Can I etch Pure Aluminium using HNO3, H3PO4, CH3COOH, and H2O mixing together? As many portal suggest never keep HNO3 and CH3COOH either nearby or in contact. I am trying to etch Pure Aluminium and Aluminium 5086. I am facing difficulty to reveal microstructure.
Aluminum etching Immerse objects in a bath heated to 85-100°C. Bath composition: 155 cm3 concentrated phosphoric acid, 17 cm3 concentrated sulfuric acid, 13 cm3 concentrated nitric acid, 25 cm3 water, 1 g boric acid, 1 g cupric nitrate. Etching Time: 1-4 min. Rinse thoroughly with water and dry.
Aluminum etching to silver gloss Make up to 2 cm3 of concentrated hydrochloric acid with water to 1000 cm3. In this solution, etch the items until the desired effect is achieved. Rinse with water and dry.
Anodic aluminum oxidation in 20% sulfuric acid
- hard, transparent coating - temperature 10-16oC, current density 1,5-2,0 A/m2, time 30 min,
- normal coating - 18-20oC, current density 1,5-2,0 A/m2, time 30 min,
- thin, transparent (shiny on the surface) coating - temperature 18-20oC, current density 0,5-1,0 A/m2, time 10-30 min.
For SEM images the surface of the sample was polished by electro polishing in a 100 ml HClO4 + 900 ml CH3OH solution at -20 ° C and a voltage of 50 V.
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