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CBSE Class 12-science Answered

pls explain electroplating 
Asked by Rohit7korhale | 28 Jun, 2019, 02:52: PM
answered-by-expert Expert Answer
Electroplating is the process of coating a metal with a thin layer of another metal by electrolysis to improve the metal’s resistance to corrosion.
Iron articles are electroplated with copper, chromium, tin or nickel for decorative purposes in jewellery, and for the durability of cutlery and motor parts. 
 
Articles made of iron are electroplated to make them shine and to prevent iron from getting rusted.
Example: Chromium plating is done on many objects such as car parts, bathroom taps, kitchen gas burners, bicycle handlebars and wheel rims.
 
  • In electroplating, a metal salt solution is taken in a container. 
  • The salt of the metal which is to be coated over another metal is chosen.
  • The metal to be coated is dipped in the solution and connected to the negative pole.
  • The metal desired for coating is connected to the positive pole (anode).
  • When an electric current is passed through the solution, the metal from the anode is dissolved in the salt solution and deposited over the negative pole (cathode).
  • Thus, a coating of the desired metal is obtained on another metal.

Answered by Varsha | 28 Jun, 2019, 04:58: PM
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