Free corrosion studies were made of Ferrovac E in 75 and 105% phosphoric acid in the temperature range 25 to 125 C (77 to 257 F). Corrosion rates and rate constants were derived for each experimental temperature; the energy of activation for free corrosion is 14 kcal/mole in 75% H3PO4 and 11 kcal/mole in 105% H3PO4. Annealing followed by electropolishing decreased the rate of corrosion of cold worked specimens in 75% H3PO4.

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© 1970 National Association of Corrosion Engineers
1970
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