Dear Expert,
We have received an email from our customer with pictures showing “rust” on the stainless steel (SS-316L) chambers. Can anyone please tell me what you see in these pictures from your perspective?
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Excellent photos, well done,
D Harvey
It is installed in Oil Refinery…..
Regards,
Vinod Kataria
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SS welded regions readily rust in the presence of moisture ,unless iron from welding fume deposits are immediately removed.
It is a very common issue and shows a lack of attention to post welding clean-up.
At least wire brushing is the minimum necessary application.
The rusting is the oxidation of the condensed iron on the SS weldment surface and surrounding zone.
D Harvey, PhD.
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Hi,
It could be galvanic reaction between two dissimilar materials or heat applied (welding, flame, etc.) could also cause chromium layer to oxidise and starts corroding the stainless steel. It seems like the latter. Will have to proper pickle and passivate to restore chromium layer and prevent further oxidation.
Regards,
Gerlof.
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