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Surface characterization of growth process for cerium conversion coating on magnesium alloy and its anticorrosion mechanism
Author(s) -
Lei Li,
Wang Xin,
Tang Qunwei,
Chen Shougang,
Zhu Zhibin,
Xu Luomin
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5570
Subject(s) - cerium , conversion coating , coating , magnesium alloy , materials science , cerium oxide , chemical engineering , magnesium , dielectric spectroscopy , corrosion , cerium nitrate , x ray photoelectron spectroscopy , alloy , electrochemistry , agglomerate , oxide , inorganic chemistry , metallurgy , chemistry , nanotechnology , composite material , electrode , engineering
Cerium conversion coating is successfully deposited on magnesium alloy AZ31 for corrosion protection. Deposition time on the influence of cerium conversion coating morphology, composition, and electrochemical properties has been investigated in detail. Morphological observation reveals that the cerium conversion coating is a porous agglomerate nanostructure. XPS indicates that the coating exhibits a time‐dependent ingredient. Moreover, the coating is considered as a combination of magnesium oxide/hydroxide and cerium (III) and (IV) oxides/hydroxides. The results of electrochemical impedance spectroscopy indicate that the anticorrosion coating exhibits the best properties during deposition of 5 min. In view of the analysis, the anticorrosion mechanism is pioneered proposed because of the formation of H‐bonding layer, which forms a reasonable barrier to Cl − ions. Copyright © 2014 John Wiley & Sons, Ltd.