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[MW:34435] selecting Proper storage tank material - Advise

By Materials & Welding

Dear Gents,

Kindly support selecting the proper storage tank material of Sodium Polycarboxylate.
currently, I have 100 ton CS storage tank of  Sodium Polycarboxylate the internal Stainless steel 304 cladding 2mm sheets.
After one year of operation, we found corrosion spots and  Sodium Polycarboxylate leakages.
internal SS 304 cladding welding joints by Argon welding - 7018 welding wires.
tank tested by water and it was excellent without any leakages.
The  Sodium Polycarboxylate data sheet is attached.
I've attached photos of the corrosion.

Please advise which material I should select to fabricate a storage tank for  Sodium Polycarboxylate and how to solve current corrosion spots.

thanks. 

ploy 1.jpg

poly 2.jpg
poly 4.jpg
poly 5.jpg

poly 6.jpg

0c7f1879-b709-4cb5-846d-617afb87ba3e.jpeg



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