- Messages
- 2,016
- Reaction score
- 3,257
- Points
- 273
assalamu alaykom...
chemistry question:
can someone please explain for me how does a voltaic cell work and what are the differences between sacrificial protection and cathodic protection?
Thank you in advance
Voltaic cell: It changes chemical energy into electrical energy. It works by the difference between the reactivity of two metals. The more reactive metal is made the anode which is connected to the negative terminal of the volt meter. The flow of electrons in the outer circuit is from the more reactive metal to the less reactive metal which causes a current to flow.
The difference between sacrificial protection and cathodic protection is that in sacrificial protection, bars of a more reactive metal are attached to the metal to be protected and this more reactive metal corrodes, protecting the less reactive metal. But in cathodic protection, the metal to be protected is made the cathode and a more reactive metal is made the anode. Oxidation happens at the anode and the cathode stays protected.
I hope you got it