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本文对Fe2Al5涂层在液态Zn中的侵蚀相变过程进行了研究,实验结果表明:在侵蚀初期,靠界面张力平衡的作用,先发生热侵蚀,在试样表面形成热蚀沟,当热蚀沟达到一定程度后,液Zn与Fe2Al5相由不浸润变为浸润;同时Zn原子扩散进入Fe2Al5相并形成Fe2Al5-Znx固溶体相(η相);随着侵蚀时间的增加,发生在腐蚀界面上的液Zn对Fe2Al5涂层的侵蚀过程是恒温相变过程,相变过程使Fe2Al5涂层发生定向熔化.相变的驱动力来自于相成分的改变所引起的各相自由能的变化及各相间的相平衡的重新建立.
In this paper, the erosional phase transition process of Fe2Al5 coating in liquid Zn was studied. The experimental results show that in the early stage of the erosion, thermal erosion occurs first and then the surface of the sample forms a thermal erosion ditch, When the ditch reaches a certain level, the liquid Zn and Fe2Al5 phases do not infiltrate and infiltrate. At the same time, the Zn atoms diffuse into the Fe2Al5 phase and form the Fe2Al5-Znx solid solution phase (η phase). At the erosion interface, The erosive process of liquid Zn on Fe2Al5 coating is the process of constant temperature transformation, and the phase transformation process causes the Fe2Al5 coating to orientally melt. The driving force of liquid phase transformation comes from the change of free energy of each phase caused by the change of phase composition, Re-establish phase balance.