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Effects of Working Frequency on the Structure and Corrosion Resistance of Plasma Electrolytic Oxidation Coatings Formed on a ZK60 Mg Alloy
Author(s) -
Su Peibo,
Wu Xiaohong,
Jiang Zhaohua,
Guo Yun
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02411.x
Subject(s) - materials science , plasma electrolytic oxidation , corrosion , alloy , metallurgy , magnesium alloy , electrolyte , ceramic , substrate (aquarium) , plasma , magnesium , electrode , chemistry , physics , quantum mechanics , oceanography , geology
The effects of working frequency on the composition, morphology, and corrosion resistance of ceramic coatings formed on a ZK60 magnesium alloy by plasma electrolytic oxidation were studied in this paper. It is found that the coatings are composed of MgO only. The rise of frequency led to an increase in the number of the channels and a decrease in the discharge channel diameter. The corrosion resistance of the coated samples was improved compared with that of substrate, which became more obvious as the working frequency was increased. This could be due to the more compact structure of the alloy formed at higher frequencies.