| Corrosion behavior of high-strength spring steel for high-speed railway |
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| 作者姓名： | Gang Niu Yin-li Chen Hui-bin Wu Xuan Wang Di Tang |
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| 作者单位： | Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China |
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| 摘 要： | The corrosion resistance and evolution of corrosion products in medium-carbon high-strength spring steels were investigated in a neutral salt spray (5wt% NaCl solution). A formation model of γ-FeOOH and a transformation model describing the conversion of γ-FeOOH to α-FeOOH were constructed. The results indicated that, at the initial corrosion stage, the corrosion resistance was gradually improved with the addition of Cr; however, with the addition of alloying element V, the corrosion resistance decreased. These results were attributed mainly to the initial corrosion stage being closely related to the matrix microstructure parameters such as grain-boundary character and dislocation density. After the rust layer was formed at a later corrosion stage, the corrosion resistance was reinforced with the addition of Cr and V because Cr strongly influenced the composition, structure, and morphology of the corrosion products. The results presented herein show that Cr was conducive to the transformation of γ-FeOOH into α-FeOOH. Moreover, V and Cr exhibited obvious synergy and were enriched in the inner layer of the corrosion products.
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| 关 键 词： | high-strength spring steel corrosion resistance alloying elements rust layers evolution model |
Corrosion behavior of high-strength spring steel for high-speed railway |
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| Gang Niu,Yin-li Chen,Hui-bin Wu,Xuan Wang,Di Tang.Corrosion behavior of high-strength spring steel for high-speed railway[J].International Journal of Minerals,Metallurgy and Materials,2018,25(5):527-535. |
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| Authors: | Gang Niu Yin-li Chen Hui-bin Wu Xuan Wang Di Tang |
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| Affiliation: | 1.Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing,China;2.Beijing Engineering Technology Research Center of Special Steel for Traffic and Energy,Beijing,China |
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| Abstract: | The corrosion resistance and evolution of corrosion products in medium-carbon high-strength spring steels were investigated in a neutral salt spray (5wt% NaCl solution). A formation model of γ-FeOOH and a transformation model describing the conversion of γ-FeOOH to α-FeOOH were constructed. The results indicated that, at the initial corrosion stage, the corrosion resistance was gradually improved with the addition of Cr; however, with the addition of alloying element V, the corrosion resistance decreased. These results were attributed mainly to the initial corrosion stage being closely related to the matrix microstructure parameters such as grain-boundary character and dislocation density. After the rust layer was formed at a later corrosion stage, the corrosion resistance was reinforced with the addition of Cr and V be-cause Cr strongly influenced the composition, structure, and morphology of the corrosion products. The results presented herein show that Cr was conducive to the transformation of γ-FeOOH into α-FeOOH. Moreover, V and Cr exhibited obvious synergy and were enriched in the inner layer of the corrosion products. |
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