Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Electrolysis in New Construction Finishes Design

I work for a general contractor in the state of Oregon, warranty division. In 1999 we built a shopping center in Battleground Washington.The canopies at the entries to the buildings are constructed using a painted hot dipped galvanized steel frame connected to aluminum panels and flashing for the roof. The galvanized steel is showing a lot of pitting and rust. Could this be caused by ELECTROLYSIS, because of the connecting of the two dissimilar metals? If so, Who can I contact to verify this condition and help to come up with a solution. Your help would be greatly appreciated.

H. Wayne Buck
Construction - Portland, Oregon, USA
2004

I don't think that the Aluminum could cause the galvanized steel to corrode; it should be the other way around.

I'd look into the internal corrosion starting from inside of the steel pipes which were pickled before the galvanizing and remained uncoated with zinc. You would have probably been better off not galvanizing the pipes as the pickling operation before galvanizing started off the rusting.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

2004

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: