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Sulphuric acid corrosion of ultrafine-grained mild steel processed by equal-channel angular pressing |
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| Affiliation: | 1. College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China;2. Nano-structural Materials Center, Nanjing University of Science and Technology, Nanjing 210094, PR China;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, P.R. China;2. P.O. Box542, Northwestern Polytechnical University, Xi’an, 710072, P.R. China;1. NTNU, Department of Materials Science and Engineering, Trondheim, Norway;2. UIO, Department of Physics, Oslo, Norway |
| Abstract: | A bulk ultrafine-grained (UFG) mild steel with a ferrite grain size of approximately 200 nm and a dispersed distribution of iron carbide particles was fabricated by equal-channel angular pressing (ECAP) at 400 °C. The corrosion behaviour of the ECAP-processed mild steel and pure iron was investigated in a 0.5 mol/L H2SO4 solution. They exhibited a higher corrosion rate and better anodic passivity properties due to the presence of more crystalline defects. As a result of the refinement of the iron carbide particles, the forming ability of a continuous dense passive film was improved. |
| Keywords: | A. Mild steel A. Iron B. Polarization B. TEM C. Acid corrosion C. Passivity |
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