Internal stress of high tungsten content Ni-W alloy coatings

ABSTRACT

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.

KEYWORDS:

• Electrodeposition
• Ni-W alloy
• internal stress
• carbon content
• high tungsten content
• nanocrystalline
• Amorphous materials
• Electrochemical corrosion

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [Grant Number 52174280]; Science and Technology Support Program of Jiangsu Province: [Grant Number SYG202022].