Study Comparative of Corrosion Rate Scrap Aluminium in Chloride Acid (HCl) and Natrium Chloride (NaCl) Solutions

Abstract

Scrap aluminium is waste aluminium, the result of recycling that can be used as an alternative raw material with consideration of cheap and affordable prices. The use of aluminium scrap has been widely used both on a large scale such as the automotive industry, ships, aircraft, construction, etc., as well as on a small scale such as household appliances. Chloride acid is used in the process of purifying salt, cleaning porcelain, and as a stain remover on kitchen utensils, and sodium chloride, known as salt, is very corrosive due to the presence of chloride ions. The corrosive nature of chloride ions can be influenced by the concentration and duration of immersion, so it is necessary to research changes in the corrosion rate caused by the concentration and time of immersion. This study uses a method of immersion with weight loss where the specimen is immersed in HCl and NaCl with a concentration of 0. 1%; 0. 3%; and 0. 5% with an immersion time of 5 days, 10 days and 15 days. The results showed that the highest corrosion rate of HCl occurred at 15 days immersion with a concentration of 0. 1% at 1542. 314 Mpy, and the smallest corrosion rate at 5 days with a concentration of 0. 5% at 181. 09 Mpy. For the largest NaCl corrosion rate occurred at 15 days immersion with a concentration of 0. 1% from 101. 171 Mpy, and the smallest corrosion rate at 5 days immersion with a concentration of 0. 5% 41. 793 Mpy.