Electroplating (Cambridge O Level Chemistry)

• Electroplating is a process where the surface of one metal is coated with a layer of a different metal
• The anode is made from the pure metal you want to coat your object with
• The cathode is the object to be electroplated
• The electrolyte is an aqueous solution of a soluble salt of the pure metal at the anode
  
  
• Example: coating a strip of iron metal with tin:

A piece of iron being electroplated with tin. The electrolyte is tin(II) chloride, a water-soluble salt of tin

• At the anode: Tin atoms lose electrons to form tin ions in solution
• At the cathode: Tin ions gain electrons to form tin atoms which deposit on the strip of iron metal, coating it with a layer of tin

Uses of electroplating

• Electroplating is done to make metals more resistant to corrosion or damage
  • e.g, chromium and nickel plating
• It is also done to improve the appearance of metals,
  • e.g. coating cutlery and jewellery with silver