Microstructure Analysis of Genuine Copper Alloy Coin

Coin characterization analysis (coins) is done by using the test method such as ; Spectrometer XRF, XRD Defractometer, Defrensial Scanning Calorimeter, Scanning Electron Microscope (SEM), Characterization is done in Lab Material Sciences Salemba UI to reveal the nature of coin properties related to mass density, coin base material, particle size of material, heat capacity properties. Qualitatively coins must have public security factors without having to reduce the function and security of the coin itself. The function of characterization testing is to see the superiority of coin material as a means of exchange of trade transactions so that the coin is resistant to impact of scratches, resistant to corrosion when stored in the long term. In the physical configuration test the coin dimension (diameter 27mm, 2mm thick) average coin mass of 7.48 gram / cc. The microstructure test with XRF element in coins is Cu, Ni, Al, P, Mn, Si. XRD test coin is an alloy Cu0.9Ni0.1 degan ring aluminum oxide. AlxOy Hardness CuNi 84.56 HV alloys, and AlxOy 72.55HV SEM test brass alloys show more than 2 kinds of micro grain figure material with almost the same grain size, while the aluminum compound has a grain figure of more than 2 kinds with different sizes.