Adhesion of electrodeposited nanocrystalline Ni–W coatings on Cu

Panagopoulos, C.; Plainakis, G.D.; Giannakopoulos, K. I.

doi:10.1080/00202967.2018.1403102

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2023

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“…As a result, researchers have focused on obtaining high-quality Ni-W alloys with high tungsten content. Some studies have shown that the hardness and corrosion resistance of the Ni-W coating increase with increasing W content [9][10][11]. However, the Ni-W alloy coating, especially Ni-W alloy with high tungsten content (W > 30 wt.%), produces large internal stress due to the process parameters, the composition of the bath, and the defects of the coating [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Internal stress of high tungsten content Ni-W alloy coatings

Xu,

Wang,

Sheng

et al. 2023

Surface Engineering

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This study investigates the impact of current density on the microstructure, composition, and internal stress of Ni-W alloys electrodeposited in a citrate system. Using XRD, SEM, EDS, TEM, and XPS, it was found that tungsten serves as a solute in a Ni-W FCC structure oriented in the (111) direction. Increasing current density led to higher tungsten content and current efficiency. The addition of 2-Butyne-1,4-diol altered the carbon content, significantly reducing internal stress by promoting carbide formation near grain boundaries, which prevented coating shrinkage during hydrogen escape. This carbon enrichment improved the alloy's corrosion resistance.

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