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The dissolution rates o f various types of magnetites are measured by a spectrophotometric technique allowing the determination of Fe3+ /Fez+ ratio as a function of time. Some tests are also performed on magnetite electrodes galvanically coupled to steel electrodes.The influence of copper on the dissolution rate of magnetite is evaluated and the effect due to the presence o f organic corrosion inhibitors is determined.A circulating loop operating with some boiler tube electrodes was assembled in order to verify the possibility of monitoring the acid cleaning treatment by electrochemical measurements.Electrode potential-time curves, polarization curves and polarization resistance data are recorded; the calculated corrosion rates are compared to weight-loss data obtained in the same experimental conditions. From the overall results some conclusions are reached both on the dissolution process o f magnetite and on the monitoring of the acid cleaning treatment.

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