- Jul 21, 2013
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Featured Pool Chemistry, stainless steel corrosion and prevention, long term study.
- Thread starter PoolStored
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- Jun 24, 2021
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Not as far as the salt part...
Saltwater is ~30,000–40,000 µS/cm conductivity.
"Freshwater" is <1,000 µS/cm
The pool is "brackish", but on the low end...~2,000–4,000 µS/cm conductivity.
Most estuarine environments are 8-20K
So, what you're saying is that the more weight change, the more you will be impressed with the galvanic current?
The protection is based on the voltage differential.
Magnesium has a higher voltage differential, which means that it pushes electrons to the steel with more potential.
Corrosion of the steel happens when the steel loses electrons.
If the magnesium is pushing an excess of electrons into the steel, the oxidizer is reduced and the steel does not lose electrons.
- Jul 21, 2013
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In simple language then … a magnesium anode provides more protection than a zinc anode?
You said it in post #18.
- Jun 24, 2021
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- May 23, 2015
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Either would work for galvanic protection but magnesium is the better choice from a practical consideration as it dissolves more cleanly and efficiently. Zinc has a tendency to passivate with an adherent oxide/carbonate layer making it less effective.
- Jul 21, 2013
- 65,894
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
- Jul 21, 2013
- 65,894
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Why then are zinc anodes the favored use and recommendation among pool companies?
Cost?
- Jun 24, 2021
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Zinc anode production and material costs are lower per unit weight.
- Jun 24, 2021
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Ok, No more to report. Everbrite recommends a 2 week cure period before submerging.
Anode on order. I'll report in 2 weeks with first impressions and anode install.
Anode on order. I'll report in 2 weeks with first impressions and anode install.
- May 23, 2015
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- Pentair Intellichlor IC-60
- May 23, 2015
- 25,763
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Magnesium is also a much more difficult metal to process as it is extremely flammable and burns very hot. Once a magnesium fire starts, it’s difficult to put out. Zinc is far less reactive and easier to work with. Both metals present inhalation health hazards when casting or machining them.
- Jul 21, 2013
- 65,894
- Pool Size
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- Chlorine
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- Pentair Intellichlor IC-60
Zinc- lower cost, easier to work, less flammable than magnesium.
Don’t sniff either one.
Got it.
Don’t sniff either one.
Got it.
The formula:
- Salt = (CH*1.1678) + (TA*1.6859) + (Borate*2.6976)
- Sodium = 23*((TA-CYA/3)*2/100 + CYA/129 + Salt/58.4 - 2*CH/100)
- TDS = CH*(40/100) + (TA - CYA/3)*2*(61/100) + CYA*(128/129) + Borate*(61.8/10.8) + Salt*(35.5/58.4) + Sodium;