SS 304L resistence on sulfamic acid
SS 304L resistence on sulfamic acid
(OP)
Hi, could somebody tell me if 304L Stainless Steel resist the sulfamic acid. I need build a 9 cubic meter pan to receive spill of sulfamic acid. If sombody know a web site with information regarding this issue, will be appreciate.
Thanks
Miguel
Thanks
Miguel





RE: SS 304L resistence on sulfamic acid
See Cleaning and Descaling Stainless Steels: http://www.nidi.org/multimedia/technical_support/technical_literature_pdfs/9000_aisi_publications/9001.pdf
Descale and passivate welds after construction, and keep the SS clean thereafter. If carbon steel equipment is installed within the pan, isolate it from the SS using plastic pads. Thoroughly rinse after cleaning up any spills or splashes to avoid possible crevice or microbal corrosion beneath pads. Use good quality water for final rinsing, don't allow dirty water to dry within the containment pan.
Sulfamic acid is discussed as a cleaning agent in ASM Handbook Vol. 13 Corrosion, pp. 1140-1141. Sulfamic acid should not attack a 300 series SS unless it contains chloride (forms HCl) or is heated above 75oC (forms H2SO4). 304 SS is only fair-to-good when used as a sheath material for electric immersion heaters in sulfamic acid: http://www.heatersplus.com/corrosio.pdf
but this is for long term at high temperature.
Online recommendations for the use of 5-15% sulfamic acid solution for cleaning 304 SS include
http://www.suburbansurgical.com/caringss.html
http://www.shor-line.co.uk/CareandCleaning.html
Sulfamic acid is not even listed in the online corrosion resistance charts at
www.titanmf.com
http://www.coleparmer.com/techinfo/ChemComp.asp
nor found in a search at www.nidi.org
RE: SS 304L resistence on sulfamic acid
Best regards,
Dimi