Pengaruh Variasi Tekanan Penyemprotan dan Jenis Material Abrasif terhadap Kekasaran Permukaan Baja ASTM A36 pada Proses Sandblasting

Abstract

Sandblasting is a process of shooting abrasive particles onto a material surface clean dust, paint, rust, oil and create a texture on the surface of the material so that the protective layer can stick better. The purpose of this research is to examine the effect of spraying pressure variation and the use of aluminum oxide and silica abrasives and firing angle on the surface roughness of ASTM A36 steel. The method used, namely by comparing the results of the sandblasting process with aluminum oxide abrasives and silica grit 60 at pressures of 5 and 7 bar with angles of 45o and 90o in the same test parameters. The test analysis used is surface roughness tester, sandblasting test, and scanning electron microscope. The results of the highest Ra value in aluminum oxide abrasive material with a 90o angle of 7 bar pressure of 3.819 μm, and the lowest Ra value in aluminum oxide media with a 45o angle of 5 bar pressure of 2.593 μm. The highest Ra value in silica abrasive material with a 90o angle of 7 bar pressure is 3.651 μm, and the lowest Ra value in silica media with a 90o angle of 5 bar pressure is 2.686 μm. so it can be concluded that variations in pressure, firing angle and abrasive materials used in the sandblasting process have a significant effect on surface roughness