| Summary: | 碩士 === 高苑科技大學 === 化工與生化工程研究所 === 101 === Electroless plating is used to prepare Si film on AZ91D ally before
micro arc oxidation process. In this work, oxide film on AZ91D alloy is
detected hardness, morphology, crystalline, composition and corrosion
resistance.
When AZ91D alloy immerses during 24 hours in eletroless process
to get a high Si content of 3.78 atm.% and hardness of 285Hv. Moreover,
the oxide film has a better OCP value of 0.
According to the results, the optimal preparation parameter to form a
better corrosion resistance of oxide film on AZ91D alloy is up-limit
potential of 170V, low-limit potential of 30V, pulse-plating period of
50ms, reveres-plating of 50ms and 12000 duty cycles. The optimal
preparation condition can form a low corrosion current of 0.011mA/cm 2
with long passivation potential from -2 to 10 V.
Keywords: AZ91D, Magnesium alloy, Silicon oxide, Oxide film, Electroless,
Corrosion resistance
|
|---|
