Henry Boyd
Well-Known Member
- Apr 24, 2007
- 6,014
- Boat Info
- ‘09 Sabre 38 Hardtop Express “Serenity”
- Engines
- Volvo D6 w/IPS450 Pods
MM has the basic science down. The point is that water immersion reduces the corrosion rate (once corrosion has started) because the amount of soluble oxygen is limited in comparison to a damp moist environment. Using an corrosion inhibiting anti-freeze reduces it farther. For practical examples; consider cast iron radiators and boilers used for hot water systems (steam boilers and radiators are a different story). Closer to our interests mooring ground tackle is always left in the water year round because it lasts longer than allowing it to sit out in the air during the off season.
There is one exception in that Corrosion inhibiting/resistant steels (Corten, Domex WR/, Dolcol Wr, Riverten-R etc.) will not perform as well as non-resistant steels when immersed in water because of they way they chemically handle corrosion. Likewise, non passivated stainless steel will show signs of corrosion when left immersed in water.
Henry
There is one exception in that Corrosion inhibiting/resistant steels (Corten, Domex WR/, Dolcol Wr, Riverten-R etc.) will not perform as well as non-resistant steels when immersed in water because of they way they chemically handle corrosion. Likewise, non passivated stainless steel will show signs of corrosion when left immersed in water.
Henry