Tribological performance of PEO-WC nanocomposite coating on Mg Alloys deposited by Plasma Electrolytic Oxidation

AZ31B Mg alloy specimens were coated by PEO technique in WC nano-powder containing phosphate based electrolyte under constant current densities. Wear rate and COF diagrams were plotted in order to investigation of WC nano-particles presence and it was found that nano-particle presence can decrease w...

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Bibliographic Details
Published in:Tribology international 2016-06, Vol.98, p.253-260
Main Authors: NasiriVatan, Hadi, Ebrahimi-Kahrizsangi, Reza, Asgarani, Masoud Kasiri
Format: Article
Language:English
Subjects:
AZ31B Mg Alloys
Carbides
Coating
Cross sections
Magnesium base alloys
Nano-composite coating
Nanocomposites
Nanostructure
PEO
Porosity
Tribology
Wear
Wear rate
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Summary:AZ31B Mg alloy specimens were coated by PEO technique in WC nano-powder containing phosphate based electrolyte under constant current densities. Wear rate and COF diagrams were plotted in order to investigation of WC nano-particles presence and it was found that nano-particle presence can decrease wear rate and COF significantly down to 77% and 55%, respectively. Cross sectional imaging showed that coating thickness increase with coating time and in case of nano-particle containing coatings become more compact but thickness decreases slightly. Investigation of surface morphology indicated that in presence of nano-powder, porosity as well as mean diameter of pores decreased, but prolonging coating time even in presence of nano-powder, led to mean diameter of pores reached up to 8.34µm. Presence of nano-powders, also increased hardness of coatings considerably. •PEO-WC nanocomposite coating was synthesized on Mg Alloys by Plasma Electrolytic Oxidation.•We study the effect of WC nanoparticles and the time of coating on surface characterization and wear resistance of PEO-WC nanocomposite.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2016.02.029