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some thoughts on the corrosion problem
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Posted by Wade Taylor [Email] (more from Wade Taylor) on Mon, 22 Jul 2002 17:05:22 Share Post by Email
In Reply to: New document on 2.1L Block Repair ...at, SAABTECH [Profile/Gallery] , Mon, 22 Jul 2002 00:28:22
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very nice write up1.

i often wonder if the newer gaskets (copper) are causing some of these problems. this combination of metals (steel, copper, aluminum) would make my metallury teacher have a stroke when talking about corrosion. You have a perfect set up for electrolytic corrosion from having these 3 dissimilar metals in contact with each other. the antifreeze provides the electrolyte and the motor provides some nice heat changes to accelerate the process. you now have 4 dissimilar metals within this area with the brazing rod materials. of course if the gasket doesn't get weak it wouldn't allow the electrolyte to get inbetween the metals to start the current either so may be a moot point.

on your repair attempt sounds like a winner. it will be interesting to follow up on to find if the HAZ (heat affected zone) around the repair will show accelerated corrosion or any other problems.

i thought JB Weld or similar was the preferred method of correcting this problem. it would have several advantages over the brazing method. a) no further introduction of dissimilar metals into the mix, b)no extreme localized heat which can/does/will change the grain structure of the base metal and c)anybody can do it which is the really positive stroke on the JB weld method. i have used it to repair saab transmissions that have had holes punched in them with great success.

posted by 64.33.20...
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