A Study on the Oxidation Behavior of Nickel Coatings with Different Grain Sizes and Preferred Orientations

Abstract:

Ni coatings with different grain sizes and preferred orientations were produced by the control of current density during a direct current electrodepositing process. The effects of grain size reduction and preferred orientation on the oxidation behavior in air at 600°C and 960°C of Ni coatings were investigated respectively. An important and interesting result is that after oxidation at 600°C, the Ni coating obtained at lower current density has a better oxidation resistance, whereas after oxidation at 960°C, the Ni coating obtained at higher current density has a more compact scale and a better oxidation resistance. For the Ni coatings oxidation at 600°C, the oxidation behavior was mainly influenced by grain size, whereas in the case of the Ni coatings oxidation at 960°C, the oxidation behavior was only slightly influenced by grain size. The changes in oxidation behavior of Ni coatings at 960°C can be attributed to the different preferred orientation and the corresponding oxidation mechanism.

• Periodical: Advanced Materials Research (Volumes 183-185)
• Pages: 1762-1766
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.183-185.1762
• Online since: January 2011
• Authors: Li Ma, Ke Chao Zhou, Lei Zhang, Zhi You Li
• Keywords: Electro-Deposition, Grain Size, Nickel Coating, Oxidation, Preferred Orientation

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