SS-316L Rusting

[Vinod Kataria]

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?

 

 

[Karthik]

It might be due to poor cleaning/pickling process or no pickling and or improper picking/curing time

Thanks& Regards,

 

(Karthik)

Karthikeyan.S

M: +66-892512282
E-mail : karth...@yahoo.com

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[gulzar ali]

What type fluid service? 

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[d...@btinternet.com]

Excellent photos, well done,

D Harvey

[Vinod Kataria]

It is installed in Oil Refinery…..

 

Regards,

Vinod Kataria

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[d...@btinternet.com]

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.

[sachit yadav]

Appears to be fluid marks due to contamination or possibly poor pickling done.

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[Gerlof Oegema]

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.

 

 

 

DISCLAIMER

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[Ananthanarayanan Mohan]

dear sir,

The rust is seen mostly along the weldments. This can be due to improper cleaning as stated in one of the views. This can be attributed to the wire brush. Normally passivation with diluted HNO3 is done. If this is not done correctly this type of problems can occur. Thanks

Mohan Ananthanarayanan

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[Adnan B.BELGACEM]

Dear Expert,

Please could you advise about the root causes and how we can repair and stop this rust that occurred after the degreasing of the SS 304L tank? 

Regards

ABB

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[Jamie Reyes]

Did this material/fabrication receive chemical treatments such as, but not limited to, pickle and passivate treatment? If so, do you know what test method was used to prove conformance to specification? Do you have the inspection report from the pickling and passivation, if performed? Depending where you are located, ASTM A967 is an industry standard specification for such treatments that shall be followed, or its equivalence.   

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Regards,

Jamie Reyes

J.R. Machine Company, Inc.

[Adnan B.BELGACEM]

Dear Jamie;

Yes, the passive treatment meets the requirement of the ASTM and vendor instruction for application steps, we need to know the main reason for these faults could be due to the below reason which under investigation:

1- Vendor product used is expired (Under verification with supplier)

2- Water used was contaminated (checked and found acceptable)

3- Environment condition such as sunlight (maybe is not the main reason)

4- Other

So for this case, we need to repeat the passive application or we should follow another applicable procedure to remove this rust and to avoid the recurrence. 

regards

Adnan

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[Vipul Makwana]

After degreasing any surface treatment required, otherwise after  approx 24 hours rusting of material starting,

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[Jamie Reyes]

Your issue has signs pointing to iron contamination. Iron contamination on the surface of the stainless steel will oxidize and begin the degradation processes on the contamination itself then upon the surface lattice of the metal. Effective passivation requires proper cleaning of the stainless steel followed by the removal of all free iron contamination from the surface. Our natural environment makes it so that the iron rusts immediately upon contact with air and or water. Once this happens, only a passivation treatment will stop the contamination and reverse the exposure. What I believe you need to focus on is the iron oxide removal process by means of either Phosphoric Acid or Acetic Acid treatment. I referred you to ASTM A967 on my previous email but am now recommending ASTM A380. Cannot stress enough how much cleanliness is needed for such situations. Hope it all works out for you. 

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[George Dilintas]

Could be caused by iron contamination 

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis