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One-step electrochemical fabrication of bilayered MgO/polymer coating on magnesium alloy |
Jun LIANG( ),Ren-Hui ZHANG,Zhen-Jun PENG,Bai-Xing LIU |
| State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract This research demonstrates a novel one-step electrochemical method to fabricate thick bilayer coatings on magnesium alloy in acid phosphate electrolyte containing aniline monomer and styrene-acrylic emulsion (SAE) with pulsed DC voltage. The morphologies, XRD and FTIR results show that the bilayer coating consists of an inner oxide layer and an outer polyaniline (PANI)/SAE composite layer. It is believed that the bilayered structure achieved results from a hybrid process combining electropolymerization (EPM) of aniline, electrophoretic deposition (EPD) of SAE and plasma electrolyte oxidation (PEO) of magnesium alloy substrate. Electrochemical corrosion tests indicate that the bilayer coating can provide superior corrosion protection to the magnesium alloy substrate in 3.5 wt.% NaCl solution.
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| Keywords
magnesium alloy
bilayer coating
EPD
PEO
corrosion resistance
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Corresponding Author(s):
Jun LIANG
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Issue Date: 12 September 2014
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