Be very careful in using galvanic potential chart.

1.	The relative potential can change depending on the environment.  The 
most popular chart is based on metals immersed in salt water, which may not 
be the same as your application condition,

2.	The galvanic series shows the "thermodynamic" difference, it has no 
information on the "kinetics" of corrosion.  It indicates there may be a 
corrosion problem, it does not tell how bad corrosion will be.  If the 
potential difference is large, care must be taken, or test must be 
performed.

Kuan-Shaur Lei, Ph.D.
Senior Member of Technical Staff
Advanced Technology Department
Compaq Computer Corporation
[log in to unmask]
(281) 518-8099  (phone)

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