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| Corrosion Behavior of a New Low Alloy Steel Q415NH |
| CHENG Xuequn1, TIAN Yuwan1, YIN Yuqun2, WANG Jun2, ZHOU Cheng1, LI Xiaogang1 |
| 1. Corrosion and Protection Centre, University of Science and Technology Beijing, Beijing 100083, China;2. Research Institute of Nanjing Iron and Steel Company, Nanjing 210035, China |
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Abstract: The corrosion behavior of a new low alloy steel Q415NH is investigated by its exposure to alternate conditions of 12min immersion in a mixed NaCl and NaHSO3 solution and 48min drying at 45℃ to provide a basis for developing new weathering steels and studying the effects of alloy elements on the corrosion resistance under high Cl- atmospheric conditions. The results suggest that the corrosion resistance of Q415NH is much better than Q420, and the anticorrosion mechanism can be summarized into the following three aspects: (1) Due to the addition of 3%Ni, Q415NH have a microstructure of large number of fine bainites dispersed on ferrite; (2) The addition of Ni can increase the potential of the steel and the resistance of rusts to improve the anodic passivation; (3) The rusts of Q415NH are much more protective by the formation of a compact and fine structure with the anodic ion-selection.
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Received: 11 April 2013
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2013, Vol. 31 
