Abstract
Maintenance of superheaters in coal-fired power plants can be planned if the degradation rates of the alloys in the superheaters are known. Electrochemical methods are adopted to study the corrosion behavior of TP347H at 650 oC – 750 oC in the commercial working environment. The hot corrosion process of TP347H is divided into five steps indicated by different characteristic potential noise patterns: direct oxidation, dissolution of protective scale, oxidation, sulfidation and continuous sulfidation after the decomposition of protective scale. The corrosion product is divided into two layers: an external layer mainly composed of Cr2O3 and Cr3S4 and an inner layer consisting of Fe2O3 and Fe3S4. These layers are formed independent of the experimental temperature. The outer layer at 650 oC is much denser than that at 700 oC and 750 oC. The corrosion rate shows a maximum value at 700 oC. A further increase of temperature to 750 oC lowers the corrosion rate due to the decomposition of Fe2(SO4)3 to Fe2O3. Figure 1
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
