Corrosion behaviour of Al86.0Co7.6Ce6.4glass forming alloy with different microstructures
Corrosion behaviour of Al86.0Co7.6Ce6.4glass forming alloy with different microstructures
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不同组织Al86.0Co7.6Ce6.4非晶合金的腐蚀行为
DOI：
10.1016/j.apsusc.2016.04.188
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发表时间：
2016
影响因子：
6.7
通讯作者：
McCartney D.G.
中科院分区：
文献类型：
--
作者：
Li C.L.;Wang P.;Sun S.Q.;Voisey K.T.;McCartney D.G.
Al-Tm-RE非晶合金具有优异的力学性能和耐腐蚀性，已被广泛报道。通过电化学实验和显微镜观察，研究了不同显微组织的Al86.0Co7.6Ce6.4玻璃形成合金的腐蚀行为。结果表明，显微组织对其有一定的影响。激光和电子束表面熔化过程产生的快速凝固组织与铸态合金相比具有不同程度的钝化程度。与晶态合金相比，这些表面处理产生的非晶态表面层具有更好的耐蚀性。铸态和激光处理的Al86.0Co7.6Ce6.4在Al/Al11Ce3共晶区发生局部腐蚀，而非晶态材料表现为均匀腐蚀。与AA2024和Alclad 2024的电化学行为相比，激光-电子束联合处理制备的全非晶层具有更大的负腐蚀电位、更高的点蚀电位和均匀的腐蚀机制，这表明该材料是一种潜在的AA2024保护阳极候选材料。
It has been extensively reported that Al-TM-RE amorphous alloy has excellent mechanical properties and corrosion resistance. In this paper, the corrosion behaviour of an Al86.0Co7.6Ce6.4glass forming alloy with different microstructures is investigated through electrochemical experiments and microscopy. Results show the effect of microstructure. Laser and electron beam surface melting processes produce rapidly solidified microstructures with different extents of passivation compared to the as-cast alloy. An amorphous surface layer produced by these surface treatments had superior corrosion resistance compared with the crystalline alloy. As-cast and laser treated Al86.0Co7.6Ce6.4suffered localised corrosion in the Al/Al11Ce3eutectic region whereas the amorphous material exhibited uniform corrosion. Compared with the electrochemical behaviour of AA2024 and Alclad 2024, the fully amorphous layer prepared by combined laser-electron beam treatment exhibited advantages such as the more negative corrosion potential, the higher pitting potential and the uniform corrosion mechanism, which indicates that this material is a potential anode candidate in the protection of AA2024.