Constant Voltage Anodizing of Mg‐Al Alloys in KOH ‐ Al ( OH ) 3 Solutions

摘要: Constant voltage anodizing of binary Mg-Al alloys containing 2, 5, 8, and 12% aluminum was studied. Anodizing conducted in a bath 3 M KOH + 0.6 KF 0.21 Na PO 4 with additions 0.013, 0.064, 0.13, 0.4 Al(OH) . A thin amorphous film formed during the first stage anodizing. Prolonged caused local breakdown crystallization initially anodic films. The chemical composition newly crystalline determined. elements were mainly magnesium, aluminum, oxygen. Aluminum penetrated into both from electrolyte alloy substrate. phase films found to be mixture MgO MgAl 2 O