GH3625合金在SO2酸性环境下的高温腐蚀行为

High temperature corrosion behavior of GH3625 alloy under acidic atmosphere SO2

摘要:

这项工作研究了GH3625合金在900 ℃的SO2酸性环境下的腐蚀行为。通过扫描电子显微镜（SEM），能量色散谱（EDS）和X射线衍射（XRD）研究了腐蚀后试样的表面形态和腐蚀产物。通过SEM，EDS和电子探针微量分析仪（EPMA）检查横截面形态，以观察样品内部的腐蚀。研究结果表明：GH3625合金在酸性气氛下的腐蚀速率随SO2含量的增加而轻微增加。合金表面形成了一层主要是Cr2O3的致密氧化膜，这层氧化层可以有效阻止SO2扩散到合金基体内部。另外，基体内部的铬能够以CrS的形式与硫元素结合，减缓腐蚀。GH3625合金在高温SO2环境中具有优异的耐腐蚀性。

Abstract:

This work investigates the corrosion behavior of GH3625 alloy under acidic atmosphere SO2 at 900 ℃. The surface morphologies of the corroded specimens and the corrosion products were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The cross-sectional morphology was examined by SEM, EDS, and electron probe micro-analyzer (EPMA) to observe the internal corrosion. The results demonstrate that the corrosion rate of the GH3625 alloy only slightly increased with increasing SO2 content in the acidic environment. A dense oxide film (primarily Cr2O3) forms on the alloy surface which can effectively prevent SO2 from diffusing into the interior of the alloy matrix. Additionally, chromium inside the matrix can combine with sulfur (primarily CrS) retarding corrosion. GH3625 alloy exhibits excellent corrosion resistance under an SO2 environment.