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Letter 29633
Stains on stainless steel mirror finish
surface
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Sir,
We are in the business of Tensile Membrane structures and use the
steel and stainless stuctures as supporting members for our tent
structures.
In the one of the tents in Egypt where we have used some stainless
steel 316L mirror finish materials like plates and bolts, it started
to have stains and red spots within one month of the installation
period. Please advise reason for this behavior of mirror finish
stainless steel and what is the procedure to prevent the formations
of these stsins and red spots.
Regards,
S. A Raheem
Engineering - Abu Dhabi, United Arab Emirates
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There could be a number of reasons for this. When you say "mirror
finish" 316L do you mean that it was electropolished? If so, you
should not get this unless you are exposing it to chlorides or salt
spray. If it is not electropolished it could be because it was not
passivated properly and there was free iron on the surface. It could
also be caused by inclusions in the steel which are rusting.
Dear Reader, please --
- Answer or follow-up on this subject (in non-commercial
fashion).
-
- Post a new
question or inquiry on a different subject.
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