Characterization of Cr-[alpha]-Al2O3 Composite Coatings Electrodeposited from Cr(III) Plating Bath

Cr-α-Al2O3 composite coatings were prepared by direct current deposition experiments from Cr(III) plating bath and the thickness of composite coatings could be up to 14 μm. The obtained Cr-α-Al2O3 coatings and Cr coatings were characterized by means of EDS, SEM and microhardness measurement. Results...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Applied Mechanics and Materials 2011-10, Vol.121-126, p.60
Hauptverfasser: Sun, Xin, He, Xiang Zhu, Wang, Yong Xiu, Fu, Zhi Hong
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Cr-α-Al2O3 composite coatings were prepared by direct current deposition experiments from Cr(III) plating bath and the thickness of composite coatings could be up to 14 μm. The obtained Cr-α-Al2O3 coatings and Cr coatings were characterized by means of EDS, SEM and microhardness measurement. Results revealed that Cr-α-Al2O3 coatings exhibit fine-grained structure with uniform surface and the highest microhardness values(692 HV) when the α-Al2O3 content of coatings was 15g/L, although some pores and defects are still present in the coatings. Analysis of Tafel curves indicated that the presence of α-Al2O3 in the Cr coatings show better features in the corrosion resistance both in H2SO4 and NaOH solution than those prepared from the bath without α-Al2O3.
ISSN:1660-9336
1662-7482
DOI:10.4028/www.scientific.net/AMM.121-126.60