𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A Contribution to the Acid Cleaning of Boilers

✍ Scribed by G. Trabanelli; F. Zucchi; A. Frignani; M. Zucchini; V. Regis; G. Rocchini


Publisher
John Wiley and Sons
Year
1979
Tongue
German
Weight
723 KB
Volume
30
Category
Article
ISSN
0947-5117

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✦ Synopsis


Abstract

The dissolution rates of various types of magnetites are measured by a spectrophotometric technique allowing the determination of Fe^3+^/Fe^2+^ 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 of 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 of magnetite and on the monitoring of the acid cleaning treatment.


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