镍元素对高耐候钢大气腐蚀行为的影响

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Effect of Element Ni on Atmospheric Corrosion Behavior of High-strength Weathering Steel

1. Key Laboratory of Ministry of Education of P. R. C. for Ecological Metallurgy of Polymetallic Paragenetic Ore, Northeastern University, Shenyang 110819, Liaoning, China;
2. Ansteel Group Co., Ltd., Anshan 114014, Liaoning, China

摘要: 针对铁路高强耐候钢的特点，通过调整钢中的镍含量，研究了试验钢耐大气腐蚀的变化规律，结果表明：在低铬和低镍条件下，试验钢表面基体与内锈层之间存在裂纹现象，随着钢中镍含量的增加，表面锈层厚度呈减薄的趋势，且致密性增加；在曝晒初期试验钢表面锈层结构以γ-FeOOH为主；随着曝晒时间的延长，表面锈层产物组成中不仅含有γ-FeOOH相，而且还出现了α-FeOOH相；而且随着镍含量的升高，试验钢表面锈层中α-FeOOH和γ-FeOOH比值逐渐增大。
- 铁路用钢 /
- 耐候钢 /
- 大气腐蚀 /
- 镍 /
- 锈层结构
Abstract: According to characteristics of high-strength weathering steel for railway use,variation of resistance to atmospheric corrosion of the steel was studied by adjusting the content of nickel. The results reveal that with low content of nickel and chromium,there are cracks existing between the base metal and the inner rusty scale. As the content of nickel rises,the rusty scale becomes thinner and more compact. At the initial stage of sun exposure,the rusty scale is mainly composed of γ-FeOOH,and along with the time extending,α-FeOOH gradually forms. Moreover,the higher nickel content,the higher α-FeOOH to γ-FeOOH ratio.
- steel for railway use /
- weathering steel /
- atmospheric corrosion /
- Ni /
- composition of rusty scale