Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 144, Issue 3, Pages 462-469Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2014.01.020
Keywords
Alloys; Coatings; Welding; Corrosion test
Categories
Funding
- National Natural Science Foundation of China [51071031]
- Beijing Natural Science Foundation [2102018, 2122017]
- Fundamental Research Funds for the Central Universities [211105562GK]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120003110010]
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A protective ceramic coating of about 50 gm thick on a friction stir welded (FSW) joint of AZ31B magnesium alloy was prepared by plasma electrolytic oxidation (PEO) in silicate electrolyte. Electrochemical corrosion behavior of uncoated and coated FSW joints was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The equivalent circuits of EIS plots for uncoated and coated FSW magnesium alloy were suggested. The corrosion resistance of FSW magnesium alloy depended on microstructure of the FSW joint. The heat-affected zone with severe grain growth was more susceptible to corrosion than the stir zone and base metal. The PEO coating consisted of a porous outer layer and a dense inner layer. The inner layer of PEO coating played a key role on corrosion protection of the FSW joint of magnesium alloy. Meanwhile, corrosion potential, corrosion current density and impedance at different zones of coated FSW joint were almost the same. The PEO surface treatment significantly improved the corrosion resistance of FSW joints of AZ31B magnesium alloy. (C) 2014 Elsevier B.V. All rights reserved.
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