Pengaruh Ukuran Butir Steel Shot dan Tekanan Nozzle terhadap Karakteristik Permukaan dan Laju Korosi Baja A36 Hasil Proses Dry Abrasive Blasting

Nandhi Lathief Ibrahim, Frizka Vietanti

Abstract

This study investigates the effects of steel shot abrasive particle size and nozzle pressure on the surface characteristics and corrosion behavior of ASTM A36 steel subjected to dry abrasive blasting. Two steel shot sizes, S390 (1.2 mm) and S460 (1.4 mm), were employed, while nozzle pressures were varied at 6, 7, and 8 bar. The blasting results showed that all specimens achieved the Sa 2½ surface cleanliness standard, indicating effective removal of surface contaminants. Surface roughness measurements revealed that increasing both abrasive particle size and nozzle pressure generally resulted in a rougher surface. The highest average surface roughness was obtained using S460 steel shot at a nozzle pressure of 8 bar, reaching 104.44 ± 6.81 µm before corrosive immersion and increasing to 117.33 ± 0.54 µm after immersion. The corrosion behavior was subsequently evaluated using the weight loss method. Consistent with the surface roughness results, the highest average corrosion rate was also observed for specimens treated with S460 steel shot at 8 bar, reaching 88.83 ± 24.17 mpy. These findings demonstrate that variations in steel shot size and nozzle pressure significantly influence the surface condition of ASTM A36 steel and its subsequent corrosion performance, with larger abrasive particles and higher blasting pressures producing rougher surfaces that are associated with higher corrosion rates.

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