THE STUDY OF ELECTROCODEPOSITION PROCESS VARIABLES TO THE HARDNESS OF NICKEL-OBSIDIAN ELECTROCOMPOSITE LAYER

• Main Author: Hauna Firdausi, Salimah
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/79255
• Institution: Institut Teknologi Bandung

Hardness is an important characteristic in a manufactured product. Increasing the surface hardness of manufactured products can be done through the formation of a composite layer using an electrocodeposition process. The purpose of this study is to study the effect of the electrocodeposition process variables in the formation of the composite layer. In this study, a metal matrix composite coating experiment was carried out on low carbon steel and samples of coating results was tested. The composite coating experiment was carried out by applying electric current to a low carbon steel electrode in a nickel-obsidian electrolyte solution. Process variables observed were particle size, particle concentration, current density, and total nickel concentration in the electrolyte solution. Tests carried out include XRD test, microvicker hardness test, observation with an optical microscope, and observation with a Scanning Electron Microscope. The experimental results show that changes in process variables affect the hardness of the composite layer on the sample surface. The increase in current density up to 10 A/dm2 increases the hardness value. Increasing the particle concentration and decreasing the particle size decreases the layer thickness. The greatest hardness value, which is around 541 HV, is obtained when the current density is 10 A/dm2, pH 3-4, temperature 50 ?, particle size below 53 ?m, particle concentration 25 grams/L, and ion concentration 50 grams/L.