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#Brainstorming on carbon steel - preventing corrosion - surface preservation

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Hanslinger

Hanslinger

Materials
Joined
Jun 9, 2019
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3
Location
CH
To all Experts [glasses], please…
I'd like to harvest your experience - knowledge [wink] therefore I need your input on the following:

carbon steel (simple C45 / 1045) needs to be stored and delivered, without forming any rust/visual defects:

my own thought:
-) Increase in surface quality, maybe etching (finish with low roughness, cleaned of residuals)
-) High degree of purity within the steel, right heat treatment condition (…if possible, segregations/precipitations down)
-) Chlorides down (avoiding contact with road salt, dust…)
-) Low humidity storage (relative humidity <60%, low Temp …corrosion rate down)
-) Packaging under low relative humidity / low Temp (maybe with additional VCI)

…my battleplan. I'd like to exclude oiling or coating for now (saving costs)
The main issue is optics: Even if the functionality is not affected, no customer wants rust stains.

Please give me your ideas, thoughts or links to older posts/summaries [thumbsup2]
…hopefully this post can become a collection for everyone with similar challenges [tiphat]
Thank You!
 
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Will these items be packaged?
While it is true if you keep the atmosphere dry enough you will not get serious rust it is almost impossible to prevent some surface 'blushing'.
This is why people often use Vapor Phase Corrosion Inhibitors.
The volatile chemicals leave a microscopic surface film that will resist rusting.
These really only work in enclosed spaces.

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P.E. Metallurgy, Plymouth Tube
 
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Hello EdStainless, Thanks for your Input!
Material will be packaged, ...and while I'm reading your post: also enclosed and with additional VCI [smile]
...are there more dimensions to it / any ones that I didn't mention?
 
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Of the four fundamental corrosion control methodologies, the only one which applies with your prerequisites is changing the environment. You offer to do this in the last bullet point.

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.
 
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You do have to be careful with VCI. If the part is later to be welded, painted, or get some other surface treatment you will want to be cautious about the residue that the VCI leaves and how it will need to be cleaned later. There are many variations of VCI so ask around.

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P.E. Metallurgy, Plymouth Tube
 
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again, many thanks [tiphat]

"the four fundamental corrosion control methodologies"

is it:
changing material (other alloy, like**), environment (surrounding medium, VCI... no Dew), treated surface (oil, painted...phosphating) & lower temperature
(& active protection** with battery (here not possible))
??

...VCI I will talk to our contact person about residuals;

thanks, other aspect?
(I don't want to forget anything ;-)
 
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The four fundamentals are:
1. Change the material
2. Change the environment
3. Apply a coating
4. Apply cathodic protection

Like I said, 1, 3, and 4 are out given the stipulated requirements.

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.
 
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2. Is possible, if the parts are valuable. Jet engines get stored in casks with pure nitrogen purge on them.

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P.E. Metallurgy, Plymouth Tube
 
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