Super304H在模拟烟气环境下的腐蚀行为  

Study on corrosion behavior of Super304H steel in simulated furnace atmosphere

作　　者：李萍[1] 秦鹏[1] 庞胜娇[1] 赵杰[1] 李廷举[1] 

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116023

出　　处：《材料热处理学报》2015年第10期210-217,共8页Transactions of Materials and Heat Treatment

基　　金：自然科学基金联合基金项目重点项目(51134013);国家自然科学基金面上项目(51171037)

摘　　要：应用XRD、SEM(EDS)和EMPA等分析方法研究了预涂覆碱金属硫酸盐的Super304H在模拟烟气环境下的高温腐蚀特性。结果表明,Super304H在模拟气氛下的腐蚀动力学呈"抛物线"趋势递增;腐蚀产物由较多的富铁氧化物、部分Cr2O3以及少量尖晶石结构的复杂氧化物与Fe/Ni硫化物组成;SO2浓度的提高加速了合金的腐蚀,氧化膜明显增厚,与基体结合程度变差甚至剥离,腐蚀影响区孔隙密度增大,腐蚀深度增加。分析认为:Super304H在模拟烟气环境中的腐蚀归因于合金元素的氧化与硫化、三元共晶复合盐的形成以及金属(氧化物)在熔盐中的溶解。Corrosion behaviors of Super304 H steel pre-coated alkali metal sulphate in simulated furnace atmospheres containing different concentration of SO2 were investigated by means of XRD,SEM（ EDS） and EMPA. The results show that the corrosion kinetic curves of Super304 H steel in SO2 atmosphere follow the parabolic growth law. The corrosion products are composed of Fe oxides,Cr2O3,and minor compound oxides with spinel structure as well as（ Fe,Ni）xSy. With the increasing of SO2 volume fraction in the atmosphere,the corrosion of the alloy accelerates,and the oxide films in thickness increases significantly,moreover,the binding of the oxide films with the substrate becomes worse and the pore densities in the corrosion affected zone increase. It is concluded that the oxidation of the alloy,the formation of three-elements eutectic sulfate phase,and the solution of Fe in melted salt are all attributed to the corrosion of Super304 H steel in simulated furnace atmosphere.

关 键 词：超超临界燃煤发电 烟侧腐蚀 碱金属硫酸盐 低温热腐蚀 

分 类 号：TG142.73[一般工业技术—材料科学与工程]