Abstract
Based on Ecocide hypothesis, the theories about the exfoliation of duplex scale in steam path had been elaborated. The causes which induced exfoliation of duplex scale could be divided into two types: internal and external factors. The former was the number and scale of voids existed in the inner and outer layer interface nearby, and the latter was the total stress response of scale. Furthermore, the internal and external causes by which the voids mentioned above might be affected were respectively chromium content of steel and steam conditions. In superheated steam, oxygen content bears pronounced correlation with chromate content. Superheated steam cation conductivity could serve as the characteristic index of the chromia evaporation of scale under the impact of oxygen in steam. The inner layer would continue to increase in thickness after exfoliation of outer layer, but hard to flake off then. In this case, supercritical units that had suffered thorough exfoliation would be relatively safe, without a worry about spalling for a long period of time.
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