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Ted Mooney, P.E. RET
Pine Beach, NJ

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Chrome conversion coating to stop galling?

Would a chrome conversion coating on aluminium help prevent galling/cold welding between an aluminium thread and mild steel? We are in the construction industry and have approximately 18 000 large parts so commercial anti-seize compounds are not practical. The threads are tightened, left under load and then loosened about 3 weeks later. Grease makes a small difference but is not solving the problem.

Andrew Farrow
consulting - Johanessburg, South Africa
2006

If grease does not help, I think that your aluminum threads are distorting under the load rather than galling.

James Watts
- Navarre, Florida
2006

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