Influence of Average Current Density and Pulse Frequency on Morphology and Structure of Pulse-reverse Current Electroplated Ni Plating

Wang, Zekun; Long, Xiaoping; Wu, Yunwen; Li, Ming

doi:10.1109/icept50128.2020.9203000

Cited by 1 publication

(2 citation statements)

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“…However, the cobalt element content remarkably affects the grain refinement of nickel-cobalt alloy coating, directly impacting its surface morphology. If the cobalt content reaches a relatively high value, the grain refinement effect will wear off, and the grain size will become larger [1] . As observed from Figure 2, it is found that the nickel-55.5 wt.% cobalt alloy coating has a broad diffraction peak than anyone from other tested coatings.…”

Section: Surface Morphologymentioning

confidence: 99%

“…Generally, as-plated alloy coatings have more excellent surface properties than as-plated single metal coatings, including corrosion resistance, mechanical property, high-temperature oxidation resistance, and abrasion performance. Compared with pure nickel deposition, nickel-cobalt alloy deposition possesses better resistance to both corrosion and wear, which has become a sort of important engineering material in mechanical and aerospace applications [1] . Also, due to their excellent properties, the nickel-cobalt alloy coatings electrodeposited have an alternative potential to substitute electrolytic hard chromium plating, which is prepared by environmentally hazardous processes based on Cr 6+ ions [2,3] .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cobalt Content on the Properties of Nickel-Cobalt Alloy Coatings

Wang

Liu

Ding

et al. 2023

J. Phys.: Conf. Ser.

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A batch of nickel-cobalt alloy coatings was pulse-electroplated on gun steel (PCrNi3MoVA) surface, in which weight fractions of Co element are 39.9 %, 55.5 %, 67.5 %, and 79.8 %, respectively. The formations of phase and crystal structure in nickel-cobalt coatings were investigated by X-ray diffraction analysis. The layers’ surface morphology and chemical composition were analyzed by scanning electron microscopy coupled with energy dispersive spectrometry. The tribological and nano-mechanical performances of the coatings were used to evaluate by high-speed reciprocating friction and wear tester and nanoindentation tester, respectively. The results showed that the preferred orientation of the coatings gradually changed from (111) to (220) with the rising cobalt content, resulting in changes in the surface morphology of the coatings from pyramidal grains to spherical particles and then to a triangular pyramid structure. As the Co content was 55.5 wt.% in the nickel-cobalt coating, its crystalline grain size reached the smallest value of 11.53 nm, enhancing the hardness and wear resistance.

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Section: Surface Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%