弯曲变形304L不锈钢在高温碱盐环境中的腐蚀行为研究  

Study on the Corrosion Behavior of Bending Deformed 304L Stainless Steel in High-Temperature Alkali Salt Environment

作　　者：史建波 陈永康 朱周杰 林奕锦 周和荣[2,3] SHI Jianbo;CHEN Yongkang;ZHU Zhoujie;LIN Yijin;ZHOU Herong(Wuhan Wuguo Energy Engineering Co.,Ltd.,Wuhan 430205,China;Department of Materials Science,Wuhan University of Science and Technology,Wuhan 430081,China;State Key Laboratory of Refractory Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉武锅能源工程有限公司,湖北武汉430205 [2]武汉科技大学材料学部,湖北武汉430081 [3]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《材料保护》2024年第11期45-52,共8页Materials Protection

摘　　要：为探究弯曲变形不锈钢复合管在锅炉碱盐环境中的腐蚀行为及性能变化规律,通过对材料组织、结构及腐蚀产物形貌、组成等分析,研究了304L不锈钢在300℃含硫碱盐环境中的腐蚀行为,并重点分析了弯曲变形对304L不锈钢腐蚀性能的影响。结果表明:304L不锈钢在碱盐环境中试验48 h后表面腐蚀较轻微,腐蚀不均匀,腐蚀产物主要为Fe_(2)O_(3)、FeCr_(2)O_(4)和FeOOH,主要为元素铁和铬优先发生腐蚀;弯曲变形304L不锈钢腐蚀速率较大,腐蚀产物较厚,主要是弯曲变形使304L不锈钢小晶粒变形明显,位错和孪晶增加所致。For investigating the corrosion behavior and performance changes of bending deformation stainless steel composite pipes in boiler alkali salt environment,the corrosion behavior of 304L stainless steel in 300℃sulfur-containing alkali salt environment was studied through analyzing the material structure,morphology and composition of corrosion products,and the influence of bending deformation on the corrosion performance of 304L stainless steel was emphatically researched.Results showed that after 48 h of testing in alkaline salt environment,the surface corrosion of 304L stainless steel was relatively mild and uneven,and the main corrosion products were Fe_(2)O_(3),FeCr_(2)O_(4) and FeOOH,indicating that the corrosion primarily occurred on iron and chromium elements.Bent deformation of 304L stainless steel resulted in a higher corrosion rate and thicker corrosion products,mainly due to the significant deformation of small grains and an increase in dislocations and twinning caused by bending deformation.

关 键 词：304L不锈钢 碱性介质 弯曲变形 腐蚀行为 

分 类 号：TG172.6[金属学及工艺—金属表面处理]