak motor bakar 6 PK berbahan bakar bensin, motor bakar terhubung dengan poros pengaduk menggunakan pully dan belt. Pengaduk berputar dengan gerakan mencampur dan membalik kotoran sapi dan campurannya sehingga menghasilkan campuran pupuk organik yang mempunyai kandungan yang rata. Dengan adanya mesin pengaduk pupuk organik dan dilakukan pelatihan melalui program Kemitraan Masyarakat dapat membantu kesulitan yang dihadapi mitra sehingga dapat menaikan jumlah produksi dan dapat menambah kesejahteraan mitra.
This study aims to determine the effect of installing modified copper C-SiO2-ZSM5 in the exhaust, installing modified copper in the exhaust to reduce CO and HC. The two methods used to reduce CO and HC exhaust emissions are as follows: the first method is by mixing fossil fuels with ethanol. The fuel used is a mixture of gasoline + ethanol with variations of gasoline, E10, and E20. The second method is to provide a CO and HC reformer catalyst made of modified copper with the addition of SiO2 and MZM5 as much as 10% and 20%, respectively. The test uses a four-stroke two-wheel motor in a neutral gear position. Exhaust emission data retrieval is at 1500, 3000, 5000, 7000, 9000 rpm. With gasoline fuel mixed with ethanol with E 10 and E 20. There is a decrease in CO at each engine speed in each fuel variation, because the more ethanol content, the greater the supply of O2 in combustion because ethanol has oxygen bonds that can increase combustion. The emission of CO and HC gas on gasoline-fueled motors are greater than those of E 10 and E 20 motors. The use of a copper converter catalyst SiO2-C-ZSM5 is very significant and can reduce CO levels for gasoline fuel from the highest value of 4,7% to 2.82%, gasohol fuel E 10 with the highest value of CO 3.02% decreased to 1.2% and gasohol fuel E 20 the highest value of CO 2.78% decreased to 0.17%. Changes were seen visually on the surface of the copper used for the CO and HC reduction test, the surface copper became darker in color, especially when testing using gasoline. When using a mixture of ethanol and gasoline, copper is purplish brown color.
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