EFFECT OF VOLTAGE ON THE THICKNESS OF OXIDE LAYER AT ALUMINUM ALLOYS FOR STRUCTURAL BONDING USING PHOSPHORIC SULFURIC ACID ANODIZING (PSA) PROCESS

The aerospace industry mostly uses the aluminum alloys 2xxx and 7xxx series for their fuselage construction, some of them are assembled using structural bonding because it is strong, easy during fabrication process, resistant to corrosion, non-toxic. anodization process a proven surface treatment method bonding. Phosphoric Sulfuric Acid Anodizing (PSA) an eco-friendly alternative as chromate-free solvent technology anodizing that applied thickness oxide layer caused by voltage given in this was evaluated terms corrosion resistance layer's main factor. PSA AA2024 T3 clad carried out at constant concentration 125 g/L phosphoric acid, 80 sulfuric 27 A, temperature 26 28 OC 23 minutes with various voltages. varied 16, 18, 20 VDC. optimum condition 18 VDC, which resulted 2.76 µm.