How much of EMF change after aluminum is anodized (chromated) depends on how good/thick the coating is. It is fairly easy to measure the relative potential delta of two materials. Check the book "Corrosion Engineering" by Fontana/Greene or any other electrochemistry book and you'll know how to do it. Remember, (1) surface area is an important factor, (2) Redox (reduction/oxidation) potential is only a thermodynamic indicator, i.e., the tendency to corrode. It does not provide kinetic information, i.e., how fast it corrodes. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************