How to remove ferrous contamination on Stainless Steel
How to remove ferrous contamination on Stainless Steel
(OP)
Dear gents,
I'm working as an Anti-corrosion coating engineer, and I'm writting a Painting Specification.
We may have some stainless steel to protect with a two coats painting system (High build epoxy 2*200µm).
In order to properly apply this sytem we shall blast cleaned the surface with non-ferrous abrasive material (garnet, aluminium oxide...)
And before any paint application we have to be 100% sure that we don't have any ferrous contamination on the surface. We are using test to reveal any ferrous contamination (As per ASTM A380 §7.3.4)
My question is the following, as far as I understand the "prussian blue solution" (Distilled water, Nitric acid, Potassium ferricyanide) is only revealing the contamination, but I can't find any information on how to remove this contamination.
Is this solution is also able to remove the ferrous contamination ? If yes, what would be the procedure ?
Do you have any reference of cleaning kit from vendor ?
Cheers,
M.D
I'm working as an Anti-corrosion coating engineer, and I'm writting a Painting Specification.
We may have some stainless steel to protect with a two coats painting system (High build epoxy 2*200µm).
In order to properly apply this sytem we shall blast cleaned the surface with non-ferrous abrasive material (garnet, aluminium oxide...)
And before any paint application we have to be 100% sure that we don't have any ferrous contamination on the surface. We are using test to reveal any ferrous contamination (As per ASTM A380 §7.3.4)
My question is the following, as far as I understand the "prussian blue solution" (Distilled water, Nitric acid, Potassium ferricyanide) is only revealing the contamination, but I can't find any information on how to remove this contamination.
Is this solution is also able to remove the ferrous contamination ? If yes, what would be the procedure ?
Do you have any reference of cleaning kit from vendor ?
Cheers,
M.D





RE: How to remove ferrous contamination on Stainless Steel
ASTM A967 has some basic solutions that are proven for this application.
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Plymouth Tube
RE: How to remove ferrous contamination on Stainless Steel
RE: How to remove ferrous contamination on Stainless Steel
http://citrisurf.com/wave.htm
That's not an endorsement of their particular solution, it's just the first link I found in a Google search on the topic.
RE: How to remove ferrous contamination on Stainless Steel
Letting the metal sit 72 hours in air will do more to build a passive corrosion resistant layer than any chemical treatment.
But for that to happen the surface needs to be clean.
Nitric acid is the traditional chemical used. Citric works, if it has some additives in it. It takes longer, but it is also much easier to work with.
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Plymouth Tube