Variation in Current Density of Aluminum Scrap-Based Propeller Anodization to Increase Surface Hardness

Aluminum has the advantages of being lightweight and rust-resistant, and having high strength and durability. Aluminum scrap is a recycled material and is reused in its production process, for example, for propellers. Because it is used in conditions that require good durability, a coating that can increase the hardness and strength of aluminum is introduced. This study used the anodization method with a H2SO4 electrolyte medium and variations in current density of 0.03 A/cm2, 0.035 A/cm2, and 0.04 A/cm2. The anodization time was 45 min. It was found that the hardness of the specimen increased from the initial hardness of 189 HL.