Sulfamic acid cleaning of Hastelloy C-2000?
Sulfamic acid cleaning of Hastelloy C-2000?
(OP)
Does anyone have experience with using sulfamic acid to clean C-2000 equipment?
I've found literature for C-276 in 10% sulfamic (0.002 mils/yr) but nothing for C-2000. My main concerns stems from the Copper in C-2000. Our contractor acid cleaners use sulfamic but have a note in their documents: "Sulfamic acid is not an acceptable solvent for use in systems whose materials of construction include copper or copper alloys, because of the possibility of stress corrosion cracking.". Haynes shows C-2000 composition at 1.6%wt Cu. Any concerns with cleaning a C-2000 vessel with sulfamic? Or any recommendations on literature that would help me understand the SCC concerns specific to the copper? Thanks
I've found literature for C-276 in 10% sulfamic (0.002 mils/yr) but nothing for C-2000. My main concerns stems from the Copper in C-2000. Our contractor acid cleaners use sulfamic but have a note in their documents: "Sulfamic acid is not an acceptable solvent for use in systems whose materials of construction include copper or copper alloys, because of the possibility of stress corrosion cracking.". Haynes shows C-2000 composition at 1.6%wt Cu. Any concerns with cleaning a C-2000 vessel with sulfamic? Or any recommendations on literature that would help me understand the SCC concerns specific to the copper? Thanks





RE: Sulfamic acid cleaning of Hastelloy C-2000?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: Sulfamic acid cleaning of Hastelloy C-2000?
"Copper is a substitutional atom for the Nickel so it’s part of the crystal matrix and not present as a precipitate or secondary phase. If anything, I would expect the C-2000 to be slightly more resistant to Sulfamic than C-276."
RE: Sulfamic acid cleaning of Hastelloy C-2000?
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"