Question

How do we do do electro plating on the iron rods on bridges because they are so big ❓

Answer 1

Have you ever looked at some gold jewellery in a shop and thought, 'That's cheap!'? If so, the chances are that it has been electroplated. It won't be pure gold. It will have a thin layer of the precious metal coating a much cheaper metal underneath.

Electroplating is the coating of a metal object with a thin layer of another metal during electrolysis.

Objects are electroplated to make them attractive or to protect them against corrosion.

Electroplating in the laboratory

We can investigate

electroplating using nickel as the plating metal.

The object we want to plate is made the

cathode in an

electrolysis experiment. The

anode is made of nickel and the

electrolyte is a solution of a nickel salt.

Look at the circuit in Fig.1 below:

Figure 1. Nickel electroplating in action.

Which metal is being plated in the experiment?

Nickel

Copper

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At the cathode:

The nickel ions in solution plate the cathode.

Ni2+(aq) + 2e− Ni(s)

In this experiment, the nickel anode gets involved in the electrolysis. The electrode doesn't just carry electrons back to the battery. It loses mass in the experiment as nickel atoms enter the solution as nickel ions.

So at the anode:

Ni(s) − 2e− Ni2+(aq)

As a nickel

ion is removed from solution at the cathode, a nickel ion enters the solution from the anode.

Answer 2

because not to rust and and the rod is rusted the bridge cannot hold maximum cars and the bridge falls.
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