Painting is a process to make a thin layer of paint over an object. Factors to beautify the results of painting on the vehicle body are given a layer of varnish. To produce a quality varnish coating, it is necessary to pay attention to the ratio between the varnish-solvent used and the drying method used. This study aims to determine the mixture of varnish - solvent (1:0,1 and 1:0,2) with a drying temperature method of 40°C, 60°C, and 80°C on gloss, thickness, and adhesion to the motor vehicle body. The lower the oven temperature, the higher the gloss and the thicker the coating. The best adhesion at the oven temperature of 40ºC and 60ºC on all varnish-solvent compositions. The higher of the solvent mixture would result glossier and less thickness of the layer form.
ABSTRAK Penggunaan alumunium yang dilapis tembaga akan lebih ekonomis jika dibandingkan dengan pengunaan tembaga pejal. Saat ini penggunaan tembaga dalam dunia medis banyak dibutuhkan,karena dapat berfungsi sebagai anti bakteri (oligodinamik). Dalam penelitian ini akan dilakukan proses elektroplating dengan pelapis tembaga di atas substrat alumunium. Pada proses elektroplating tersebut akan ditambahkan juga proses pengadukan sebesar 300 rpm. Hal ini dilakukan agar distribusi ion merata. Pada proses elektroplating tembaga menggunakan kuat arus 20 mA,voltase 1,2 V selama 30 menit dengan komposisi larutan CuSO4 220gr/L dan H2SO4 20ml/L. Bedasarkan hasil uji korosi yang di dapat dengan diaduk maka laju korosinya meningkat. Laju korosi terendah pada substrat yang telah di lapisi dengan tembaga tanpa pengadukan. Terlihat pergeseran potensial korosi (Ekorosi) sekitar ±0,4V ketika dilapisi dengan tembaga, baik dengan pengadukan maupun tidak. Permukaan lapisan tembaga terlihat lebih seragam ketika dilakukan pengadukan saat proses elektroplating. Kata kunci : Elektroplating,Tembaga, Nikel, Alumunium, Magnetic stirrer
ABSTRAK Proses hardfacing menggunakan jenis SMAW, dengan polaritas DC+, arus yang digunakan 130A, elektroda HV 350. Setelah spesimen di las (satu lapis), kemudian langsung dicelup ke dalam air. Setelah mendingin, spesimen grinding, amplas kemudian dilakukan heat treatment 1000 oC holding time 10 menit dan quenching dengan media clay. Spesimen yang telah di quenching sebelumnya dipoles dan etsa dengan nital lalu dilakukan pengujian kekerasan dan mikrostruktrur. Nilai kekerasan yang didapatkan dari sebelum dan sesudah quenching dengan media clay adalah sebesar 250 dan 296,93 HV Kata kunci: Hardfacing, SMAW, Clay, Struktur Mikro dan Kekerasan
This study aims to determine the distance and braking time on 125cc motorcycle vehicles by using two types of callipers, namely single-piston and double-piston callipers. The research method uses experimental methods. There this method will compare 2 variables to get the results of the study by sulking on SNI Braking. By varying the two callipers of different types and using the brake pressure gauge, stopwatch, and meter to find out the pressure, time, and distance when conducting the test, the results of the test are calculated by the formula of regularly changing straight motion force (GLBB) slowed down, braking force and braking efficiency formula in order to get more valid results. Based on the results of this research report, it was concluded that the 2-piston callipers are superior to the 1-piston callipers in terms of average mileage of 0.51 m (9.81 m – 9.30 m) in front wheel braking and average mileage of 0.42 m (4.63 m – 4.21 m) in rear wheel braking and average stopping time of 0.21 s (2.51 s – 2.30 s) with the average effect of braking efficiency value of 5% (57% - 52 %) on front wheel braking and the average time for 0.21 s (1.58 s – 1.37 s) with the average effect of efficiency value of 5 % (47 % - 42 %) on rear wheel braking. So that makes 2-piston callipers better used in 125 cc vehicles than 1-piston callipers in terms of braking aspects.
Abstrak Pada bagian atas cat warna juga dilapisi kembali dengan campuran varnish dan solvent dengan tujuan melindungi dari panas terik matahari serta polutan lainnya. Untuk itu akan dilakukan penelitan variasi temperatur pengeringan untuk melihat karakteristik seperti: kekilapan, kemampuan bending, dan daya lekat. Pelat SPCC dipotong kemudian dilakukan proses pengecatan epoxy dan keringkan. Kemudian dilanjutkan dengan pengecatan dengan warna hitam dan keringkan. Kemudian dilanjutkan dengan pemberian varnish dengan komposisi varnish dan solvent sebanyak 1:0,3. Setelah selesai kemudian dioven dengan variasi temperatur 40, 60, dan 80˚C selama 25 menit. Temperatur 40˚C menghasilkan kekilapan paling tinggi yaitu 98,9 GU, daya rekat baik karena tidak ada cat yang terkelupas serta hasil bending yang bagus karena tidak ada retak. Kata kunci: kekilapan, temperatur, SPCC Abstract Varies drying temperature will be carried out to see the characteristics formed such as gloss, bending ability, and adhesion resistance. The SPCC plate was cut and then carried out an epoxy painting process and dried. Then proceed with painting by giving black color and drying. Then proceed with the provision of varnish with a composition of 1:0.3 varnish and solvent. After completion, it is then baked in an oven with temperature variations of 40, 60, and 80˚C for 25 minutes. The temperature of 40˚C produces the highest gloss, which is 98.9 GU, good adhesion because there is no peeling paint and good bending results because there are no cracks. Keywords: gloss, temperature, SPCC
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