The Continuous Plating of Ni-Cr Composite Coatings and TiO2 Nano-Modify

Abstract:

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Ni-Cr films were electrodeposited from a nickel sulfate, chromium chloride and chromium sulfate bath. To avoid the poor adhesion and bad surface morphology of the secondary-co-deposition of Ni-Cr alloy films, H2O and DMF (volume ratio as 1:1) is used as solvent. Along with the alloy films growing thick, their surface apertures become larger correspondingly, which causes the hardness and corrosion resistance of the films becoming poor. For comparison, nanocrystalline Ni-Cr films with TiO2 nanoparticles were obtained on the same condition. TiO2 nanoparticles have an average size of 40 nm. The corrosion resistance of the Ni-Cr composite coatings were comparatively evaluated by salt spray test. It is found that the incorporation of TiO2 particles enhances the microhardness and corrosion resistance of the coatings. The reason is that the nano-TiO2 particles in the deposit effectively reduce the size of Ni and Cr crystals through grain refinement-strengthening and dispersion-strengthening effect. The observation results of scanning electron microscopy (SEM) indicated that the Ni-Cr films without dispersions of TiO2 nanoparticles exhibited numerous large and deep crackles, however, the crackles of nano-TiO2 Ni-Cr film distinctly became less.

Info:

Periodical:

Advanced Materials Research (Volumes 239-242)

Edited by:

Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He

Pages:

227-231

DOI:

10.4028/www.scientific.net/AMR.239-242.227

Citation:

D. X. Du et al., "The Continuous Plating of Ni-Cr Composite Coatings and TiO2 Nano-Modify", Advanced Materials Research, Vols. 239-242, pp. 227-231, 2011

Online since:

May 2011

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Price:

$35.00

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