PERFOMANCE ANALYSIS OF ANODIZING PARAMETER VARIATIONS ON THE HARDNESS AND WEAR RESISTANCE OF PROPELLERS MANUFACTURED FROM ALUMINIUM ALLOY SCRAP

The use of aluminum as a transportation component has been widely used because it is light, easy to shape and resistant to corrosion in dry environments. Aluminum Scrap is used material or aluminum waste that can be recycled and reused in the production process. In previous research, the aluminum scrap casting process was carried out in the shape of a propeller but there was porosity. So a surface coating process with anodization is required. The propeller used was cut to a size of ± 2 cm x 2.5 cm x 0.5 cm for hardness testing based on ASTM E92 and wear with a size of
± 6 cm x 3 cm x 1 cm based on ASTM G 99 and the anodization process with 22 ml sulfuric acid solution and 178 ml distilled water with time variations of 30, 45 and 60 minutes. This research aims to find out how the variation in anodization time for propellers made from aluminum scrap affects the hardness and wear and tear. The results of hardness testing using the Vickers test on the surface of aluminum scrap after anodizing had the highest hardness of 96.52 HV, with a time of 60 minutes. Meanwhile, the untreated one had a hardness of 81.68 HV, while for wear, after being tested, the sample that was most resistant to wear was the one without treatment with an average trace width of 2.19 mm and specific abrasion of 1.75 (10−6mm3/ mm).The anodized sample that was most resistant to wear was treated with a 60 minute treatment time with an average trace width of 2.27 mm and a specific abrasion of 1.94 (10−6mm3/ mm), When observed under the SEM at magnifications ranging from 50X to 2000X, the anodized layer was not yet fully formed. Both a barrier layer and a porous layer were formed after 60 minutes.
Keywords, aluminum scrap, Anodization, hardness, wear, propeller.