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| ELECTROCHEMICAL BEHAVIORS OF ULTRA HIGH STRENGTH STEELS WITH CORROSION PRODUCTS |
| SUN Min1), XIAO Kui1), DONG Chaofang1), LI Xiaogang2) |
1) Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083
2) Beijing Institute of Aeronautical Materials, Beijing 100095 |
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Cite this article:
SUN Min XIAO Kui DONG Chaofang LI Xiaogang. ELECTROCHEMICAL BEHAVIORS OF ULTRA HIGH STRENGTH STEELS WITH CORROSION PRODUCTS. Acta Metall Sin, 2011, 47(4): 442-448.
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Abstract The electrochemical behaviors of ultra high strength steels, 300M and AerMet 100, with corrosion products which were formed during salt spray test were studied using potentiodynamic polarization curve, EIS, SEM, scan Kelvin probe (SKP) and Raman spectroscopy. The results show that the corrosion products on the steel 300M are γ-FeOOH and Fe(OH)3, and those on the steel AerMet 100 are β-FeOOH, Fe3O4 and γ-Fe2O3 after salt spray test. Because of the compact characterization, Fe3O4 and γ-Fe2O3 have a better protection property for substrate by hindering the permeation of O2 and Cl-. The corrosion potentials shift negatively and corrosion current densities become larger with increasing salt spray time, meaning a faster rate of anodic dissolution for these two steels. After salt spray test, the values of Kelvin potential for the two steels are 0.5-0.6 V positive than those before tests, and more uneven. For 300M, the corrosion resistance of rust layer becomes larger/smaller with the corrosion productions gathering/drapping on/from the samples. The electrochemical reaction for AerMet 100 is diffusion--controlled process and the value of Warburg impedence which expresses the diffusion--hindering effect becomes larger. The corrosion resistance and protection ability of corrosion products for steel AerMet 100 are better than those of steel 300M.
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Received: 13 September 2010
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| Fund: Supported by National Science and Technology Infrastructure Platforms Construction Projects (No.2005DKA10400) and National Natural Science Foundation of China (No.51001012) |
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