Applied Chemical Engineering

Analysis of the effect of sandblasting on the surface roughness and coating adhesion of ASTM A36 plate

Oki Suprada Ompusunggu

Department of Mechanical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Medan, 20155, Indonesia; Material Failure Analysis at Tropical Area Research Centre (MAFATA-RC), Universitas Sumatera Utara, Medan, 20155, Indonesia

Riky Stepanus Situmorang

Department of Mechanical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Medan, 20155, Indonesia; Material Failure Analysis at Tropical Area Research Centre (MAFATA-RC), Universitas Sumatera Utara, Medan, 20155, Indonesia

Pramio Garson Sembiring

Material Failure Analysis at Tropical Area Research Centre (MAFATA-RC), Universitas Sumatera Utara, Medan, 20155, Indonesia

Aldi Maulana Sidik

Department of Mechanical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Medan, 20155, Indonesia; Material Failure Analysis at Tropical Area Research Centre (MAFATA-RC), Universitas Sumatera Utara, Medan, 20155, Indonesia

Edbert Vincent Salim

Department of Mechanical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Medan, 20155, Indonesia; Material Failure Analysis at Tropical Area Research Centre (MAFATA-RC), Universitas Sumatera Utara, Medan, 20155, Indonesia

DOI: https://doi.org/10.59429/ace.v9i2.5922

Keywords: sandblasting; surface roughness; coating; ASTM A36 Steel; aluminum oxide

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Abstract

The aim of this research is to examine the effect of variations in spraying pressure and distance on the surface roughness and coating quality of ASTM A36 steel. The method used is by comparing the results of the sandblasting using 60 mesh aluminium oxide abrasive material with a shooting angle of 90° at a distance of 5 cm and 10 cm with pressures of 4, 6 and 8 bar. Surface roughness and paint adhesion test is then done on the specimens. The roughness test showed that increasing sandblasting pressure did not have a direct correlation to the increase in surface roughness. Conversely, as the sandblasting distance increase from 5 cm to 10 cm, affected the surface roughness decreases. The highest mean Ra, Rp and Rz value were obtained from a nozzle distance of 5 cm at pressure of 8 bar with value of 4.125 μm, 11.746 μm and 25,773 μm respectively. Paint adhesion testing showed that the higher surface roughness did not necessarily result in better paint adhesion of the steel plates. Instead, surface morphology and coating thickness played a more dominant role in adhesion strength. These findings indicate that variations in pressure and distance during sandblasting significantly influence the surface texture and coating performance of ASTM A36 steel.

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