The Last Stand of the web we knew & loved: no cost, no reg'n, no popups
As an Amazon Associate & eBay Partner: we earn from qualifying purchases

finishing.com -- The Home Page of the Finishing Industry

-----

Deterring corrosion on aluminum alloys (Bravo III outdrive)

April 15, 2010

Hi, Just bought a boat with a Bravo III outdrive. I read many message boards about the corrosion issues that Mercuiser has had with earlier models of this outdrive, primarily 1998 thru 2003. The outdrive itself is aluminum. The propeller is stainless steel.
I understand why dissimilar metals can cause corrosion, specifically here. But I would like to know what process is best for priming and would be best suited for this application in the outdrive as-well-as what method of cleaning the corrosion is most effective.
I read one article that zinc chromate primer (which so many mechanics use) is NOT best suited and that it can cause or allow corrosion.
Someone else suggested a process of: Cleaning process - using Alumiprep 33 ⇦ on eBay or Amazon [affil links] , then Alodine ⇦ on eBay or Amazon [affil links] . Painting - Two coats of: Epoxy Primer, Polyurethane Universal black, & then Clear coat it.
This boat will be used in fresh & salt water.

Thanks,

Dale Hill
The serious D-I-Y'er - Tupelo, Mississippi

April 21, 2010

Hi, Dale. Your second proposal sounds good to me. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

(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: