Corrosion rate of carbon & stainless steel in 10% HCl
Corrosion rate of carbon & stainless steel in 10% HCl
(OP)
I am looking for general corrosion rate data (mm/year or mils/year) for Type 304 stainless steel and a basic carbon steel that would qualify as a grade 5 fastener under SAE J 429, i.e. medium carbon steel (0.28 to 0.55% carbon content). The temperature range of interest is ambient to 200 F. The ASM HANDBOOKS do not have actual numbers that I could find, just statements like "Stainless steels are generally not used for HCl service". Got any numbers for me mcguire-
?
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RE: Corrosion rate of carbon & stainless steel in 10% HCl
RE: Corrosion rate of carbon & stainless steel in 10% HCl
These rates are so unsatisfactory that differentiation is not too interesting to researchers.
An interesting point is that when the elements like chromium that make an alloy passive cannot form a stable oxide ( or hydroxide ) then they actually increase the corrosion rate. That's why stainless must be designed to be assuredly passive in the environment in which it's used.
HCl is used to pickle carbon steel. It goes after it rapidly. It would be for stainless but the attack is too uneven, making for a rough, pitted surface.
I have a nice Powerpoint short course on stainless corrosion which I would like to post on a website, but I don't know how to do that. Anyone want to help?
RE: Corrosion rate of carbon & stainless steel in 10% HCl
RE: Corrosion rate of carbon & stainless steel in 10% HCl
TVP, by the way, the above data comes from the Stainless Steel Handbook by Peckner and Bernstein. It's from the 1970's and is out of print, unfortunately. The data quoted was from a section written by Avesta who still ahve the best corrosion R&D lab.
RE: Corrosion rate of carbon & stainless steel in 10% HCl
RE: Corrosion rate of carbon & stainless steel in 10% HCl
RE: Corrosion rate of carbon & stainless steel in 10% HCl
I found some more data in Sedrik's "corrosion of stainless steel".In 20C 10%HCl 304 and 316 have weight loss rates of 50 g/sq.mm./day. Carbon steel's is more than 100 times greater. Apparently, stainless is partially passive under these conditions. The rates should converge as passivity is lost.
RE: Corrosion rate of carbon & stainless steel in 10% HCl
I would be interested in the Powerpoint presentation also. We are currently battling stainless steel corrosion and stress cracking on our extrusion cooling systems. The RO water source was accidentally contaminated with a cloride containing mixture.
thanks
RE: Corrosion rate of carbon & stainless steel in 10% HCl