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Electrochemical potential Alodine to Nickel

What is the value of electrochemical potential between aluminium AG3 finishing with Alodine 1500 and Nickel (in fact, the contact is between Alodine and Nickel).

Please answer quickly. Thank you very much.

Jan Chwastek
- Hauts-de-Seine, France
2004

Chromate conversion coatings (Alodine 1500 in this case) are easy to break through. There is some resistance from Alodine 1500 and nickel oxidizes to increase surface resistance. However, it is most likely that contact is made directly to the aluminum. In that case the electromotive series potentials prevail.

Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics"
and "Plating ABS Plastics" eBay or AbeBooks affil links])
2004

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