| Summary: | 碩士 === 大同工學院 === 化學工程學系 === 84 === In this study, the main purpose is to discuss the effects
of sealing types by cold sealing and cold with additives on the
properties of oxide film which is obtained in the anodizing
process of aluminum A1100 by pulse current method. Three kinds
of sealing type, such as cold sealing without additives,
coldsealing with additives and hot water sealing are compared.
The anodizing process is operated at constant voltage of 20V
(various pulse current parameters are applied) in 10vol%
sulfuric acid with bath temperature of 25℃. And the unsealed
anodic oxide film with maximum microhardness of 275Hv can be
obtained under the condition of 60% duty cycle, 500Hz frequency
and 30min anodic durationtime. Cold sealing by nickel fluoride
at room temperature is better than thatby other nickel salts. A
sealed film (anodic duration time:20min) with weightgain of78.2
mg/dm2 and microhardness of 275Hv can be obtained under the
sealingconditions of 20℃, pH=5, 5g/L nickel fluoride and 30min
sealing time. The maximum value of gloss 27.8 can be obtained at
sealing temperature of 10℃. When0.3g additives of aminopropyl
triethoxysilane is added into the sealing solution of 5g/L
nickel fluoride, the microhardness of 325Hv can be obtained.
From the phosphoric-chromic acid dissolution test and acetic
acud / sodium acetate dissolution test, result can be obtained
that the better sealing quality is inthe order of cold sealing
with additives>cold sealing without additives>hot water sealing.
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