- #1
peachy
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okay, I'm having an argument at home, we're all 2nd year engineers and have different views on the galvanizing process.
the way i see it is metals are dipped in zinc (anode) and are connected to the metal (cathode). a reaction takes place which provides cathodic protection to the metal if the galvanized coating happens to become chipped or scratched because the zinc is more electronegative than the steel.
the other two got taught (or understand from the teaching) that cathodic protection only takes place with an electic current running through the metals. as far as they're concerned galvanizing only protects steel by covering it, much like painting, to cathodically protect it you need to have the metals connected to a dc power source
any clear opinions/knowledge?? i would appreciate some proof of either theory too if possible
thanks
the way i see it is metals are dipped in zinc (anode) and are connected to the metal (cathode). a reaction takes place which provides cathodic protection to the metal if the galvanized coating happens to become chipped or scratched because the zinc is more electronegative than the steel.
the other two got taught (or understand from the teaching) that cathodic protection only takes place with an electic current running through the metals. as far as they're concerned galvanizing only protects steel by covering it, much like painting, to cathodically protect it you need to have the metals connected to a dc power source
any clear opinions/knowledge?? i would appreciate some proof of either theory too if possible
thanks