Author : A. Ajeel, Sami
Improving Anodizing Efficiency by Adding Different Amounts of Aluminum Powder to Anodizing Electrolyte for Pure Aluminum and Aluminum Alloy (6063)
Engineering and Technology Journal,
2008, Volume 26, Issue 7, Pages 842-865
Different amounts of aluminum powder (5, 7, 9 and 11g/l) were added to sulfuric
acid solution of the specimens under ideal conditions previously obtained (1) and the
effect of these additions was studied to find out it's benefit on anodizing efficiency for
pure aluminum and aluminum alloy (6063).
The specimens were examined in different conditions using optical microscope,
roughness and hardness measurements.
The study shows the anodizing process was improved by adding aluminum
powder with ideal conditions and the best value of aluminum powder was 9g/l,
where the thickness improved from 72.25μm at ideal conditions to 81.25μm with
adding 9g/l aluminum powder and the coating ratio improved from 1.481 at ideal
conditions to 1.541 with adding 9g/l aluminum powder for pure aluminum, while the
thickness improved from 74.56μm at ideal conditions to 82.29μm with adding 9 g/l
aluminum powder and the coating ratio improved from 1.417 at ideal conditions to
1.471 with adding 9g/l aluminum powder for aluminum alloy (6063).
The study also shows that the effective anodic current efficiency was increased
about 12.50% when adding aluminum powder of 9g/l compared with ideal conditions
for pure aluminum, while this value was increased about 10.20% when adding
aluminum powder of 9g/l compared with ideal conditions for aluminum alloy (6063)
without adding aluminum powder.
It is found that the surface roughness and hardness value of specimens with adding
aluminum powder of 9g/l gives the best result compared with the specimens at ideal
conditions and bare specimens.