Abstract
The dissolution behaviour of Cr-substituted (0–20 at.%) hematites and magnetites is reported with relevance to the removal of corrosion product(s) deposits on iron-based alloys by way of chemical dissolution. The dissolution was carried out using synthetically prepared oxides in V(II) formulations, namely V(II)-picolinate and V(II)-citrate at 353±5 K. The dissolution rate coefficients were determined using a general kinetic equation applicable for polydispersed samples. A comparison has been drawn with the dissolution behaviour reported using organic acid-based formulation, i.e., citric acid–EDTA–ascorbic acid (CEA) mixture. The V(II) formulations are found to be more efficient than CEA. The reductive action of Fe(II)-picolinate or Fe(II)-citrate was not observed even with simple iron oxides such as α-Fe 2O 3 or Fe 3O 4. The oxidative pre-treatment of the oxides using reagents such as alkaline permanganate (AP), nitric permanganate (NP) and HMnO 4 improved the dissolution and HMnO 4 was found to be marginally advantageous.
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