Adding external zinc
- Thread starter gettinthere
- Start date
Sure there is great Consensus that they don't school, but STRAY all over the marina.
Jim...
I have a drop Zinc shaped like a fish.
Just kidding.
The drop Zinc electrons flow all over, but are used faster by the paths of least resistances and greatest potentials [Noble series].
Bronze seacocks have low potential. I have tested mine with a AgCl reference probe and show -459 mVolts where my Bronze Prop/SS shaft combo shows -950 mVolt, so the prop gets most electron flow.
Jim...
Just kidding.
The drop Zinc electrons flow all over, but are used faster by the paths of least resistances and greatest potentials [Noble series].
Bronze seacocks have low potential. I have tested mine with a AgCl reference probe and show -459 mVolts where my Bronze Prop/SS shaft combo shows -950 mVolt, so the prop gets most electron flow.
Jim...
I have tested my Fish shaped Drop Zinc and the shaft Zinc with a AgCl reference probe.
There is a very noticeable change [improvement] in Potential with both in the water.
Both with and without the Drop Zinc were acceptable protection.
You might think of it, as the surface area of what you are trying to protect.
Example: Your bronze propeller has, lets say, 2 square feet of surface to corrode.
The electron flow is from Zinc to Prop instead of Prop to Shaft. We want the Zinc to provide the galvanic battery a flow of electrons, not the Bronze prop.
If your prop Zinc has 4 sq inches and your Drop Zinc 40 sq inch, but 4 feet away, both Zincs will provide protection.
It is a matter of discharge RATE from each. Not either or, but both.
Yes, the drop Zinc will reduce the Prop Zinc RATE of sacrifice. How much?
Jim...
PS: The steel hulls in USNavy has so much surface area that a Zinc would not work.
There is a very noticeable change [improvement] in Potential with both in the water.
Both with and without the Drop Zinc were acceptable protection.
You might think of it, as the surface area of what you are trying to protect.
Example: Your bronze propeller has, lets say, 2 square feet of surface to corrode.
The electron flow is from Zinc to Prop instead of Prop to Shaft. We want the Zinc to provide the galvanic battery a flow of electrons, not the Bronze prop.
If your prop Zinc has 4 sq inches and your Drop Zinc 40 sq inch, but 4 feet away, both Zincs will provide protection.
It is a matter of discharge RATE from each. Not either or, but both.
Yes, the drop Zinc will reduce the Prop Zinc RATE of sacrifice. How much?
Jim...
PS: The steel hulls in USNavy has so much surface area that a Zinc would not work.