Electrodeposition Ni/Cu Pada Baja Karbon
Daftar Isi:
- Electrodeposition or electroplating is a process of coating metal with other metals in an electrolyte solution which is electrified. Electroplating process is widely used for the coating of metal on metal components because the process is cheap and simple operation. Coating by electroplating techniques is already widely tried to manufacture a single layer such as a layer of chrome, or multi-layered with a variety of lining materials. In recent years, coating of different materials attracts attention because it can be used to modify the surface properties of materials, mechanical properties, physical and chemical. A layer of Nickel-copper (Ni/Cu) is a potential candidate as alternative materials for application in the field of pipe heat exchangers (heat exchanger), pressure vessels, installation of marine vessels, protective oxidation electronics, and magnetic component materials. This is caused by the properties of Ni-Cu that has good corrosion resistance, unique magnetic properties, hgih tensile strength with high ductility. This study aims to determine the effect of electrical voltage of the coating of Ni/Cu on the microstructure, surface hardness and wear resistance of the surface of the product. Coating research was conducted by the experimental method using carbon steel electrodes ST 40 as the substrate, that was shaped into a cylinder with a diameter of 16 mm and a thickness of 3 mm. The electroplating process was carried out using a DC current source with Ni nickel solution composed of Nickel sulfate, Nickel Chloride and Boric Acid. Mean while, the copper solution was composed of CuSO4 and aquades. In the electroplating process of Ni, the parameter process was kept constant using a voltage of 2.3 Volts and a dip time of 30 minutes. In the electroplating process of Cu, the voltage was varied using 1.3, 1.8, 2.3, 2.8, and 3.3 Volts, with a dip time of 30 minutes. The characteristics of the coating product was done by micro photograph using optical microscope (type Euromax Bolland UNS ) in order to determine the thickness of the coating. The measurement of hardness was done by a micro-vickers (TTS unlimitedHWMMT - X7 UNS ) with a compressive force of 50 gf with a comprresion time of 10 seconds. The wear test was conducted using a tool wear (type Ogoshi testing machine UGM ) for 30 seconds with a load 19.08 kg. The result of micro photograph of the surface cross section shows that the increase in the voltage of 1.3, 1.8, 2.3, 2.8, and 3.3 Volts increased the Cu layer thickness, which ranged from 28.7 μm to 36.4 μm. The result of hardness against the surface of the Cu layer shows that the voltage increase enhanced the hardness of Cu surface from 125.13 HV to 137.03 HV. The wear test shows that the surface wear on the Cu layer rose, ranging from 7.62×10^(-6)mm2/kg to 2.26×10^(-6)mm2/kg.