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Letter 7023
Passivation time limits for pre-bond
treatment
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We have recently come across a requirement for pre-bond treatment
of Stainless Steels. This involves Passivation, Degreasing and the
Priming. The parts are supplied to us already in the passivated
condition.
My question is do we need to re-passivate prior to degreasing or
will this passivated state remain unaltered during storage? Can we
just head straight for the degreasing stage?
Ciaron Murphy
- Great Britain
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Ciaron: If the parts are relatively new, have not been mishandled
and have not been exposed to a lot of adverse conditions (rain, etc.)
the passivated surface should still be in the condition that you
received them. If they are austenitic stainless, for sure they should
be good.
Inspect the parts, especially welds if there are any. If there is
rust or other corrosion on them, they need to be repassivated. If
not, they are fine, assuming that the original passivation was good.
Feel free to contact us if you have further questions. Lee
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