液态锡对低活化马氏体/铁素体钢CLF-1的腐蚀行为研究

采用背散射电子扫描显微镜、电子衍射能谱和X射线衍射等分析方法，研究了浸泡在300~700℃的液态锡(Sn)中24h后的低活化马氏体/铁素体钢CLF-1的腐蚀行为。研究结果表明，在所有测试温度下液态锡对CLF-1钢表面均有不同程度的腐蚀，主要腐蚀机制为化合溶解腐蚀。铬(Cr)以单质形式溶解沉淀，液态锡与铁在CLF-1钢表面反应生成由铁锡化合物构成的腐蚀层。当温度低于500℃时，腐蚀层厚度近似为一常量，约8μm，化学成分为FeSn₂。当温度高于500℃时，腐蚀层厚度随温度线性增加，腐蚀层呈双层结构，分别为CLF-1边界处的FeSn层和覆盖在其表面的FeSn₂层。

Corrosion of low activation ferritic/martensitic steel CLF-1 in liquid tin

Corrosion behavior of the reduced activation ferritic/martensitic steel CLF-1 was investigated in liquid tin at temperatures of 300 up to 700℃ for 24 hours with backscattered scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. Attack of liquid tin to the surface of CLF-1 was observed at all temperatures, the main corrosion mechanism was compound dissolution corrosion. Cr was considered to be dissolved and precipitated, and a corrosion layer of Fe stannate was formed at the surface of CLF-1 by reaction between Sn and Fe. Up to 500℃ the chemical composition of the corrosion layer was FeSn₂, and the thickness of the corrosion layer is a constant of about 8μm. Above 500℃ the chemical composition of the corrosion layer changed to FeSn at the border to CLF-1, forming a two-layer structure of the FeSn layer and the outer FeSn₂ layer. The thickness of the corrosion layer increased linearly with the increased temperature.