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exhaust rust prevention
Posted by Sjer (more from Sjer) on Sun, 9 Sep 2007 07:27:40
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BobS posted a question a long time ago about preventing rust on the welds where flanges arre attached to the exhaust pipe.
The high rate of corrosion is caused by galvanic corrosion, which results from the use of dissimilar (from pipe material) weld filler metal. The corrosion is worsened by water that collects on the bottom of the pipe, especially when the car is only driven on short trips.
The best preventative step you can take is to seal the welds on the inside with a coating of epoxy (JB Weld or similar). Let the epoxy fully cure before installing the exhaust pipe. Epoxy is impervious to water and the coating should help to reduce galvanic corrosion.
posted by 12.75.17...
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