Abstract
The scaling rate of iron is not influenced by water vapor at 750°C. At 850 °C the rate rises by the factor 1·2 and at 950°C by the factor 1·6 respectively. Carbon dioxide produces a smaller increase than water vapor. Inert markers will be found at the iron/wustite interface after oxidation in dry oxygen at 950°C. After short-time oxidation in mixtures of oxygen and water vapor or oxygen and carbon dioxide the markers will be found also at the iron/wustite interface, but after longer times they migrate into the wustite. At the same time the wustite layer becomes very porous. To explain the results, it is supposed that pores occur at the iron/wustite interface during the oxidation. In the presence of water vapor or carbon dioxide a H 2/H 2O or CO/CO 2 mixture, respectively, is formed in these pores, which transports by an oxidation/reduction mechanism oxygen to the iron surface. Therefore oxide bridges are built up from the metal to the scale, which enables the further oxidation of the metal without substantial inhibition.
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.
