Subject: Steel corrosion process in salt Water

Dear Scientists:
I would like to know the basic chemical process thats happens to steel when it 
stays emersed in salt water. 
I am a diver working in the East River of NY City and currentlly inspecting 
steel sheet piling ( unprotected by a coating ). I have observed numerous holes 
in the sheeting and would like to know
chemically why this is happening. I do understand that electrons are being 
exchanged but perhaps you can expound on this.
Thank you for your time it is most appreciated.
Sincerly,
Michael Gray

Re: Steel corrosion process in salt Water