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

Deng Xue Du; Zhi Peng Zhang; Lei Zhou

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

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 239-242The Continuous Plating of Ni-Cr Composite Coatings...

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

Abstract:

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.

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Periodical:

Advanced Materials Research (Volumes 239-242)

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227-231

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.239-242.227

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Online since:

May 2011

Authors:

Deng Xue Du, Zhi Peng Zhang, Lei Zhou

Keywords:

Corrosion Resistance, Microhardness, Ni-Cr Film, Secondary-Co-Deposition, TiO₂ Nanoparticle

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