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Home > Forums > Engineering Forums by Industry > Steel Engineering > Steel and Stainless engineering Forum

passivation of SS sheet

Read More Threads Like This One

livehho (Electrical) (OP)

17 Sep 08 11:18

Hi all,

You normally use nitric acid or citric acid to passivate stainless steel. BUT, I was told that you can also use Vinegar.

Is this true? If so, how it's done?

Thanks a lot

EdStainless (Materials)

17 Sep 08 13:15

Check in ASTM A967 for passivation methods.

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Plymouth Tube

livehho (Electrical) (OP)

17 Sep 08 13:25

I already have..

but thx anyway

EdStainless (Materials)

17 Sep 08 14:38

If it isn't listed there then it doesn't meet the official requirements.  Not that it might not work, but you would taking the risk.
There are many options listed.  Why wouldn't you use one of them?
You need to use an oxidizing acidic solution to passivate.  You are trying to dissolve free iron from the surface.  Assisting formation of a uniform and robust chrome oxide passive surface film is a secondary issue.  I could do that with hydrogen peroxide, but it wouldn't remove any iron.

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Plymouth Tube

strider6 (Materials)

18 Sep 08 4:10

i don't think that it will works... to passivate a stainless steel you need an oxydant. Passivation means that you passivate, form an oxyde on the surface, an this is why is used a nitric acid that is a strong oxydant. With vinegar you can clean the steel but not passivate..
this is my opinion..

http://www.corrosionist.com/cleaning_stainless_steel.htm

s

Corrosion Prevention & Corrosion Control

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