Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Cathodic protection in an acidic environment

Status
Not open for further replies.

PhilBW

Mechanical
Joined
Feb 17, 2004
Messages
112
Location
US
We have a situation where we are using a rotating screw to move an abrasive slurry through our process. Because of the abrasiveness, the material of the screw and housing is 440C stainless steel, heat treated to a Rockwell C of around 50. Now our process people have begun to add lactic acid to the process, causing pretty severe corrosion of the 440C parts. Will a sacrificial anode help in a situation like this? The temperature is around 300° F. Would hydrogen embrittlement be a concern?
 
Hydrogen embrittlement is always a concern with CP. In this case, you have a martensitic stainless steel with extremely high hardness, meaning that HE is exceedingly likely.
 
Sounds like an ideal application for abrasion resistant ceramic tiles provided there is an adhesive that withstands the process conditions.Such tiles are used on mineral processing centrifuges as in potash industryand coal industry.
Regards
Corrosionman
 
Thank you both for your replies. I had considered a ceramic material as well. I'll explore that further.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top