Question

How electroplating with nickel can prevent iron from rusting?

Answer 1

Part-1 Electroplating

Electroplating is a process by which metal ions migrate via a solution from a positive electrode to a negative electrode.

• In this process, an electric current is passed through the solution that causes the coating of the object at the cathode by the metal in the solution,
• Electroplating of Iron$\left(\mathrm{Fe}\right)$ is done to prevent its rusting,
• For this purpose mainly Nickel is used.
• Because Nickel provides superior ductility, corrosion resistance, and hardness to the iron.

Part-2 Nickel electroplating prevents iron from rusting

• First, Nickel sulfate $\left({\mathrm{NiSO}}_4\right)$ electrolytic solution will be dissociated into${\mathrm{Ni}}^{2+}$ ions and ${{\mathrm{SO}}_4}^{2-}$ with water${\mathrm{H}}^{+}$ and ${\mathrm{OH}}^{-}$
• Then the ${\mathrm{Ni}}^{2+}$ ion will be deposited on the cathode of iron as, $\mathrm{Ni}$
• It acts as a sacrificial barrier that slows and even prevents corrosion.
• The Nickel coating on the iron will ward off corrosion in a specific environment.
• It provides the best corrosion protection in an alkaline environment