Influence of Alloy Grain Size on High Temperature Corrosion Behavior of 2.25 Cr-1 Mo Steel in SO2 + O2 Atmosphere
-
D. Ghosh
and
S. K. Mitra
Abstract
The investigation was primarily aimed to study the influence of grain size on high temperature corrosion behavior of 2.25 Cr-1 Mo steel in SO2 + O2 (ratio 2:1) environment. The various grain sizes (18 µm, 26 µm, 48 µm, and 72 µm) were obtained by different annealing treatment. Isothermal corrosion studies were carried out in different grain size specimens at 923 K for 8 hours. The corrosion film growth rate and the reaction kinetics were studied by weight gain method. The external scales of the post corroded specimen were characterized in Scanning Electron Microscope (SEM), Energy dispersive Spectroscopy (EDS) and X-Ray Diffraction analysis (XRD). Finally, it is concluded that the corrosion rate of 2.25 Cr-1 Mo steel strongly depends on grain sizes of the specimens. The corrosion rate increases with the decreases in grain size. The finer grains (18 µm) show higher corrosion rate than the coarse grains (72 µm). The reaction kinetics follows the parabolic growth rate. The scale analysis of finer grain size specimen (18 µm) shows the thicker scale and extensive scale cracking and spallations, whereas the coarse grain specimen (72 µm) shows adherent and compact scale without any scale cracking and spallations. The mechanism of the corrosion has been explained on the basis of scale characterizations in SEM, EDS and XRD for different grain sizes.
©[2012] by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- High Temperature Tensile Properties of Equal Channel Angular Pressed Al-Zn-Mg-Cu Alloy
- Hard Finish Turning Parameters Optimization for Machining of High Temperature Stainless Steel
- High Cycle Fatigue and Cyclic Plastic Deformation Behaviour of High Temperature Oxidation Resistant Titanium Aluminide Coated IMI 834 Alloy at 873 K
- Microstructural and Mechanical Properties of Er2O3-ZrO2 Ceramics with Different Er2O3 Contents
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- Hot Corrosion of Fe-Cr Alloys with 75 Na2SO4 + 25 NaCl Coating at 1173 K
- A Simple Method for Synthesis of PbS Nanoparticles Using 2-Mercaptoethanol as the Capping Agent
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