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How will Sulfamic Acid affect Stainless Steel, Ductile Iron and Carbon Graphite?

Q. We have been asked to design a rotary union that will have Sulfamic Acid pass through it for 1 day. Our customer is attempting to clean the inside of a large roll. The current material of our rotary union are Stainless steel and ductile iron. The seals are made of Carbon Graphite or silicon carbide. Based on this information do you think these materials would hold up for 1 day?

Bob Tuesley
- Three Rivers, Michigan, USA
December 12, 2011

In short, run everything is compatible; however, there will probably be some galvanic current that may allow the sulfamic acid to dissolve some iron and nickel. Also, sulfamic acid in water solution has a pH so low that it begins breaking down into sulfuric acid and ammonia [on eBay or Amazon] - galvanic problem still there.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

December 14, 2011

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