超级不锈钢254SMO在乙醇酸聚合过程中的腐蚀行为研究  

Study on Corrosion Behavior of Super Austenitic Stainless Steel 254SMO in Prepolymerization of Glycolide

作　　者：刘希武 李辉 LIU Xiwu;LI Hui(SEG Luoyang R&D Center of Technologies,Luoyang 471003,China;SINOPEC Anti-Corrosion Research Center of Petrochemical Equipment,Luoyang 471003,China)

机构地区：[1]中石化炼化工程集团洛阳技术研发中心,河南洛阳471003 [2]中国石油化工集团石化设备防腐蚀研究中心,河南洛阳471003

出　　处：《石油化工腐蚀与防护》2019年第5期9-12,共4页Corrosion & Protection In Petrochemical Industry

基　　金：中国石油化工股份有限公司科技开发项目“合成气制乙二醇系统腐蚀及材料优化研究”(315108)

摘　　要：乙交酯预聚反应过程中,因反应原料乙醇酸具有强腐蚀性,且物料组成和温度连续变化,极易造成装置的腐蚀失效。采用挂片浸泡法,研究了254SMO超级奥氏体不锈钢在典型乙交酯预聚反应体系与3种虚拟反应体系(密闭体系、敞口体系及抽真空体系)的腐蚀行为,并结合预聚产物的形态,探讨了典型反应体系腐蚀的影响因素及机理。研究结果表明:254SMO在典型乙交酯预聚反应体系下腐蚀并不严重,但在密闭体系和敞口体系中腐蚀极其严重;体系中的水含量是影响腐蚀的主要因素,抽真空能够去除体系中的水,可显著降低对材料的腐蚀。Corrosion failure of device was easily occurred during prepolymerization of Glycolide, because the raw material, glycolic acid, was highly corrosive, besides, both the composition and temperature changed continuously. Corrosion behavior of 254 SMO under typical system and three virtual systems, such as closed system, open system and vacuum system, were studied by immersion test. Combined with the prepolymer morphology, influence factors and corrosion mechanism were discussed. The results showed that the corrosion of 254 SMO was not serious under typical reaction system, but very serious in the closed system as well as the open system. Water content in the system was the main corrosion factor. Water can be removed by vacuum extraction, which can significantly reduce corrosion of the material.

关 键 词：乙醇酸 有机酸腐蚀 254SMO 乙交酯 

分 类 号：TG1[金属学及工艺—金属学]