期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 19, 期 3, 页码 592-600出版社
ELSEVIER
DOI: 10.1016/S1003-6326(08)60318-0
关键词
aluminum alloy; conversion coating; rare-earth element
资金
- Scientific and Technological Plan of Guangdong Province, China [20071300031800003]
- Development Foundation of Science and Technology of Foshan City, China [2005040153]
- South China University of Technology, China [20080203]
In order to accelerate the conversion coating formation on 6063 Al alloy in the Ce(NO3)(3) solution, accelerants of chloride and ammonium salt were used. The coating morphology, composition and structure were analyzed with SEM/EDS, EPMA, XPS and XRD. The coating morphology is influenced by the composition, pH value and temperature of the treating solution. The coating composed of metal oxide, metal hydroxide and hydrate appears to be amorphous. The elements in the coating are Al, Ce, O, Mn and Mg, while the Ce element exists in the forms of Ce3+ and Ce4+. The accelerant of chloride call increase the compactness and Cc content of the coating, so the coating corrosion resistance is remarkably improved. A scheme for the electrochemical reaction in the coating formation was proposed, and the potential change in the coating fort-nation was also studied. It is found that chloride can shorten the time period of the first and the second stages in coating formation.
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