Fabrication of tools for micro-injection molding performed by electroforming of Ni-W alloy is proposed. Influences of complexing agents, which enable the Ni-^sW co-electrodeposition, on the process properties are critical. We optimized the complexing agents in the electrolyte for obtaining high current efficiency (>80%) and low residual stress in the deposit. The thermal stability of the Ni-W layer deposited from the new electrolyte is also investigated. Hardness of the Ni-W deposit (W=6 at. %) increased by annealing at temperatures up to 550°C. This indicates that the Ni-W material can be useful also for injection molding of polymers such as PEEK, with high glass-transition temperature. To a certain extent the Ni-W alloy could also be used as a replacement for hard chromium plating.
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