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...
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Veröffentlicht in: | Applied Mechanics and Materials 2011-10, Vol.121-126, p.60 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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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. |
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ISSN: | 1660-9336 1662-7482 |
DOI: | 10.4028/www.scientific.net/AMM.121-126.60 |