Abstract
The influence of adding 3% Mo on the restoration of the intergranular corrosion resistance of a pure ferritic steel with 17% Cr was investigated on specimens quenched from 1050°C and aged at 700°C (from 5 min to 15 h). The tests were conducted in two standard oxidizing reagents currently employed for intergranular corrosion studies (Streicher and Huey tests). Whereas the sensitivity to grain boundary corrosion of a steel without molybdenum decreases in both reagents with the holding time at 700°C, the grain boundary corrosion of a 3% Mo steel, on the contrary, increases progressively. The behaviour of the steel without molybdenum is well accounted for by the theory of chromium depletion wereas that of the steel with 3% Mo can be explained by the increased rate of electrochemical dissolution of chromium carbides in which part of the chromium is replaced by molybdenum. This interpretation then gives a new significance to the Streicher test.
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