Corrosion behaviour of multiwall carbon nanotube/magnesium composites in 3.5% NaCl
Corrosion behaviour of multiwall carbon nanotube/magnesium composites in 3.5% NaCl
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DOI：
10.1016/j.electacta.2011.05.082
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发表时间：
2011-08
影响因子：
6.6
通讯作者：
M. Turhan;Qianqian Li;H. Jha;R. Singer;S. Virtanen
中科院分区：
文献类型：
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作者：
M. Turhan;Qianqian Li;H. Jha;R. Singer;S. Virtanen
采用失重法、氢气收集法、pH值法以及开路电位法、极化曲线法和电化学阻抗法等电化学方法研究了熔融搅拌法制备的多壁碳纳米管（MWNT）改性纯镁（Mg）复合材料（MWNT/Mg）的腐蚀行为。结果表明，MWNT/Mg复合材料的腐蚀速率明显高于纯Mg的腐蚀速率。复合材料的腐蚀速率也取决于熔融搅拌过程中MWNTs的分散程度。MWNTs在增加腐蚀速率中的作用显然可以归因于它们的高阴极活性。腐蚀产物层的表征表明，MWNTs在基体中的分散导致腐蚀产物更均匀地覆盖表面，并且腐蚀产物层的厚度最低。在所有情况下，腐蚀产物层对表面的保护都很差。纯镁以及镁/多壁碳纳米管复合材料的腐蚀速率显着增加，在1周的浸泡，这种效果是最强的复合材料与分散的纳米管，可以归因于增加阴极动力学随时间的推移。
Corrosion behaviour of multiwall carbon nanotube (MWNT) modified pure magnesium (Mg) composites (MWNT/Mg) prepared by melt stirring technique was investigated by weight loss, H2gas collection and pH measurements, as well as electrochemical methods such as open circuit potential (OCP) monitoring, polarisation curves and electrochemical impedance spectroscopy (EIS). Results show that the corrosion rate of MWNT/Mg composites is significantly higher than the corrosion rate of pure Mg. The corrosion rate of the composites also depends on the degree of dispersion of MWNTs during melt stirring process. The role of the MWNTs in increasing the corrosion rate clearly can be attributed to their high cathodic activity. Characterization of the corrosion product layers indicates that dispersion of MWNTs in the matrix leads to a more homogeneous coverage of the surface by corrosion products, and the lowest thickness of the corrosion product layer. The corrosion product layers in all cases provide poor protection of the surface. The corrosion rate of pure Mg as well as Mg/MWNT composites significantly increases during 1-week immersion; this effect is the strongest for the composite with dispersed nanotubes and can be attributed to the increased cathodic kinetics with time.