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316 and 304 pH value that passive films braks?
- Thread starter aligali
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EdStainless
Materials
In what environment? Cl, Fl, S compounds, temperature and so on.
There are curves in papers by Effird that give temp, pH, Cl limits.
For example: 100ppm Cl, 110F, pH=7 or 10ppmCl, 40F, pH=5
You have to make sure that you are talking the correct steel chemistry also. The older corrosion work on 316 was almost all done with steel that had roughly mid-range chemistry. That product no longer exists. People used to commonly use 316 in cooling water with 500ppm Cl, today anything over 200ppm is pushing your luck.
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Plymouth Tube
There are curves in papers by Effird that give temp, pH, Cl limits.
For example: 100ppm Cl, 110F, pH=7 or 10ppmCl, 40F, pH=5
You have to make sure that you are talking the correct steel chemistry also. The older corrosion work on 316 was almost all done with steel that had roughly mid-range chemistry. That product no longer exists. People used to commonly use 316 in cooling water with 500ppm Cl, today anything over 200ppm is pushing your luck.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
as Ed said you should at least define the environments (seawater, water, acid...) then is possible to give you a reply..
S
Corrosion Prevention & Corrosion Control
S
Corrosion Prevention & Corrosion Control
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