INFLUENCE OF PH ON THE DISSOLUTION KINETICS OF IRON IN SULFURIC-ACID-SOLUTIONS

Authors
Citation
M. Vukovic, INFLUENCE OF PH ON THE DISSOLUTION KINETICS OF IRON IN SULFURIC-ACID-SOLUTIONS, Hydrometallurgy, 43(1-3), 1996, pp. 79-93
Citations number
37
Categorie Soggetti
Metallurgy & Metallurigical Engineering
Journal title
ISSN journal
0304386X
Volume
43
Issue
1-3
Year of publication
1996
Pages
79 - 93
Database
ISI
SICI code
0304-386X(1996)43:1-3<79:IOPOTD>2.0.ZU;2-E
Abstract
The effect of pH on the kinetics and mechanism of Armco iron (99.99%) corrosion in deaerated, nitrogen saturated solutions at 21 degrees C w as studied. The total concentration of sulphate ions in the solutions tested was 0.5 M. The increase in the pH in the range tested caused a change in the Tafel anodic straight line slope from 28 mV dec(-1) (pH 0.6) to 75 mV dec(-1) (pH 4.15), without a change in the anodic mechan ism. For the anodic dissolution the order of reaction with respect to the OH- ion was found to be -1. The effect of pH on the corrosion pote ntial and current was also found.