Corrosion behaviour of nanocrystalline 304 stainless steel prepared by equal channel angular pressing |
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| Authors: | Z.J. Zheng Y. Gao Y. Gui M. Zhu |
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| Affiliation: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, PR China;2. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, PR China |
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| Abstract: | Effect of microstructure change on the corrosion behaviour of equal channel angular pressed (ECAPed) 304 stainless steel (SS) was investigated. Nanostructure (80–120 nm) was obtained after 4 and 8 passes ECAP and exhibited a higher corrosion resistance than as-received SS. However, thickness and composition of the passive film formed in air at room temperature on both as-received and 8-pass samples show little difference, indicating that Cr diffusion is not enhanced by the formation of nanostructure. The improved corrosion resistance of ECAPed SS is not caused by thickness or composition change, but by compactness and stability improving of the passive film. |
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