Studi Eksperimental Tentang Pengaruh Variasi Rapat Arus Pada Hard Chrome Electroplating Terhadap Karakteristik Permukaan Baja Karbon Rendah

The objective of the research is to investigate the effect of hard chrome electroplating on low carbon steel surface characteristic. This experimental research used low carbon steel as material that has been coated by hard chrome electroplating, chromium powder, and Pb alloy as cathode. The instrument for the research were rectifier, hardness testing machine LECO M-400-H1, optical microscope and digital camera. This research had been performed by making variation of current ((15 A/dm2, 30 A/dm2, 45 A/dm2 and 60 A/dm2).The result of this research shows that the maximum hardness of low carbon steel after coated by hard chrome electroplating was 576,50 VHN, when hard chrome electroplating had been performed on current 45 A/dm2. Beside that, on the same current (45 A/dm2) also gained maximum chrome layer (38,65 µm)

Pengaruh Rapat Arus Dan Temperatur Elektrolit Terhadap Ketebalan Lapisan Dan Efisiensi Katoda Pada Elektroplating Tembaga Untuk Baja Karbon Sedang

Acid copper electroplating has a quite wide current density and electrolyte temperature range, allowing the diversity of the coating result. The specimen is medium carbon steel AISI 1045, pure copper has a role as anode, and sulfuric acid plays the role of electrolyte.Electroplating process conducted by the variations of current density 2, 3, 4, and 5 A/dm2, and electrolyte temperature 30, 40, and 50oC, which lasted for 10 minutes. The layer resulted was measured its mass and thickness, and then we can obtain its cathode efficiency.From the research, the actual coating thickness deviation obtained against its theoretical value is 0.42 to 18.37%. While the cathode efficiency resulted is between 78.33 to 97.78%. Based on coating thickness and cathode efficiency, the optimum conditions for electroplating process is gained at current density 3 A/dm2 and electrolyte temperature 40oC

Pemanfaatan Partikel Tempurung Kemiri Sebagai Bahan Penguat Pada Komposit Resin Poliester

The objective of the research is to investigate the effect of composition ratio of polyester as matrix and Aleurites moluccana willd particles on mechanical properties (hardness,flexure strength and tensile strength) of composite.This experimental research used Aleurites moluccana willd particles as reinforced material and polyester as resin.The instrument for the research were universal testing machine (UTM), hardness testing mac hine. This research had been performed by making variation of composition ratio of resin and Aleurites moluccana willd particles (30 % :70%, 40% :60 %, 50 % : 50% and 60% :40%).The result of this research show that the maximum hardness of composite was54,1 HRL. The maximum flexure strength was 33,62 N/mm2 and the maximum tensile strength was 16,97 N/mm2. The maximum value of hardness, flexure strength and tensile strength had been achieved on composition ratio 40 % :60 %

Pengaruh Perlakuan Alkali Terhadap Kekuatan Tarik Serat Tandan Kosong Kelapa Sawit Untuk Digunakan Pada Komposit Serat Tkks

Empty Palm bunches (TKKS) is one of the solid waste generated by industrial palm oil plantations which contain lots of fiber and is one of the natural fiber source that the availability of abundant in Indonesia, especially in the province of Lampung. TKKS fiber can be used as an alternative amplifier to composite materials. This research was conducted to determine the influence of the chemical composition of TKKS fiber and know the tensile strength from TKKS fiber by doing a tensile test. Alkaline treatment NaOH 5% given to fiber to separate lignin and contaminants that contained in fiber so that it can increase the tensile strength fibers. TKKS fiber is obtained processing palm oil factory by the process of boiling oil palm fresh fruit bunches with a pressure of 2.5 until 3atm at temperature 130 C during 50 – 60 minutes. TKKS already parsed and then selected and measured with a length of 6 cm and a diameter of 0.2 mm. And then given an alkaline NaOH 5%. In this research on the treatment of alkaline NaOH 5% provided that treatment during 0 hours (without treatment), 2 hour, 4 hour, 6 hour. Results from the study found that fiber tensile strength affected by the chemical composition on the fiber, the higher the tensile strength of the cellulose content is increasingly high. Tensile strength in fiber with alkali treatment 2 hours of 0,03528 Mpa, 0,3996% strain, 0,088288 MPa elasticity modulus, if compared with fiber without alkali treatment of 0,018946 MPa tensile strength, 0,2056% strain, 0,092149 MPa elasticity modulus. This is due to the levels of cellulose fibers with alkali treatment 2 hours increased by 58,2808%, if compared with fiber without alkali treatment by 13,2848

Pengaruh Variasi Ukuran Partikel Marmer Statuari Terhadap Sifat Mekanik Komposit Partikel Marmer Statuari

Manufacture a composite material with a matrix resin epoxy and marble statuary powder as filler is one industry-utilization of waste. Mechanical properties of the composite material is influenced by the particle size of the particles. variations in particle size would form different mechanical properties. This research was conducted to investigate the effect variations in particle size on the mechanical properties of the composite particles. In this research variation in particle size marble statuary used is 60 mesh, 100 mesh, 140 mesh and 200 mesh. Resin used is epoxy resin, and composition of the volume ratio between the matrix and the particles used in research was 80%: 20%. The method is used in the manufacture of composite hand lay-up method. Tests performed in this research is XRD testing on solid marble, bending strength, hardness, and SEM. XRD results obtained from the testing phase identified in the marble statuary are Ca2O5Si , CaCO3, CaO, SiO2 , MgO , MgCO3 , and SiC. Hardness value of composite particles of marble is 22.3 to 48.33 HB, and flexural strength values of composite particles of marble statuary is from 13.89 to 38.89 N/mm . Particle size is good for filler in the composite is 140 mesh particles. Marble composite particles 140 mesh particle size has a flexural strength and hardness highest, because SEM photograph composite of 140 mesh particle distribution in the matrix evenly, and there is a good bond between the matrix and particles of marble statuary