Nano Archive

The effect of surface morphology on pitting corrosion resistance of Ni nanocrystalline coatings

Zamanzad-Ghavidel, M. R. and Raeissi, K and Saatchi, A (2009) The effect of surface morphology on pitting corrosion resistance of Ni nanocrystalline coatings. Materials Letters, 63 (21). 1807 - 1809.

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Official URL: http://www.sciencedirect.com/science/article/B6TX9...

Abstract

In this study, pitting corrosion resistance of nano and microcrystalline Ni coatings was evaluated based on polarization diagrams and pit morphology observations. Two copper substrates with higher {400} and {111} peak intensity were used. In the case of direct current deposition, a mixed morphology consisting of pyramids and blocks appeared on both copper substrates, but a spherical morphology was detected in the case of pulse current deposition. Breakdown potential of the nanocrystalline coatings was higher than that of microcrystalline coating. In the case of nanocrystalline deposits, coating with higher grain size showed higher resistance to pitting corrosion, which is in contrary to the results reported by others. The morphology of corroded surface revealed that the pits were confined on the pyramids and therefore the blocky morphology was responsible for higher resistance to pitting corrosion.

Item Type:Article
Uncontrolled Keywords:Ni nanocrystalline; Electrodeposition; Corrosion; Pitting corrosion; Morphology
Subjects:Material Science > Nanostructured materials
ID Code:6573
Deposited By:SPI
Deposited On:10 Feb 2010 17:30
Last Modified:10 Feb 2010 17:30

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