以80%Na2SO4+10%K2SO4+10%KCl混合熔融盐为热腐蚀介质,研究了TP310HCbN 奥氏体不锈耐热钢在600℃,650℃和700℃下的热腐蚀行为。结果表明:在600℃和650℃下,腐蚀失重轻微,热腐蚀过程中腐蚀产物从样品表面剥落,样品晶界发现大量硫化物,并有明显的晶间腐蚀倾向;在700℃下,样品失重加速,腐蚀产物剥落严重。利用XRD和SEM 分析样品经热腐蚀后的表面成分和结构,腐蚀产物主要由Fe3O4 和(Fe,Cr) 2O3 组成,并含有少量的NiCr2O4 和Cr2S3。

The hot corrosion behavior of TP310HCbN austenitic heat resistant stainless steel were studied in 80%Na2SO4 + 10%K2SO4 + 10%KCl molten salts at 600 ℃, 650 ℃ and 700 ℃, respectively. The result showed that when the samples were tested at 600 ℃ and 650 ℃ sulfides was detected at the grain boundaries of substrate, which manifested that intergranular corrosion was occurred. However, when the sample corroded at 700℃ the corrosion products spalled from sample surface on a large scale, which led to serious mass loss during the tests. The surface morphology, microstructures and composition of corroded samples were examined by SEM/EDS and XRD. The corroded products on the samples surface were mainly composed of Fe3O4 and(Fe,Cr)2O3 with small amount of NiCr2O4 and Cr2S3.