corrosion protection

huangyhg

corrosion protection
this has been posted in the corrosion engineering forum also:
we have an existing steel structure that is partially submerged.  steel 's' sections have corroded near the water line by approximately 1/8" over a period of 40 years.  sufficient material remains such that strength is not an issue at this point.  we are considering the application of sacrificial zinc strips or 'hockey pucks' to minimize corrosion for the next 40 years.  is this sufficient to provide corrosion resistance and what is the farthest distance from the unprotected surface to the zinc strip is acceptable?  any other method of protection acceptable?
thanks, dik
google sacrificial anode and you should find heaps of info on this.
sounds like this is your best bet as i doubt you would be able to get full coverage from a coating.
it's an existing inlet structure gate support guide and i'm looking at getting a bit of a background on the process; my only prior exposure for cathodic protection has been using impressed currents.  i downloaded several articles and will spend the next few days reviewing the methodology.  we will retain the services of a corrosion specialist; this is for background information only.
i forgot to add that the existing structure that is not corroded has a high build epoxy type coating.
i've had a response in the corrosion engineering forum and have posted additional questions.  if you can supplement this, it would be appreciated.
thanks, dik