A method to obtain zinc / nickel alloy coating by applying direct current for high corrosion resistance in water-free solutions
A direct current power supply in a water-free ionic-based deep eutectic solvent enables efficient production of a gamma phase Ni2Znn coating with high hardness and corrosion resistance, addressing the limitations of existing zinc-nickel plating methods.
Patent Information
- Application Number
- PCT/TR2024/050217
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-07
- Publication Date
- 2025-08-07
AI Technical Summary
Current electrochemical zinc-nickel plating methods in aqueous solutions are costly, toxic, and difficult to control, leading to hydrogen embrittlement and rapid evaporation, while alternative methods like physical vapor deposition are expensive and limited to small-scale applications, necessitating a safer, more efficient, and cost-effective method for producing zinc-nickel alloys with high corrosion resistance.
A method using a direct current power supply in a water-free ionic-based deep eutectic solvent (DES) containing choline chloride and ethylene glycol to electrochemically deposit a Ni2Znn phase with 14-18% nickel uniformly dispersed in zinc, achieving a 28 pm thick coating in 180 minutes with high efficiency and hardness.
The method produces a gamma phase Ni2Znn coating that is five times harder than cadmium, offers superior corrosion resistance, and meets international safety standards, with a coating efficiency of 91.1% and corrosion resistance verified by TAFEL and electrochemical impedance spectroscopy.