3.4 Flashcards
Reasons for electroplating objects
2
Prevention of corrosion
Decoration
Example of object electroplated to prevent corrosion
Water taps
jewellery
cutlery
decorative items
What is electroplating
The application of a metal coating to a metallic or conducting surface by electrolysis
What does electroplating involve?
The movement of charged particles in an electrolyte
What is the cathode? What charge?
Object being electroplated
Negative
What is the anode?
What is it’s charge?
Bar of pure metal
Positive
the cathode is immersed in an aqueous solution containing what?
ions of the required metal
what happens during electrolysis
metal is deposited on the article as metal from the anode goes into the solution
what is an ion?
charged because it is an atom that has lost or gained an electron
M^n+ne- ——-> M
M—> M^n+ + ne-
why is nickel jewellery electroplated with precious metals
prevention of corrosion
decoration
