How to protect stainless steel processing equipment
from acid attack...
α suggestion based on experience in pickling steel cartridge cases
H E R E is a suggestion that may help sub stantially to prolong the life of your hardto-replace, stainless steel e q u i p m e n t . . . in processes where such equipment is exposed to acid attack . . . and where the additions of small amounts of ferric sulfate to the materials being processed could be tolerated.
Producers of steel cartridge cases have found that 1% to 3% Ferrisul (anhydrous ferric sulfate) in their 5% to 10% sulfuric acid pickling solutions acts as a passivating agent on their stainless steel pickling equip ment, much of it originally designed for handling copper cases. As a result, the stain less steel is protected from sulfuric acid attack, yet the acid remains effective against annealing scale on the cases themselves.
Ferrisul is widely used as a mild oxidizing
agent in many metal finishing processes, as a highly efficient coagulant in the treatment of water and sewage and in various organic reactions. It contains a minimum of 90% soluble ferric sulfate with a maximum of approximately 5% insoluble. If the insoluble is undesirable, however, it can be removed with comparative ease. A dry, granular powder, Ferrisul is easy to store, handle and use, is readily soluble in water and is now available in ample quantity. If there is a possibility that Ferrisul may help you prolong the useful life of your stainless steel equipment, write today for samples and details. Monsanto's technical service men will be glad to help if you wish. MONSANTO CHEMICAL COMPANY, Merrimac Division, Everett Station, Boston 49, Massachusetts.
(ANHYDROUS FERRIC SULFATE) S T A N D A R D FORM: Pellets 4 - 4 0 mesh
MONSANTO CHEMICALS
COLOR: Pale, reddish brown TYPICAL ANALYSIS: 9 0 % min. Fe2(SO 4 )3 APPARENT DENSITY: 7 0 lbs. to CU. ft.
SERVING INDUSTRY . . W H I C H SERVES MANKIND
ANGLE OF SLIP: 3 4 ° HEAT O F S O L U T I O N : 2 6 0
BTU
to
lb.
of
Ferrisul
