SCR脱硝副产物硫酸氢铵对锅炉尾部金属材料的腐蚀特性研究
发布时间：2018-08-26 19:22
【摘要】：通过失重法研究了锅炉尾部材料碳钢和不锈钢在ABS(硫酸氢铵)和H_2SO_4两种溶液中的腐蚀行为,利用动电位极化曲线分析腐蚀特性。采用SEM/EDS和XPS表征手段分析了腐蚀产物表层的形貌和元素组成以及化合态。结果表明:不锈钢对ABS有更好的耐蚀性,且随着ABS溶液浓度的增大,腐蚀变剧烈。腐蚀产物的种类有Fe_2O_3,FeOOH,Fe_3O_4和铁的硫酸盐。碳钢和不锈钢在等浓度的ABS和硫酸溶液中腐蚀过程相似,说明ABS具有很强的腐蚀性。腐蚀机理为碳钢表面首先发生酸性腐蚀,H+作为去极化剂,有H_2析出。随着酸度的消耗,金属表面会发生氧腐蚀,溶解氧作为去极化剂。Fe~(2+)接着被进一步氧化为Fe~(3+),再发生一系列的次生反应,生成Fe的氧化物以及硫酸盐等。
[Abstract]:The corrosion behavior of carbon steel and stainless steel in ABS (ammonium sulfate) and H_2SO_4 solution was studied by weightlessness method. The corrosion characteristics were analyzed by potentiodynamic polarization curve. The surface morphology, elemental composition and chemical state of the corrosion products were characterized by SEM/EDS and XPS. The results show that stainless steel has better corrosion resistance to ABS and the corrosion becomes more severe with the increase of ABS solution concentration. Corrosion products include Fe_2O_3,FeOOH,Fe_3O_4 and iron sulfate. The corrosion process of carbon steel and stainless steel in the same concentration of ABS and sulfuric acid solution is similar, indicating that ABS is very corrosive. The corrosion mechanism is that acid corrosion H is the first depolarizing agent on the surface of carbon steel, and H _ 2 is precipitated. With the consumption of acidity, oxygen corrosion occurs on the metal surface. Dissolved oxygen as depolarizer. Fe2 is further oxidized to Fe~ (3), and then a series of secondary reactions occur to produce Fe oxides and sulfate.
【作者单位】： 华北电力大学环境科学与工程学院;国网河南省电力试验研究院;
【基金】：国网河南省电力公司电力科学研究院项目(SJTYHT/13-GS-178)资助
【分类号】：TK224.9
本文编号：2205915
[Abstract]:The corrosion behavior of carbon steel and stainless steel in ABS (ammonium sulfate) and H_2SO_4 solution was studied by weightlessness method. The corrosion characteristics were analyzed by potentiodynamic polarization curve. The surface morphology, elemental composition and chemical state of the corrosion products were characterized by SEM/EDS and XPS. The results show that stainless steel has better corrosion resistance to ABS and the corrosion becomes more severe with the increase of ABS solution concentration. Corrosion products include Fe_2O_3,FeOOH,Fe_3O_4 and iron sulfate. The corrosion process of carbon steel and stainless steel in the same concentration of ABS and sulfuric acid solution is similar, indicating that ABS is very corrosive. The corrosion mechanism is that acid corrosion H is the first depolarizing agent on the surface of carbon steel, and H _ 2 is precipitated. With the consumption of acidity, oxygen corrosion occurs on the metal surface. Dissolved oxygen as depolarizer. Fe2 is further oxidized to Fe~ (3), and then a series of secondary reactions occur to produce Fe oxides and sulfate.
【作者单位】： 华北电力大学环境科学与工程学院;国网河南省电力试验研究院;
【基金】：国网河南省电力公司电力科学研究院项目(SJTYHT/13-GS-178)资助
【分类号】：TK224.9
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