Nickel-Plated Anode Bars
Q: We operate acid chloride zinc baths. We always have the anode bars nickel plated prior to installation or replacement. I know this is a dumb question, but why must they be nickel plated? D. L.
A: First of all, there is never a dumb question! It is my experience that what’s dumb is not asking the question. Chloride zinc baths are very corrosive and will attack copper-based materials. If your anode bars are made of copper, they will corrode very rapidly. Nickel is resistant to attack by the bath and is routinely used with this type of zinc plating.
Another important point is, if you have a bare copper anode bar and you clean it on a regular basis, copper will be washed into the zinc bath. Copper is a serious contaminant for this type of bath. Nickel, on the other hand, is less harmful to the bath.