摘要
研究了高温时效前后的 31 0不锈钢样品在气氛总压为 1 0 5Pa ,2 .3 %SO2 /S2 / 8.8%N2 气氛中 60 0℃下的高温硫腐蚀行为 .利用金相、扫描电镜 /能谱及X射线衍射等分析其腐蚀形貌、成分及结构 .结果表明 :经时效处理的 31 0不锈钢比未时效处理者腐蚀严重 ,前者以晶间腐蚀为主 ,后者以均匀腐蚀为主 .31 0不锈钢于 70 0℃ ,1 0 0 0 0h时效后在晶界大量析出σ相 ,使晶界附近贫Cr。
The sulfidation behavior of 310SS (Stainless Steel) before and affer high-temperature aging treatment has been studied in the gas mixture of 2.3%SO 2-S 2-8.8%N 2 under 10 5 Pa at 600℃.The morphology of corrosion products and scale structure were examined with OM,SEM/EDX and XRD.It is found that the aged sample suffered more severe corrosion than the unaged sample.Corrosion type of the aged 310SS is intergrainular,whereas corrosion type of unaged 310SS is uniform.The formation of σ phase due to aging treatment at 700℃ for 1000h,reduced Cr content on boundaries in 310SS,which results in the decrease of corrosion resistance of 310SS.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2002年第4期202-204,226,共4页
Corrosion Science and Protection Technology
