John, S. and Balasubramanian, V.
(1986)
Integral colour anodising of aluminium using alternating current.
Bulletin of Electrochemistry , 2 (5).
pp. 461-463.
ISSN 0256-1654
Abstract
Integral colour anodising of aluminium is carried out by the constant voltage process using alternating
current (A.C.) in an electrolyte containing 40 gll sulphosalicylic acid and 40 mlll formic acid in conjunction
with 510 gll pyrogallol, pyrocatechol, p-aminophenol and metol at 2530°C with operating
voltage between 50 and 80 V. Colours ranging from brownish black, yellowish green, brown, reddish
brown, purple, chocolate and black are obtained. The colour depends on the composition of the alloy
and operating conditions.
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