Corrosion mechanism of ZTAp-Fe material used in coal transportation equipment
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摘要: 井下环境差，由传统钢铁材料制造的井下煤炭输运装备的使用寿命较低。本文通过电化学试验、扫描电镜观察、能谱分析等方法，探究了粉末冶金法制备增强铁基复合材料(ZTAp-Fe)的耐腐蚀性能、微观组织结构以及元素分布之间的规律，揭示了ZTAp-Fe材料的耐腐蚀机理。结果表明，ZTAp-Fe材料中ZTAp与铁基体结合状态良好，界面为非冶金结合。铁基合金中引入20 % ZTAp，腐蚀速率由0.909 28 mm/a降至0.365 14 mm/a，电荷转移电阻(Rct)由775.6 Ω·cm2提高到1 025.3 Ω·cm2。ZTAp的耐蚀性优于铁基体，界面处形成腐蚀产物有效抑制腐蚀介质对ZTAp和铁基体的进一步腐蚀。ZTAp增强铁基复合材料能够有效地提高煤炭输运装备的使用寿命。Abstract: Due to the harsh underground environment, underground coal transportation equipment made of traditional steel materials has a relatively low service life. Through electrochemical test, scanning electron microscope observation, energy spectrum analysis and other tests, the law of corrosion resistance, microstructure and element distribution of ZTAp reinforced iron matrix composites prepared by powder metallurgy is explored, the corrosion resistance mechanism of ZTAp-Fe material is revealed. The results show that ZTAp and the iron matrix are in good bonding state in the ZTAp-Fe materials, and the interface is non-metallurgical bonding. With the introduction of 20 % ZTAp in the iron matrix alloy, the corrosion rate decreased from 0.909 28 mm/a to 0.365 14 mm/a, and the resistance of charge transfer (Rct)increases from 775.6 Ω·cm2 to 1025.3 Ω·cm2. The corrosion resistance of ZTAp is better than that of iron matrix. The formation of corrosion products at the interface effectively inhibits the corrosive medium from further corroding the interface between ZTAp and the iron matrix. ZTAp reinforced iron matrix composites can effectively increase the service life of coal transportation equipment.
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Key words:
- composite /
- electrochemistry /
- corrosion mechanism /
- powder metallurgy /
- interface
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图 2 ZTAp-Fe复合材料制备流程
Figure 2. Preparation process of ZTAp reinforced iron matrix composite
图 4 ZTAp-Fe材料的EDS线扫描结果
Figure 4. Result of EDS line scan of ZTAp reinforced iron matrix composite
图 6 Fe45基体和体积分数为20 % ZTAp增强铁基复合材料的阻抗谱和等效电路
Rs—溶液电阻;Rct—电荷转移电阻; CPE—界面电容相关的常相位角元件
Figure 6. Impedance spectra and equivalent circuit of Fe45 matrix and Fe matrix composite reinforced with 20 % ZTAp
表 1 铁基自熔合金的化学成分
Table 1. Chemical composition of iron-based self-fluxing alloys
成分 Fe C Cr Ni Si B 质量分数/% 79.2 0.098 15.5 0.065 0.57 1.33 
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表 2 铁基合金和ZTAp-Fe材料表面的阻抗拟合结果
Table 2. The impedance fitting results of the iron-based alloy and ZTAp reinforced composite surface
样品 Rs/
(Ω·cm2)CPE Rct/
(Ω·cm2)Y0 /
(sn·Ω-1·cm-1)n 铁基合金 1.6 2.87×10-5 0.797 7 775.6 ZTAp增强
复合材料1.8 1.09×10-5 0.896 5 1 025.3
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表 3 EDS表面扫描分析各元素含量
Table 3. EDS surface scan analysis of the content of each elemen
元素 质量分数/% 原子百分比/% O 20.39 42.00 Al 22.20 27.11 Cr 8.42 5.34 Fe 34.31 20.24 Zr 14.68 5.31 总量 100.00
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