CORROSION OF METALLIC MATERIALS IN SULPHURIC ACID AT HIGH TEMPERATURES
A materials selection for sulphuric acid concentration or vaporization plants was made. The present work deals with the possibility of application of anodic protection techniques to some alloys that previous researches indicated as passive in 50 to 96% boiling sulphuric acid solutions. Experiments of galvanic coupling between the considered alloys and noble metals have been performed in order to determine the possibility of rising the mixed potential up to the passivity potential of the alloys, but the results indicated that this technique is only applicable in the presence of more diluted sulphuric acid solutions. Iron specimens silicon coated by various physico-chemical techniques have been also tested in order to produce coated materials able to give satisfactory corrosion resistance to boiling concentrated sulphuric acid solutions. The electrochemical behaviours of some specimens resulted very similar to the one displayed by the high silicon cast irons, that demonstrated, during previous work, the best performances in the considered environment.
Bibliographic Reference: EUR 9501 IT (1984) MF, 82 P., BFR 120, BLOW-UP COPY BFR 410, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989123104300 / Last updated on: 1987-01-01
Available languages: it