Analisis Laju Korosi Alumunium 5052 Dalam Media Air Laut, CH₃COOK, dan KOH, Serta Implikasinya Terhadap Keandalan Material Wingtip Pesawat

Abstract

This study analyzes the corrosion rate of Alumunium Alloy 5052 in three corrosive environments: seawater, CH₃COOK (potassium acetate), and KOH (potassium hydroxide) solutions using the weight loss method. Aluminum 5052 specimens with a surface area of 52 cm² were immersed for 7, 14, and 21 days. The corrosion rate was calculated based on the ASTM G31-72 standard. The results indicated that the highest corrosion rate occurred in seawater (0.86 mm/year after 7 days), while the lowest rate was found in the CH₃COOK solution (-0.0029 mm/year after 21 days). The KOH solution exhibited a negative corrosion rate, suggesting the formation of a stable passive oxide layer. Increasing immersion time generally decreased the corrosion rate in all media. These findings show that Aluminum Alloy 5052 has good corrosion resistance in CH₃COOK and KOH solutions but is more susceptible in seawater. Therefore, its application as an aircraft wingtip material requires additional surface protection such as anodizing or anti-corrosion coating to enhance durability in marine environments.