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.
Highlights
The use of recycled materials is currently widely used because raw materials are difficult and expensive
Andrayani (2017), examining the corrosion rate on aluminum before and after coated with cellulose acetate (CA) with immersion media hydrochloric acid (HCl) solution for 5 minutes showed that the corrosion rate that occurred very quickly where the lowest concentration (Molar) reached 0.05324 mm / year, This is because the HCl solution is a strong acid solution and the corrosion rate that occurs faster, the greater the concentration of the faster corrosion rate
Tests carried out by Immersion use the ASTM G31-72 standard with the weight-loss method, where the data obtained is the difference in initial weight reduced by final weight
Summary
The use of recycled materials is currently widely used because raw materials are difficult and expensive. Before becoming a raw material, the casting process is first carried out. Casting is one of the processes of forming raw materials or work pieces by melting or melting metal in a melting furnace which is put into a mold. Casting is a manufacturing process that uses metals and liquid molds to produce parts with shapes that are close to the final geometric shapes of. Certain parts of the metal act as anodes, while other parts act as cathodes. Electrons flow from the anode to the cathode so that corrosion occurs (Trethewey & Chamberlain, 1991). (Purnomo, 2004), conducting research by melting 320 aluminum alloys and pouring them into metal molds. The results of tests carried out explain that re-casting will reduce the tensile strength and impact strength of the material. The results of tests carried out explain that re-casting will reduce the tensile strength and impact strength of the material. Andrayani (2017), examining the corrosion rate on aluminum before and after coated with cellulose acetate (CA) with immersion media HCl solution for 5 minutes showed that the corrosion rate that occurred very quickly where the lowest concentration (Molar) reached 0.05324 mm / year, This is because the HCl solution is a strong acid solution and the corrosion rate that occurs faster, the greater the concentration of the faster corrosion rate
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