posted 02-27-2002 01:47 PM ET (US)
I have read conflicting statements on this forum concerning the use of anti-seize with stainless steel bolts when they are threaded into aluminum. Some people have said to use anti-seize or else you will never get the parts apart and other people have said don't use anti-seize because it causes a galvanic reaction that makes it impossible to remove the bolts. This has bothered me because I have always used anti-seize on my outboards and I have never had a problem.So, I contacted 2 anti-seize manufacturers and asked them whether or not anti-seize should be used where stainless steel bolts are going into aluminum castings and the whole mess is subjected to salt and fresh water. Both said that copper anti-seize is perfect for this application.
Here was my question to the manufacturers:
Is it ok to use anti-seize on stainless steel bolts that are threaded into aluminum castings on outboard motors. The assemblies are subject to salt water and fresh water.
The following are their responses:
-------------
From Peter Haig, Director at Molyslip Atlantic Ltd (enquiries@molyslip.co.uk):
In one word "YES" (although there are some particular situations where a copper-anti-seize with stainless steel can result in di-electric corrosion.
Therefore we can also offer our Aluminium/Graphite anti-seize as an
alternative. This is equally effective, but may have a more pleasing aesthetic result, as it will colour match your mountings!).
---------
From Hank Beckman, Technical Services at Permatex (440-914-3574)
The anti-seizes we make have no problems with saltwater. There is a specific one made for stainless to prevent gauling and reaction. It is called Copper Anti-seize Lubricant part number 09128.