Effects of Ultrasonic and Rare-earth on the Properties of Anodic Aluminum Oxide Film
|School||Zhejiang University of Technology|
|Keywords||Ultrasonic wave An oxide film Anodization Rare earths Aluminum alloy|
This article describes the aluminum anodizing process , types and applications , anodized aluminum structure , formation mechanism and research progress , especially on the current domestic and international aluminum alloy strengthening effect on rare earth additives , a variety of process by deficiencies . Thesis literature analysis to determine the role of rare earth elements and ultrasonic aluminum anodization process method does not require harsh conditions in order to obtain high-performance oxide film as a means of strengthening . Experiments using industrial aluminum L3 and LY12 hard aluminum containing rare earth salt ( high crystallization sulfate cerium Ce ( SO 4 sub > ) 2 < / sub > .4 H 2 < / sub > O and rare earth salts of sulfuric acid lanthanum La of 2 sub > ( SO 4 < / sub > ) 3 < / sub > .9 H 2 < / sub > O ) sulfuric acid electrolyte anodic oxidation , oxide film performance and found that: the former is superior to that latter, hardness and thickness , respectively up 95HV and 5.4μm ( to industrial aluminum L3 ) is obtained when the rare earth salt for comparison , 30HV and about 3.8μm duralumin LY12 ; rare earth content of about 0.4 ~ 0.5g / L ; included in the composite rare earth salt medium containing the sample obtained in its best corrosion resistance , while not adding rare earth worst single rare earth somewhere in between. Appropriate frequency ultrasound can play a role in the performance of the anodic oxide film , the frequency should not exceed 20kHz . Add the electrolysis of rare earth salt crystals ceric sulfate Ce ( SO 4 < / sub > ) 2 < / sub > .4 H 2 < / sub > O ( the concentration to 0.5 g / L ) fluid , the ultrasonic wave ( frequency less than about 20KHz ) can improve the performance of the oxide film , but the frequency increases will reduce its performance . The film composition was measured and found that the presence of rare earth elements : the oxide film is not found , only play the role of a similar catalyst by using electron microprobe spectroscopy Combination instrument . The article also by SEM analysis of the morphology of the oxide film structure .