Characterization of Cr-α-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 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.
Dongye Sun, Wen-Pei Sung and Ran Chen
X. Sun et al., "Characterization of Cr-α-Al2O3 Composite Coatings Electrodeposited from Cr(Ⅲ) Plating Bath", Applied Mechanics and Materials, Vols. 121-126, pp. 60-64, 2012