ABSTRACT

In this study, the isothermal and cyclic corrosion behaviours of Haynes 282 and Haynes 214 in a lithium molten salt were investigated at 650°C for 168 h and 7 thermal cycles, respectively; this was achieved by measuring the mass changes, surface and cross-sectional morphologies with their elemental distributions, and compositional changes in the subscale, substrate and spalled oxide scale. The weight loss of Haynes 282 comprising an external corrosion layer was approximately four times lower than that of Haynes 214 with a spalled external corrosion layer, depending on the effects of their alloying elements and the preservation, spallation and dissolution of the corrosion layer. After 168 h and 7 thermal cycles, corrosion products of Haynes 282 were Cr₂O₃ and CoCr₂O₄ and those of Haynes 214 were Cr₂O₃, LiFeO₂ and FeCr₂O₄. In addition, the internal corrosion layers of Haynes 282 and Haynes 214 exhibited localised and uniform corrosion behaviours, respectively.

摘要

本研究分别研究了Haynes 282和Haynes 214在锂熔盐中的等温腐蚀行为和循环腐蚀行为，分别在650°C 168 h和7个热循环；这是通过测量质量变化、表面和横截面形态及其元素分布，以及亚尺度、基材和剥落氧化皮的成分变化来实现的。包含外部腐蚀层的 Haynes 282 的重量损失大约是具有剥落外部腐蚀层的 Haynes 214 的四倍，这取决于其合金元素的影响以及腐蚀层的保存、剥落和溶解。经过 168 h 和 7 次热循环后，Haynes 282 的腐蚀产物为 Cr ₂ O ₃和 CoCr ₂O ₄和Haynes 214的那些是Cr ₂ O ₃、LiFeO ₂和FeCr ₂ O ₄。此外，Haynes 282 和 Haynes 214 的内部腐蚀层分别表现出局部和均匀的腐蚀行为。