Subject: Are acids or bases more corrosive

I am asking this question for my son and myself.  I was attending
a biology class, my first, and one of the topics were biological 
functions begin with chemistry. One subject covered basic and acidic 
conditions. I have been in the habit of reviewing my notes with my 
son, trying to generate some interest from him.  This was one subject 
that caught his attention.  He is doing his project on this process.  
This is what we have developed so far.  

3 or 4 nails,  of stainless, zinc coated, galvinized, and plain iron

containers of acidic solution (lemon juice), basic solution 
(clorox),and neutral (H20)

(secondary question)  Will results be significantly affected if we 
place more than 1 type of nail in a container?

We have found it most difficult to locate material that explains the 
process' at a 6th grade level or laymens terms without going into 
ionic distribution and buffers (which dad doesn't know about enough to 
explain).  Could you please help us.

Fred R. Guerrero (dad)
and Rafael L. Guerrero (student)

Thanks

Note:  We have already accessed your answer to:
DOES RUSTING OF IRON COMMONLY INVOLVE BACTERIA? (23 Jan 97)
and ALLOY OXIDATION (23 Jan 97)

Re: Are acids or bases more corrosive